Exhibit 2.1

                          AGREEMENT AND PLAN OF MERGER



                                     BETWEEN


                     WEATHERFORD INTERNATIONAL INCORPORATED

                                       AND

                               ENTERRA CORPORATION


                                  JUNE 23, 1995








                                TABLE OF CONTENTS

ARTICLE I
THE MERGER..................................................................  1
    1.1    THE MERGER.......................................................  1
    1.2    CLOSING DATE.....................................................  1
    1.3    CONSUMMATION OF THE MERGER.......................................  2
    1.4    EFFECTS OF THE MERGER............................................  2
    1.5    CERTIFICATE OF INCORPORATION; BYLAWS.............................  2
    1.6    DIRECTORS AND OFFICERS...........................................  2
    1.7    CONVERSION OF SECURITIES; EXCHANGE; FRACTIONAL SHARES............  2
    1.8    TAKING OF NECESSARY ACTION; FURTHER ACTION.......................  4

ARTICLE II
REPRESENTATIONS AND WARRANTIES..............................................  4
    2.1    CERTAIN DEFINITIONS..............................................  4
    2.2    REPRESENTATIONS AND WARRANTIES OF WEATHERFORD....................  5
           (a)   ORGANIZATION AND COMPLIANCE WITH LAW.......................  5
           (b)   CAPITALIZATION.............................................  6
           (c)   AUTHORIZATION AND VALIDITY OF AGREEMENT....................  7
           (d)   NO APPROVALS OR NOTICES REQUIRED; NO CONFLICT WITH INSTRUMENTS
                 TO WHICH WEATHERFORD IS A PARTY............................  7
           (e)   COMMISSION FILINGS; FINANCIAL STATEMENTS...................  8
           (f)   CONDUCT OF BUSINESS IN THE ORDINARY COURSE; ABSENCE OF CERTAIN
                 CHANGES AND EVENTS.........................................  9
           (g)   CERTAIN FEES............................................... 10
           (h)   LITIGATION................................................. 10
           (i)   EMPLOYEE BENEFIT PLANS..................................... 10
           (j)   TAXES...................................................... 12
           (k)   ENVIRONMENTAL.............................................. 13
           (l)   NO SEVERANCE PAYMENTS...................................... 14
           (m)   VOTING REQUIREMENTS........................................ 14
           (n)   INSURANCE.................................................. 14
           (o)   TITLE TO PROPERTY.......................................... 14
           (p)   WEATHERFORD ACTIONS........................................ 14
    2.3    REPRESENTATIONS AND WARRANTIES OF ENTERRA........................ 14
           (a)   ORGANIZATION AND COMPLIANCE WITH LAW....................... 14
           (b)   CAPITALIZATION............................................. 15
           (c)   AUTHORIZATION AND VALIDITY OF AGREEMENT.................... 15
           (d)   NO APPROVALS OR NOTICES REQUIRED; NO CONFLICT WITH INSTRUMENTS
                 TO WHICH ENTERRA IS A PARTY................................ 16
           (e)   COMMISSION FILINGS; FINANCIAL STATEMENTS................... 16
           (f)   CONDUCT OF BUSINESS IN THE ORDINARY COURSE; ABSENCE OF CERTAIN
                 CHANGES AND EVENTS......................................... 18
           (g)   CERTAIN FEES............................................... 18
           (h)   LITIGATION................................................. 18


                                       -i-




           (i)   EMPLOYEE BENEFIT PLANS..................................... 19
           (j)   TAXES...................................................... 21
           (k)   ENVIRONMENTAL.............................................. 21
           (l)   NO SEVERANCE PAYMENTS...................................... 22
           (m)   VOTING REQUIREMENTS........................................ 22
           (n)   INSURANCE.................................................. 22
           (o)   TITLE TO PROPERTY.......................................... 22
           (p)   ENTERRA ACTIONS............................................ 22

ARTICLE III
COVENANTS OF WEATHERFORD PRIOR TO THE EFFECTIVE TIME........................ 23
    3.1    CONDUCT OF BUSINESS BY WEATHERFORD PENDING THE MERGER............ 23
    3.2    ACCESS TO INFORMATION............................................ 25
    3.3    AFFILIATES' AGREEMENTS........................................... 25
    3.4    RESERVATION OF WEATHERFORD COMMON STOCK.......................... 25
    3.5    STOCK EXCHANGE LISTING........................................... 25

ARTICLE IV
COVENANTS OF ENTERRA PRIOR TO THE EFFECTIVE TIME............................ 25
    4.1    CONDUCT OF BUSINESS BY ENTERRA PENDING THE MERGER................ 25
    4.2    ACCESS TO INFORMATION............................................ 27
    4.3    AFFILIATES' AGREEMENTS........................................... 27

ARTICLE V
ADDITIONAL AGREEMENTS....................................................... 28
    5.1    JOINT PROXY STATEMENT/PROSPECTUS; REGISTRATION STATEMENT......... 28
    5.2    COMFORT LETTERS.................................................. 28
    5.3    MEETINGS OF STOCKHOLDERS......................................... 28
    5.4    REASONABLE EFFORTS; CONSENTS, APPROVALS AND WAIVERS.............. 29
    5.5    ANTITRUST MATTERS................................................ 30
    5.6    NOTIFICATION OF CERTAIN MATTERS.................................. 30
    5.7    AGREEMENT TO DEFEND.............................................. 30
    5.8    EXPENSES......................................................... 30
    5.9    INDEMNIFICATION.................................................. 31
    5.10   POST-EFFECTIVE TIME MAILING...................................... 32
    5.11   STOCKHOLDERS' AGREEMENT.......................................... 32
    5.12   ENTERRA STOCK OPTIONS............................................ 32
    5.13   ENTERRA EMPLOYEE BENEFITS........................................ 33
    5.14   UPDATE OF DISCLOSURE LETTERS..................................... 34
    5.15   WEATHERFORD SPECIAL SEVERANCE PAY PLAN........................... 34
    5.16   CHANGE OF CONTROL AGREEMENTS..................................... 34
    5.17   INDEMNIFICATION AGREEMENTS....................................... 34
    5.18   ENTERRA EMPLOYEE BONUSES......................................... 35
    5.19   ENTERRA SEVERANCE AGREEMENTS..................................... 35
    5.20   ENTERRA CHAIRMAN, PRESIDENT AND CHIEF EXECUTIVE OFFICER.......... 36
    5.21   WEATHERFORD CHAIRMAN, PRESIDENT AND CHIEF EXECUTIVE OFFICER...... 36


                                      -ii-




    5.22   BOARD OF DIRECTORS............................................... 36



                                      -iii-






ARTICLE VI
CONDITIONS.................................................................. 37
    6.1    CONDITIONS TO OBLIGATIONS OF EACH PARTY TO EFFECT THE MERGER..... 37
    6.2    ADDITIONAL CONDITIONS TO OBLIGATIONS OF WEATHERFORD.............. 38
    6.3    ADDITIONAL CONDITIONS TO OBLIGATIONS OF ENTERRA.................. 40

ARTICLE VII
SPECIAL PROVISIONS AS TO CERTAIN MATTERS.................................... 41
    7.1    NO SOLICITATION BY WEATHERFORD................................... 41
    7.2    NO SOLICITATION BY ENTERRA....................................... 43
    7.3    FEE AND EXPENSE REIMBURSEMENTS................................... 45

ARTICLE VIII
MISCELLANEOUS............................................................... 46
    8.1    TERMINATION...................................................... 46
    8.2    EFFECT OF TERMINATION............................................ 47
    8.3    WAIVER AND AMENDMENT............................................. 48
    8.4    NONSURVIVAL OF REPRESENTATIONS, WARRANTIES, COVENANTS AND
           AGREEMENTS....................................................... 48
    8.5    PUBLIC STATEMENTS................................................ 48
    8.6    BINDING EFFECT; ASSIGNMENT....................................... 48
    8.7    NOTICES.......................................................... 48
    8.8    GOVERNING LAW; JURISDICTION...................................... 49
    8.9    SEVERABILITY..................................................... 50
    8.10   COUNTERPARTS..................................................... 50
    8.11   HEADINGS......................................................... 50
    8.12   ENTIRE AGREEMENT; THIRD PARTY BENEFICIARIES...................... 50



                                      -iv-








                          AGREEMENT AND PLAN OF MERGER

         This Agreement and Plan of Merger, dated as of the 23rd day of June,
1995 (the "Agreement"), is between Weatherford International Incorporated, a
Delaware corporation ("Weatherford"), and Enterra Corporation, a Delaware
corporation ("Enterra").

         WHEREAS, subject to and in accordance with the terms and conditions of
this Agreement, the respective Boards of Directors of Weatherford and Enterra
have approved the merger of Enterra with and into Weatherford (the "Merger"),
whereby each issued and outstanding share of common stock, par value $1.00 per
share, of Enterra ("Enterra Common Stock") not owned directly or indirectly by
Enterra or Weatherford will be converted into the right to receive common stock,
par value $.10 per share, of Weatherford ("Weatherford Common Stock"), as
provided herein;

         WHEREAS, for federal income tax purposes, it is intended that the
Merger shall qualify as a reorganization within the meaning of Section 368(a) of
the Internal Revenue Code of 1986, as amended (the "Code");

         WHEREAS, the Merger is intended to be treated as a "pooling of
interests" for accounting purposes; and

         WHEREAS, the parties hereto desire to set forth certain
representations, warranties and covenants made by each to the other as an
inducement to the consummation of the Merger;

         NOW, THEREFORE, in consideration of the premises and of the mutual
representations, warranties and covenants herein contained, the parties hereto
hereby agree as follows:

                                    ARTICLE I
                                   THE MERGER

         1.1 THE MERGER. Subject to and in accordance with the terms and
conditions of this Agreement and in accordance with the Delaware General
Corporation Law (the "DGCL"), at the Effective Time (as defined in Section 1.3)
Enterra will be merged with and into Weatherford. As a result of the Merger, the
separate corporate existence of Enterra shall cease and Weatherford shall
continue as the surviving corporation (sometimes referred to herein as the
"Surviving Corporation") and shall succeed to and assume all of the rights and
obligations of Enterra in accordance with the DGCL. The corporate name of the
Surviving Corporation shall be "Weatherford/Enterra, Inc.".

         1.2 CLOSING DATE. The closing of the transactions contemplated by this
Agreement (the "Closing") shall take place at the offices of Fulbright &
Jaworski L.L.P., 1301 McKinney, Suite 5100, Houston, Texas as soon as
practicable after the satisfaction or waiver of the conditions set forth in
Article VI or at such other time and place and on such other date as Weatherford
and Enterra shall agree; PROVIDED, that the closing conditions set forth in

                                       -1-







Article VI shall have been satisfied or waived at or prior to such time. The
date on which the Closing occurs is herein referred to as the "Closing Date".

         1.3 CONSUMMATION OF THE MERGER. As soon as practicable on the Closing
Date, the parties hereto will cause the Merger to be consummated by filing with
the Secretary of State of the State of Delaware a certificate of merger in such
form as required by, and executed in accordance with, the relevant provisions of
the DGCL. The "Effective Time" of the Merger as that term is used in this
Agreement shall mean the effective time set forth in the certified copy of the
certificate of merger issued by the Secretary of State of the State of Delaware
with respect to the Merger.

         1.4 EFFECTS OF THE MERGER.  The Merger shall have the effects set
forth in the applicable provisions of the DGCL.

         1.5 CERTIFICATE OF INCORPORATION; BYLAWS. The Restated Certificate of
Incorporation and bylaws of Weatherford, as in effect immediately prior to the
Effective Time, shall be the Certificate of Incorporation and bylaws of the
Surviving Corporation and thereafter shall continue to be its Certificate of
Incorporation and bylaws until amended as provided therein and under the DGCL;
PROVIDED, HOWEVER, that the Certificate of Incorporation of the Surviving
Corporation shall be amended as set forth on Exhibit 1.5.


         1.6 DIRECTORS AND OFFICERS.

                  (a) The Board of Directors of the Surviving Corporation shall
        consist of ten persons. Exhibit 1.6(a) sets forth the initial directors
        of the Surviving Corporation, along with the term of office for, and
        the committee or committees of the Board of Directors, if any, on,
        which each such director shall serve.

                  (b) Exhibit 1.6(b) sets forth the initial officers of the
        Surviving Corporation, each of whom shall hold office until his or her
        successor is duly elected or appointed and qualified.

        1.7 CONVERSION OF SECURITIES; EXCHANGE; FRACTIONAL SHARES. Subject to
the terms and conditions of this Agreement, at the Effective Time, by virtue of
the Merger and without any action on the part of Weatherford, Enterra or their
stockholders:

                  (a) Each share of Enterra Common Stock issued and outstanding
        immediately prior to the Effective Time (the "Shares"), other than any
        Shares to be canceled pursuant to Section 1.7(b), shall be converted,
        subject to the provisions of this Section 1.7, into the right to
        receive 0.845 of a share (which number reflects a 1 for 2 reverse stock
        split to be effected at the Closing) of Weatherford Common Stock (the
        "Conversion Rate"); PROVIDED, HOWEVER, that no fractional shares of
        Weatherford Common Stock shall be issued, and, in lieu thereof, a cash
        payment shall be made pursuant to Section 1.7(f) hereof.


                                       -2-





                  (b) Each share of Enterra Common Stock held in the treasury of
         Enterra and each Share owned by Weatherford or any direct or indirect
         wholly-owned subsidiary of Enterra or of Weatherford immediately prior
         to the Effective Time shall be canceled and extinguished at the
         Effective Time without any conversion thereof and no payment shall be
         made with respect thereto.

                  (c) As soon as practicable after the Effective Time, each
         holder of an outstanding certificate that prior thereto represented
         Shares shall be entitled, upon surrender thereof to the transfer agent
         for the Weatherford Common Stock, to receive in exchange therefor a
         certificate or certificates representing the number of whole shares of
         Weatherford Common Stock into which the Shares so surrendered shall
         have been converted as aforesaid, of such denominations and registered
         in such names as such holder may request. Each holder of Shares who
         would otherwise be entitled to a fraction of a share of Weatherford
         Common Stock shall, upon surrender of the certificates representing
         Shares held by such holder to Weatherford's transfer agent, be paid an
         amount in cash in accordance with the provisions of Section 1.7(f).
         Until so surrendered, each outstanding certificate that, prior to the
         Effective Time, represented Shares shall be deemed from and after the
         Effective Time, for all corporate purposes, other than the payment of
         earlier dividends and distributions, to evidence the ownership of the
         number of full shares of Weatherford Common Stock into which such
         Shares shall have been converted pursuant to this Section 1.7. Unless
         and until any such outstanding certificates shall be surrendered, no
         dividends or other distributions payable to the holders of Weatherford
         Common Stock, as of any time on or after the Effective Time, shall be
         paid to the holders of such outstanding certificates that prior to the
         Effective Time represented Shares; PROVIDED, HOWEVER, that, upon
         surrender and exchange of such outstanding certificates, there shall
         be paid to the record holders of the certificates issued and exchanged
         therefor the amount, without interest thereon, of dividends and other
         distributions, if any, that theretofore were declared and became
         payable since the Effective Time with respect to the number of full
         shares of Weatherford Common Stock issued to such holders.

                  (d) All shares of Weatherford Common Stock into which the
         Shares shall have been converted pursuant to this Section 1.7 shall be
         issued in full satisfaction of all rights pertaining to such converted
         Shares.

                  (e) If any certificate for shares of Weatherford Common Stock
         is to be issued in a name other than that in which the certificate
         surrendered in exchange therefor is registered, it shall be a condition
         of the issuance thereof that the certificate so surrendered shall be
         properly endorsed and otherwise in proper form for transfer and that
         the person requesting such exchange shall have paid to Weatherford or
         its transfer agent any transfer or other taxes required by reason of
         the issuance of a certificate for shares of Weatherford Common Stock in
         any name other than that of the registered holder of the certificate
         surrendered, or established to the satisfaction of Weatherford or its
         transfer agent that such tax has been paid or is not payable.


                                       -3-




                  (f)      No fraction of a share of Weatherford Common Stock
         shall be issued, but in lieu thereof each holder of Shares who would
         otherwise be entitled to a fraction of a share of Weatherford Common
         Stock shall, upon surrender of the Shares held by such holder to
         Weatherford's transfer agent, be paid an amount in cash equal to the
         value of such fraction of a share based upon the closing price of
         Weatherford Common Stock on the New York Stock Exchange on the last
         trading day prior to the Effective Time. No interest shall be paid on
         such amount. All Shares held by a record holder other than nominee
         holders shall be aggregated for purposes of computing the number of
         shares of Weatherford Common Stock to be issued pursuant to this
         Section 1.7.

                  (g) None of Weatherford, Enterra, the Surviving Corporation or
         Weatherford's transfer agent shall be liable to a holder of the Shares
         for any amount properly paid to a public official pursuant to
         applicable property, escheat or similar law.

         1.8 TAKING OF NECESSARY ACTION; FURTHER ACTION. The parties hereto
shall take all such reasonable and lawful action as may be necessary or
appropriate to effectuate the Merger as promptly as possible. If, at any time
after the Effective Time, any such further action is necessary or desirable to
carry out the purposes of this Agreement and to vest the Surviving Corporation
with full right, title and possession to all assets, property, rights,
privileges, powers and franchises of Weatherford and Enterra, such corporations
shall direct their respective officers and directors to take all such lawful and
necessary action.

                                   ARTICLE II
                         REPRESENTATIONS AND WARRANTIES

         2.1 CERTAIN DEFINITIONS.  As used in this Agreement, the following
terms shall have the meanings ascribed to them below:

                  (a) "Environmental Laws" shall mean all United States or
         foreign federal, state, local or municipal laws, rules, regulations,
         statutes, ordinances or orders of any governmental entity relating to
         (i) the control of any potential pollutant or protection of the air,
         water or land, (ii) solid, gaseous or liquid waste generation,
         handling, treatment, storage, disposal or transportation, and (iii)
         exposure to hazardous, toxic or other substances alleged to be harmful.
         The term "Environmental Laws" shall include, but not be limited to, the
         Clean Air Act, 42 U.S.C. Section 7401 et seq., the Clean Water Act, 33
         U.S.C. Section 1251 et seq., the Resource Conservation and Recovery
         Act, 42 U.S.C. Section 6901, et seq., the Toxic Substances Control Act,
         15 U.S.C. Section 2601 et seq., the Safe Drinking Water Act, 42 U.S.C.
         Section 300f et seq. and the Comprehensive Environmental Response,
         Compensation an Liability Act ("CERCLA"), 42 U.S.C. Section 9601 et
         seq.

                 (b) "Environmental Permit" shall mean any permit, license,
         approval, registration, identification number or other authorization
         with respect to any business or other operations conducted by
         Weatherford or any Weatherford Subsidiary (as defined in Section 2.2(a)
         or Enterra or any Enterra Subsidiary (as defined in Section 2.3(a)),
         as the case may be, required under any applicable Environmental Law.


                                           -4-







                  (c) "Hazardous Materials" shall mean any (i) petroleum or
         petroleum products, (ii) hazardous substance as defined pursuant to
         Section 101(14) of CERCLA or (iii) any other chemical, substance or
         waste that is regulated under any Environmental Law.

                  (d) "Material Adverse Change" with respect to any party shall
         mean a material adverse change in the business, financial condition or
         results of operations of such party and its subsidiaries, taken as a
         whole; PROVIDED, HOWEVER, that in no event shall the term "Material
         Adverse Change" be deemed to include (i) changes in national or
         international economic conditions or industry conditions generally,
         (ii) changes, or possible changes, in foreign, federal, state or local
         statutes and regulations applicable to Weatherford or Enterra, as the
         case may be, or (iii) the loss of employees, customers or suppliers by
         such party as a direct or indirect consequence of any announcement
         relating to the Merger.

                  (e) "Material Adverse Effect" on any party shall mean any
         material adverse effect on the business, financial condition or results
         of operations of such party and its subsidiaries, taken as a whole;
         PROVIDED, HOWEVER, that in no event shall the term "Material Adverse
         Effect" be deemed to include (i) changes in national or international
         economic conditions or industry conditions generally, (ii) changes, or
         possible changes, in foreign, federal, state or local statutes and
         regulations applicable to Weatherford or Enterra, as the case may be,
         or (iii) the loss of employees, customers or suppliers by such party as
         a direct or indirect consequence of any announcement relating to the
         Merger.

                  (f) "Permitted Liens" shall mean: (i) liens for taxes not due
         and payable or which are being contested in good faith, (ii)
         mechanics', warehousemen's and other statutory liens incurred in the
         ordinary course of business and (iii) defects and irregularities in
         title and encumbrances that are not substantial in character or amount
         and do not materially impair the use of the property or asset in
         question.

         2.2 REPRESENTATIONS AND WARRANTIES OF WEATHERFORD. Weatherford hereby
represents and warrants to Enterra that, except as expressly contemplated by
this Agreement or as set forth in the disclosure letter delivered by Weatherford
to Enterra on the date hereof (the "Weatherford Disclosure Letter"):

                  (a) ORGANIZATION AND COMPLIANCE WITH LAW. Weatherford and each
         of its corporate subsidiaries (the "Weatherford Subsidiaries") is a
         corporation duly organized, validly existing and in good standing under
         the laws of the jurisdiction in which it is organized and has all
         requisite corporate power and authority and all necessary governmental
         authorizations to own, lease and operate all of its properties and
         assets and to carry on its business as now being conducted, except
         where the failure to do so would not, either individually or in the
         aggregate, have a Material Adverse Effect. Weatherford and each of the
         Weatherford Subsidiaries is duly qualified as a foreign corporation to
         do business, and is in good standing, in each jurisdiction in which the
         property owned, leased or operated by it or the nature of the business
         conducted by


                                       -5-






         it makes such qualification necessary, except in such jurisdictions
         where the failure to do so does not and would not, either individually
         or in the aggregate, have a Material Adverse Effect. Weatherford and
         each of the Weatherford Subsidiaries is in compliance with all
         applicable laws, judgments, orders, rules and regulations, domestic and
         foreign, except where failure to be in such compliance would not,
         either individually or in the aggregate, have a Material Adverse
         Effect. Weatherford has heretofore delivered to Enterra true and
         complete copies of Weatherford's Restated Certificate of Incorporation
         and bylaws, as in existence on the date hereof.

                  (b)      CAPITALIZATION.

                           (i) The authorized capital stock of Weatherford
                  consists of 80,000,000 shares of Weatherford Common Stock, par
                  value $.10 per share, and 1,000,000 shares of preferred stock,
                  par value $1.00 per share. As of June 21, 1995, there were
                  issued and outstanding 54,276,632 shares of Weatherford Common
                  Stock (including shares deemed to be outstanding pending the
                  exchange of shares of common stock of Petroleum Equipment
                  Tools Co. and H&H Oil Tool Co., Inc.) and no shares of
                  preferred stock, and 111,043 shares of Weatherford Common
                  Stock were held as treasury shares, of which 82,783 shares
                  were reserved for issuance pursuant to various stock option
                  agreements. As of June 21, 1995, there were reserved for
                  issuance 2,299,414 shares of Weatherford Common Stock pursuant
                  to stock option, employee stock purchase, 401(k) savings,
                  stock incentive and restricted stock plans (collectively, the
                  "Weatherford Options"). All issued shares of Weatherford
                  Common Stock are validly issued, fully paid and nonassessable
                  and no holder thereof is entitled to preemptive rights.
                  Weatherford is not a party to, and, excluding agreements among
                  various funds held or managed by institutional investors, has
                  no knowledge of, any voting agreement, voting trust or similar
                  agreement or arrangement relating to any class or series of
                  its capital stock, or any agreement or arrangement providing
                  for registration rights with respect to any capital stock or
                  other securities of Weatherford. All shares of Weatherford
                  Common Stock to be issued pursuant to the Merger, when issued
                  in accordance with this Agreement, will be validly issued,
                  fully paid and nonassessable and will not violate the
                  preemptive rights of any person. All outstanding shares of
                  capital stock of the Weatherford Subsidiaries are owned by
                  Weatherford, free and clear of all liens, charges,
                  encumbrances, adverse claims and options of any nature;
                  provided, however, that Weatherford's ownership of shares of
                  capital stock of certain foreign Weatherford Subsidiaries may
                  be subject to Permitted Liens.

                           (ii) Other than as set forth in this Section 2.2(b)
                  and as contemplated by Section 3.1(b)(iii), there are not now,
                  and at the Effective Time there will not be, any (A) shares of
                  capital stock or other equity securities of Weatherford
                  outstanding (other than Weatherford Common Stock issued
                  pursuant to Weatherford Options as described herein) or
                  (B) outstanding options, warrants, scrip, rights to subscribe
                  for, calls or commitments of any character whatsoever relating
                  to, or securities or rights convertible into or exchangeable
                  for, shares of


                                       -6-



                any class of capital stock of Weatherford, or contracts,
                understandings or arrangements to which Weatherford is a
                party, or by which it is or may be bound, to issue additional
                shares of its capital stock or options, warrants, scrip or
                rights to subscribe for, or securities or rights convertible
                into or exchangeable for, any additional shares of its capital
                stock.


                  (c) AUTHORIZATION AND VALIDITY OF AGREEMENT. Weatherford has
         all requisite corporate power and authority to enter into this
         Agreement and to perform its obligations hereunder. The execution and
         delivery by Weatherford of this Agreement and the consummation by it of
         the transactions contemplated hereby have been duly authorized by all
         necessary corporate action (subject only, with respect to the Merger,
         to adoption and approval of this Agreement by the stockholders of
         Weatherford as provided in Section 5.3(b). This Agreement has been duly
         executed and delivered by Weatherford and is the valid and binding
         obligation of Weatherford, enforceable against Weatherford in
         accordance with its terms, except as such enforceability may be limited
         or affected by (i) bankruptcy, insolvency, reorganization, moratorium,
         liquidation, arrangement, fraudulent transfer, fraudulent conveyance
         and other similar laws (including, without limitation, court decisions)
         now or hereafter in effect and affecting the rights and remedies of
         creditors generally or providing for the relief of debtors, (ii) the
         refusal of a particular court to grant equitable remedies, including,
         without limitation, specific performance and injunctive relief, and
         (iii) general principles of equity (regardless of whether such remedies
         are sought in a proceeding in equity or at law) and except as the
         enforceability of any indemnification provision contained in this
         Agreement may be limited by applicable federal or state securities
         laws.

                  (d) NO APPROVALS OR NOTICES REQUIRED; NO CONFLICT WITH
         INSTRUMENTS TO WHICH WEATHERFORD IS A PARTY. Neither the execution and
         delivery of this Agreement nor the performance by Weatherford of its
         obligations hereunder, nor the consummation of the transactions
         contemplated hereby by Weatherford, will (i) conflict with
         Weatherford's Restated Certificate of Incorporation or bylaws; (ii)
         assuming satisfaction of the requirements set forth in clause (iii)
         below, violate any provision of law applicable to Weatherford; (iii)
         except for (A) requirements of Federal and state securities law, (B)
         requirements arising out of the Hart-Scott-Rodino Antitrust
         Improvements Act of 1976 (the "HSR Act"), (C) requirements of filings
         in such foreign jurisdictions as may be applicable and (D) the filing
         of a certificate of merger in accordance with the DGCL, require any
         consent or approval of, or filing with or notice to, any public body or
         authority, domestic or foreign, under any provision of law applicable
         to Weatherford; or (iv) require any consent, approval or notice under,
         or violate, breach, be in conflict with or constitute a default (or an
         event that, with notice or lapse of time or both, would constitute a
         default) under, or permit the termination of any provision of, or
         result in the creation or imposition of any lien upon any properties,
         assets or business of Weatherford under, any note, bond, indenture,
         mortgage, deed of trust, lease, franchise, permit, authorization,
         license, contract, instrument or other agreement or commitment or any
         order, judgment or decree to which Weatherford is a party or by which
         Weatherford or its assets or properties is bound or encumbered, except
         those that have already been given, obtained or filed and except in any
         of the cases



                                       -7-




         enumerated in clauses (ii) through (iv), those that, in the aggregate,
         would not have a Material Adverse Effect.

                  (e) COMMISSION FILINGS; FINANCIAL STATEMENTS. Since January 1,
         1992, Weatherford and each of the Weatherford Subsidiaries have filed
         all reports, registration statements and other filings, together with
         any amendments required to be made with respect thereto, that they have
         been required to file with the Securities and Exchange Commission (the
         "Commission") under the Securities Act of 1933, as amended (the
         "Securities Act"), and the Securities Exchange Act of 1934, as amended
         (the "Exchange Act"). All reports, registration statements and other
         filings (including, without limitation, all notes, exhibits and
         schedules thereto and documents incorporated by reference therein)
         filed by Weatherford with the Commission since January 1, 1992 through
         the date of this Agreement, together with any amendments thereto, are
         sometimes collectively referred to as the "Weatherford Commission
         Filings". Weatherford has heretofore delivered to Enterra copies of the
         Weatherford Commission Filings. As of the effectiveness dates declared
         by the Commission, in the case of registration statements, as of the
         mailing dates, in the case of proxy statements, or as of the filing
         dates with the Commission, in the case of all other Weatherford
         Commission Filings, the Weatherford Commission Filings complied, and
         the Proxy Statement (as defined in Section 5.1) and the Registration
         Statement (as defined in Section 5.1) (except with respect to
         information concerning Enterra and the Enterra Subsidiaries furnished
         by or on behalf of Enterra to Weatherford specifically for use therein)
         will comply, in all material respects with the Securities Act, the
         Exchange Act and the rules and regulations of the Commission
         promulgated thereunder, as applicable, and did not or will not, as the
         case may be, contain any untrue statement of a material fact or omit to
         state a material fact required to be stated therein or necessary to
         make the statements made therein, in light of the circumstances under
         which they were made, not misleading.

                  All material contracts of Weatherford and the Weatherford
         Subsidiaries have been included in the Weatherford Commission Filings,
         except for those contracts not required to be filed pursuant to the
         rules and regulations of the Commission.

                  Each of the audited consolidated financial statements
         (including, without limitation, any related notes or schedules)
         included or incorporated by reference in the Weatherford Commission
         Filings was, and each of the audited consolidated financial statements
         to be included or incorporated by reference in the Proxy Statement and
         the Registration Statement (except for those financial statements of
         Enterra and the Enterra Subsidiaries furnished by or on behalf of
         Enterra to Weatherford specifically for use therein) will be, prepared
         in accordance with generally accepted accounting principles applied on
         a consistent basis (except as may be noted therein or in the notes or
         schedules thereto), and fairly presents, or will fairly present, as the
         case may be, in all material respects, the consolidated financial
         position of Weatherford and the Weatherford Subsidiaries as of the
         dates thereof and the statements of income, cash flows and
         stockholders' equity for the periods then ended in accordance with
         generally accepted accounting principles. Each of the unaudited interim
         financial statements



                                       -8-





         included or incorporated by reference in the Weatherford Commission
         Filings was, and each of the unaudited consolidated financial
         statements to be included or incorporated by reference in the Proxy
         Statement and the Registration Statement (except for those financial
         statements of Enterra and the Enterra Subsidiaries furnished by or on
         behalf of Enterra to Weatherford specifically for use therein) will be,
         prepared in a manner consistent with the audited consolidated financial
         statements and generally accepted accounting principles. As of the date
         hereof, Weatherford has no material liabilities, absolute or
         contingent, not reflected in the Weatherford Commission Filings, except
         (i) liabilities not required under generally accepted accounting
         principles to be reflected on such financial statements or the notes
         thereto and (ii) liabilities incurred in the ordinary course of
         business since the date of such financial statements consistent with
         past operations and not relating to the borrowing of money.

                  (f) CONDUCT OF BUSINESS IN THE ORDINARY COURSE; ABSENCE OF
         CERTAIN CHANGES AND EVENTS. Since April 1, 1995, except as disclosed in
         the Weatherford Commission Filings filed with the Commission since that
         date, Weatherford and the Weatherford Subsidiaries have conducted their
         business only in the ordinary and usual course, and there has not been
         (i) any Material Adverse Change in Weatherford or any condition, event
         or development that reasonably may be expected to result in any
         Material Adverse Change; (ii) any change by Weatherford in its
         accounting methods, principles or practices; (iii) any revaluation by
         Weatherford or any of the Weatherford Subsidiaries of any of its or
         their assets, including, without limitation, writing down the value of
         inventory or writing off notes or accounts receivable other than in the
         ordinary course of business; (iv) any entry by Weatherford or any of
         the Weatherford Subsidiaries into any commitment or transaction
         material to Weatherford and the Weatherford Subsidiaries, taken as a
         whole, other than in the ordinary course of business; (v) any
         declaration, setting aside or payment of any dividends or distributions
         in respect of the Weatherford Common Stock, or any redemption, purchase
         or other acquisition of any of its securities or any securities of any
         of the Weatherford Subsidiaries; (vi) any damage, destruction or loss
         (whether or not covered by insurance) materially adversely affecting
         the properties or business of Weatherford and the Weatherford
         Subsidiaries, taken as a whole; (vii) any increase in indebtedness for
         borrowed money; (viii) any granting of a security interest or lien on
         any property or assets of Weatherford and the Weatherford Subsidiaries,
         other than Permitted Liens; or (ix) any increase in or establishment of
         any bonus, insurance, severance, deferred compensation, pension,
         retirement, profit sharing, stock option (including, without
         limitation, the granting of stock options, stock appreciation rights,
         performance awards or restricted stock awards), stock purchase or other
         employee benefit plan or any other increase in the compensation payable
         or to become payable to any officers or key employees of Weatherford or
         any of the Weatherford Subsidiaries.

                  (g) CERTAIN FEES. Neither Weatherford nor any of its officers,
         directors or employees, on behalf of Weatherford or any of the
         Weatherford Subsidiaries or its or their respective Boards of Directors
         (or any committee thereof), has employed any financial advisor, broker
         or finder or incurred any liability for any financial advisory,


                                       -9-





         brokerage or finders' fees or commissions in connection with the
         transactions contemplated hereby.

                  (h) LITIGATION. Except as disclosed in the Weatherford
         Commission Filings, there are no claims, actions, suits, investigations
         or proceedings pending or, to the knowledge of Weatherford, threatened
         against or affecting Weatherford or any of the Weatherford Subsidiaries
         or any of their respective properties at law or in equity, or any of
         their respective employee benefit plans or fiduciaries of such plans,
         or before or by any federal, state, municipal or other governmental
         agency or authority, or before any arbitration board or panel, wherever
         located, that, individually or in the aggregate, if adversely
         determined would have a Material Adverse Effect, or that involve the
         risk of criminal liability.

                 (i) EMPLOYEE BENEFIT PLANS.  The Weatherford Disclosure Letter
         sets forth a complete and accurate list of:

                           (i) each "employee welfare benefit plan" (as such
                  term is defined in Section 3(1) of the Employee Retirement
                  Income Security Act of 1974, as amended ("ERISA")) (the
                  "Weatherford Welfare Plans");

                           (ii) each "employee pension benefit plan" (as
                  such term is defined in Section 3(2) of ERISA) (the
                  "Weatherford Pension Plans"); and

                           (iii) all other employee benefit agreements or
                  arrangements, including, without limitation, deferred
                  compensation plans, incentive plans, bonus plans or
                  arrangements, stock option plans, stock purchase plans, golden
                  parachute agreements, severance pay plans, dependent care
                  plans, cafeteria plans, employee assistance programs,
                  scholarship programs, employment contracts and other similar
                  plans, agreements and arrangements (collectively, with the
                  Weatherford Welfare Plans and the Weatherford Pension Plans,
                  the "Weatherford Benefit Plans"),

         that are currently in effect or were maintained within three years of
         the Closing Date, or have been approved before this date but are not
         yet effective, for the benefit of directors, officers, employees or
         former employees (or their beneficiaries) of Weatherford, any of the
         Weatherford Subsidiaries incorporated in the United States (the
         "Weatherford U.S. Subsidiaries") or any member of a controlled group or
         affiliated service group (as defined in Section 414(b), (c), (m) or (o)
         of the Code) that is incorporated or domiciled in the United States of
         which Weatherford or any of the Weatherford U.S. Subsidiaries is a
         member (collectively, the "Weatherford Group"). Weatherford and the
         Weatherford U.S. Subsidiaries will provide to Enterra, as to each
         Weatherford Benefit Plan, as applicable, access to a complete and
         accurate copy of (i) such plan, agreement or arrangement; (ii) the
         trust, group annuity contract or other document that provides the
         funding for such plan; (iii) the most recent annual Form 5500, 990 and
         1041 reports; (iv) the most recent actuarial report or valuation
         statement; (v) the most current summary plan description, handbook or
         other booklet


                                      -10-







         that describes any Weatherford Benefit Plan, and any summary of
         material modifications prepared after each such summary plan
         description; (vi) the most recent Internal Revenue Service ("IRS")
         determination letter and all rulings or determinations requested from
         the IRS subsequent to the date of such determination letter; and (vii)
         all other pending correspondence from the IRS or the Department of
         Labor received by any member of the Weatherford Group that relates to
         such plan.

                  Each Weatherford Welfare Plan and Weatherford Pension Plan (i)
         is in compliance with ERISA, including, without limitation, all
         reporting and disclosure requirements of Part 1 of Subtitle B of Title
         I of ERISA, except where the failure to be in compliance would not,
         either individually or in the aggregate, have a Material Adverse
         Effect; (ii) is in compliance with the Code, except where the failure
         to be in compliance would not, either individually or in the aggregate,
         have a Material Adverse Effect; (iii) has had the appropriate Form 5500
         timely filed for any Weatherford Pension Plan, if applicable, for each
         year of its existence and for any Weatherford Welfare Plan for each
         year of its existence after 1987, except where the failure to cause
         such timely filing would not, either individually or in the aggregate,
         have a Material Adverse Effect; (iv) has not engaged in any transaction
         described in Section 406 or 407 of ERISA or Section 4975 of the Code
         unless it received or is entitled to an exemption under Section 408 of
         ERISA or Section 4975 of the Code, as applicable, or unless such
         transaction has been corrected and all applicable excise taxes paid or
         waived; (v) has no issue pending (other than the payment of benefits in
         the normal course or the qualification of the plan pursuant to an
         application pending before the IRS) nor any issue resolved adversely to
         the Weatherford Group that, in either case, may subject the Weatherford
         Group to the payment of a penalty, interest, tax or other amount,
         which, either individually or in the aggregate, would have a Material
         Adverse Effect; and (vi) can be unilaterally terminated or amended on
         no more than 90 days notice. No notice has been received by the
         Weatherford Group of an increase or proposed increase in any premium
         relative to any Weatherford Benefit Plan, and no amendment to any
         Weatherford Benefit Plan within the last twelve months has increased
         the rate of employer contributions thereunder that, either individually
         or in the aggregate, would have a Material Adverse Effect.

                  Each Weatherford Benefit Plan that is intended to be a
         voluntary employee benefit association has been submitted to and
         approved by the IRS as exempt from federal income tax under Section
         501(c)(9) of the Code or the applicable submission period relating to
         any such plan will not have ended prior to the Closing. No Weatherford
         Benefit Plan will cause the Weatherford Group to have liability for
         severance pay as a result of this Agreement. The Weatherford Group does
         not provide employee post-retirement medical or health coverage or
         contribute to or maintain any employee welfare benefit plan that
         provides for health benefit coverage following termination of
         employment except as required by Section 4980B(f) of the Code or other
         applicable statute, nor has the Weatherford Group made any
         representations, agreements, covenants or commitments to provide that
         coverage.


                                      -11-





                  Except for each Weatherford Pension Plan that is an ERISA
         top-hat plan, each Weatherford Pension Plan has been submitted to and
         approved as qualifying under Section 401(a) of the Code by the IRS or
         the applicable remedial amendment period relating to such plan will not
         have ended prior to the Closing. To the knowledge of Weatherford, no
         facts have occurred that, if known by the IRS, could cause
         disqualification of any Weatherford Pension Plan. Each Weatherford
         Pension Plan to which Section 412 of the Code is applicable fully
         complies with the funding requirements of that Section and there is no
         accumulated funding deficiency as defined in Section 302(a)(2) of ERISA
         (whether or not waived) in any such plan. The Weatherford Group has
         paid all premiums (including, without limitation, interest, charges and
         penalties for late payment) due the Pension Benefit Guaranty
         Corporation (the "PBGC") with respect to each Weatherford Pension Plan
         for which premiums are required. No Weatherford Pension Plan has been
         terminated under circumstances that would result in liability to the
         PBGC or the Weatherford Group. There has been no "reportable event" (as
         defined in Section 4043(b) of ERISA and the regulations under that
         Section) with respect to any Weatherford Pension Plan subject to Title
         IV of ERISA. With respect to each Weatherford Pension Plan subject to
         Title IV of ERISA, the Weatherford Group has not (i) ceased operations
         at a facility so as to become subject to the provisions of Section
         4062(e) of ERISA, (ii) withdrawn as a substantial employer so as to
         become subject to the provisions of Section 4063 of ERISA or (iii)
         ceased making contributions on or before the Closing Date to any such
         plan subject to Section 4064(a) of ERISA to which the Weatherford Group
         made contributions at any time during the six years prior to the
         Closing Date. Neither the Weatherford Group nor any member thereof has
         made a complete or partial withdrawal from a multiemployer plan (as
         defined in Section 3(37) of ERISA) so as to incur withdrawal liability
         as defined in Section 4201 of ERISA.

                  Weatherford's subsidiaries incorporated outside of the United
         States and any benefit plans maintained by any of them for the benefit
         of their directors, officers, employees or former employees (or any of
         their beneficiaries) are in compliance with applicable laws pertaining
         to such plans in the jurisdictions of such subsidiaries, except where
         such failure to be in compliance would not, either individually or in
         the aggregate, have a Material Adverse Effect.

                  (j) TAXES. All returns and reports, including, without
         limitation, information and withholding returns and reports ("Tax
         Returns") of or relating to any foreign, federal, state or local tax,
         assessment or other governmental charge ("Taxes" or a "Tax") that are
         required to be filed on or before the Closing Date by or with respect
         to Weatherford or any of the Weatherford Subsidiaries have been or will
         be duly and timely filed, and all Taxes, including, without limitation,
         interest and penalties, due and payable pursuant to such Tax Returns
         have been paid or adequately provided for in reserves established by
         Weatherford, except where the failure to file, pay or provide for would
         not, either individually or in the aggregate, have a Material Adverse
         Effect. All Tax Returns of or with respect to Weatherford or any of the
         Weatherford Subsidiaries have been audited by the applicable
         governmental authority, or the applicable statute of limitations has
         expired, for all periods up to and including, without limitation, the




                                      -12-




         tax year ended December 31, 1987. There is no material claim
         against Weatherford or any of the Weatherford Subsidiaries with respect
         to any Taxes, and no material assessment, deficiency or adjustment has
         been asserted or proposed with respect to any Tax Return of or with
         respect to Weatherford or any of the Weatherford Subsidiaries that has
         not been adequately provided for in reserves established by
         Weatherford. The total amounts set up as liabilities for current and
         deferred Taxes in the consolidated financial statements included in the
         Weatherford Commission Filings have been prepared in accordance with
         generally accepted accounting principles and are sufficient to cover
         the payment of all material Taxes, including, without limitation, any
         penalties or interest thereon and whether or not assessed or disputed,
         that are, or are hereafter finally determined to be, or to have been,
         due with respect to the operations of Weatherford and the Weatherford
         Subsidiaries through the periods covered thereby.

                 (k) ENVIRONMENTAL.

                          (i) There are no facts, conditions or circumstances
                  known to Weatherford that could cause Weatherford or any
                  Weatherford Subsidiary to incur any loss, liability, damage,
                  cost or expense, either individually or in the aggregate, in
                  excess of Weatherford's charges, accruals and reserves for
                  environmental matters reflected on Weatherford's consolidated
                  balance sheet contained in the most recent Weatherford
                  Commission Filing, for (A) violations of Environmental Laws,
                  (B) failure to obtain an Environmental Permit, (C) a
                  requirement to install environmental or pollution control
                  equipment, (D) removal, response or remedial costs related to
                  Hazardous Materials or (E) personal injury, property damage or
                  natural resources damage resulting from exposure to or
                  releases of Hazardous Materials, except in each case where
                  such loss, liability, damage, cost or expense would not have a
                  Material Adverse Effect.

                           (ii) The business and any other operations conducted
                  by Weatherford or any Weatherford Subsidiary are in compliance
                  with all applicable limitations, restrictions, conditions,
                  standards, prohibitions, requirements and obligations
                  established under applicable Environmental Laws, except where
                  the failure to be in compliance would not, either individually
                  or in the aggregate, have a Material Adverse Effect.

                  (l) NO SEVERANCE PAYMENTS. None of Weatherford or the
         Weatherford Subsidiaries will owe a severance payment or similar
         obligation to any of their respective employees, officers or directors
         as a result of the Merger or the transactions contemplated by this
         Agreement, nor will any of such persons be entitled to an increase in
         severance payments or other benefits as a result of the Merger or the
         transactions contemplated by this Agreement in the event of the
         subsequent termination of their employment.

                  (m) VOTING REQUIREMENTS. The affirmative vote of the holders
         of a majority of the outstanding shares of Weatherford Common Stock is
         the only vote of the


                                      -13-




         holders of any class or series of the capital stock of Weatherford
         necessary to approve this Agreement and the Merger.

                  (n) INSURANCE. The Weatherford Disclosure Letter sets forth
         all policies of insurance currently in effect relating to the business
         or operations of Weatherford and the Weatherford Subsidiaries.

                  (o) TITLE TO PROPERTY. Except as set forth in the Weatherford
         Commission Filings, Weatherford and each of the Weatherford
         Subsidiaries have good and indefeasible title to all of their real
         properties purported to be owned in fee and good title to all their
         other material assets, free and clear of all mortgages, liens, charges
         and encumbrances other than Permitted Liens.

                  (p) WEATHERFORD ACTIONS. As of the date hereof, the Board of
         Directors of Weatherford (at a meeting duly called and held) has
         resolved to recommend approval and adoption of this Agreement and the
         Merger by the stockholders of Weatherford. Merrill Lynch & Co. has
         delivered to the Board of Directors of Weatherford its opinion that the
         consideration to be paid by Weatherford pursuant to the Merger is fair
         to Weatherford from a financial point of view.

         2.3 REPRESENTATIONS AND WARRANTIES OF ENTERRA. Enterra hereby
represents and warrants to Weatherford that, except as expressly contemplated by
this Agreement or as set forth in the disclosure letter delivered by Enterra to
Weatherford on the date hereof (the "Enterra Disclosure Letter"):

                  (a) ORGANIZATION AND COMPLIANCE WITH LAW. Enterra and each of
         its corporate subsidiaries (the "Enterra Subsidiaries") is a
         corporation duly organized, validly existing and in good standing under
         the laws of the jurisdiction in which it is organized and has all
         requisite corporate power and authority and all necessary governmental
         authorizations to own, lease and operate all of its properties and
         assets and to carry on its business as now being conducted, except
         where the failure to do so would not, either individually or in the
         aggregate, have a Material Adverse Effect. Enterra and each of the
         Enterra Subsidiaries is duly qualified as a foreign corporation to do
         business, and is in good standing, in each jurisdiction in which the
         property owned, leased or operated by it or the nature of the business
         conducted by it makes such qualification necessary, except in such
         jurisdictions where the failure to do so does not and would not, either
         individually or in the aggregate, have a Material Adverse Effect.
         Enterra and each of the Enterra Subsidiaries is in compliance with all
         applicable laws, judgments, orders, rules and regulations, domestic and
         foreign, except where failure to be in such compliance would not,
         either individually or in the aggregate, have a Material Adverse
         Effect. Enterra has heretofore delivered to Weatherford true and
         complete copies of Enterra's Restated Certificate of Incorporation and
         bylaws, as in existence on the date hereof.



                                      -14-





                  (b)      CAPITALIZATION.

                           (i) The authorized capital stock of Enterra consists
                  of 40,000,000 shares of Enterra Common Stock, par value $1.00
                  per share, and 10,000,000 shares of series preferred stock,
                  par value $1.00 per share. As of June 21, 1995, there were
                  issued and outstanding 27,774,950 shares of Enterra Common
                  Stock and no shares of series preferred stock, and no shares
                  of Enterra Common Stock were held as treasury shares. As of
                  June 21, 1995, there were reserved for issuance 2,587,071
                  shares of Enterra Common Stock pursuant to stock option plans
                  (collectively, the "Enterra Options"). All issued shares of
                  Enterra Common Stock are validly issued, fully paid and
                  nonassessable and no holder thereof is entitled to preemptive
                  rights. Enterra is not a party to, and, excluding agreements
                  among various funds held or managed by institutional
                  investors, has no knowledge of, any voting agreement, voting
                  trust or similar agreement or arrangement relating to any
                  class or series of its capital stock, or any agreement or
                  arrangement providing for registration rights with respect to
                  any capital stock or other securities of Enterra. All
                  outstanding shares of capital stock of the Enterra
                  Subsidiaries are owned by Enterra, free and clear of all
                  liens, charges, encumbrances, adverse claims and options of
                  any nature; provided, however, that Enterra's ownership of
                  shares of capital stock of certain foreign Enterra
                  Subsidiaries may be subject to Permitted Liens.

                           (ii) Other than as set forth in this Section 2.3(b)
                  and as contemplated by Section 4.1(b)(iii), there are not
                  now, and at the Effective Time there will not be, any (A)
                  shares of capital stock or other equity securities of
                  Enterra outstanding (other than Enterra Common Stock issued
                  pursuant to Enterra Options as described herein) or (B)
                  outstanding options, warrants, scrip, rights to subscribe
                  for, calls or commitments of any character whatsoever
                  relating to, or securities or rights convertible into or
                  exchangeable for, shares of any class of capital stock of
                  Enterra, or contracts, understandings or arrangements to
                  which Enterra is a party, or by which it is or may be bound,
                  to issue additional shares of its capital stock or options,
                  warrants, scrip or rights to subscribe for, or securities or
                  rights convertible into or exchangeable for, any additional
                  shares of its capital stock.

                  (c)      AUTHORIZATION AND VALIDITY OF AGREEMENT.  Enterra has
         all requisite  corporate power and authority to enter into this
         Agreement and to perform its obligations hereunder. The execution and
         delivery by Enterra of this Agreement and the consummation by it of the
         transactions contemplated hereby have been duly authorized by all
         necessary corporate action (subject only, with respect to the Merger,
         to adoption and approval of this Agreement by its stockholders as
         provided for in Section 5.3(a)). This Agreement has been duly executed
         and delivered by Enterra and is the valid and binding obligation of
         Enterra, enforceable against Enterra in accordance with its terms,
         except as such enforceability may be limited or affected by (i)
         bankruptcy, insolvency, reorganization, moratorium, liquidation,
         arrangement, fraudulent transfer, fraudulent conveyance and other
         similar laws (including, without



                                      -15-





         limitation, court decisions) now or hereafter in effect and affecting
         the rights and remedies of creditors generally or providing for the
         relief of debtors, (ii) the refusal of a particular court to grant
         equitable remedies, including, without limitation, specific performance
         and injunctive relief, and (iii) general principles of equity
         (regardless of whether such remedies are sought in a proceeding in
         equity or at law).

                  (d) NO APPROVALS OR NOTICES REQUIRED; NO CONFLICT WITH
         INSTRUMENTS TO WHICH ENTERRA IS A PARTY. Neither the execution and
         delivery of this Agreement nor the performance by Enterra of its
         obligations hereunder, nor the consummation of the transactions
         contemplated hereby by Enterra, will (i) conflict with Enterra's
         Restated Certificate of Incorporation or bylaws; (ii) assuming
         satisfaction of the requirements set forth in clause (iii) below,
         violate any provision of law applicable to Enterra; (iii) except for
         (A) requirements of Federal and state securities law, (B) requirements
         arising out of the HSR Act, (C) requirements of filings in such foreign
         jurisdictions as may be applicable and (D) the filing of a certificate
         of merger in accordance with the DGCL, require any consent or approval
         of, or filing with or notice to, any public body or authority, domestic
         or foreign, under any provision of law applicable to Enterra; or (iv)
         require any consent, approval or notice under, or violate, breach, be
         in conflict with or constitute a default (or an event that, with notice
         or lapse of time or both, would constitute a default) under, or permit
         the termination of any provision of, or result in the creation or
         imposition of any lien upon any properties, assets or business of
         Enterra under, any note, bond, indenture, mortgage, deed of trust,
         lease, franchise, permit, authorization, license, contract, instrument
         or other agreement or commitment or any order, judgment or decree to
         which Enterra is a party or by which Enterra or any of its assets or
         properties is bound or encumbered, except those that have already been
         given, obtained or filed and except in any of the cases enumerated in
         clauses (ii) through (iv), those that, in the aggregate, would not have
         a Material Adverse Effect.

                  (e) COMMISSION FILINGS; FINANCIAL STATEMENTS. Since January 1,
         1992, Enterra and each of the Enterra Subsidiaries have filed all
         reports, registration statements and other filings, together with any
         amendments required to be made with respect thereto, that they have
         been required to file with the Commission under the Securities Act and
         the Exchange Act. All reports, registration statements and other
         filings (including, without limitation, all notes, exhibits and
         schedules thereto and documents incorporated by reference therein)
         filed by Enterra with the Commission since January 1, 1992 through the
         date of this Agreement, together with any amendments thereto, are
         sometimes collectively referred to as the "Enterra Commission Filings".
         Enterra has heretofore delivered to Weatherford copies of the Enterra
         Commission Filings. As of the effectiveness dates declared by the
         Commission, in the case of registration statements, as of the mailing
         dates, in the case of proxy statements, or as of the filing dates with
         the Commission, in the case of all other Enterra Commission Filings,
         the Enterra Commission Filings complied, and the Proxy Statement
         (except with respect to information concerning Weatherford and the
         Weatherford Subsidiaries furnished by or on behalf of Weatherford to
         Enterra specifically for use therein) will comply, in all material
         respects with the Securities Act, the Exchange Act and the rules and
         regulations of the Commission promulgated thereunder, as applicable,
         and did not



                                      -16-






         or will not, as the case may be, contain any untrue statement of a
         material fact or omit to state a material fact required to be stated
         therein or necessary to make the statements made therein, in light of
         the circumstances under which they were made, not misleading.

                  All material contracts of Enterra and the Enterra Subsidiaries
         have been included in the Enterra Commission Filings, except for those
         contracts not required to be filed pursuant to the rules and
         regulations of the Commission.

                  Each of the audited consolidated financial statements
         (including, without limitation, any related notes or schedules)
         included or incorporated by reference in the Enterra Commission Filings
         was, and each of the audited consolidated financial statements to be
         included or incorporated by reference in the Proxy Statement (except
         for those financial statements of Weatherford and the Weatherford
         Subsidiaries furnished by or on behalf of Weatherford to Enterra
         specifically for use therein) will be, prepared in accordance with
         generally accepted accounting principles applied on a consistent basis
         (except as may be noted therein or in the notes or schedules thereto),
         and fairly presents or will fairly present, as the case may be, in all
         material respects, the consolidated financial position of Enterra and
         the Enterra Subsidiaries as of the dates thereof and the statements of
         income, cash flows and stockholders' equity for the periods then ended
         in accordance with generally accepted accounting principles. Each of
         the unaudited interim financial statements included or incorporated by
         reference in the Enterra Commission Filings was, and each of the
         unaudited consolidated financial statements to be included or
         incorporated by reference in the Proxy Statement (except for those
         financial statements of Weatherford and the Weatherford Subsidiaries
         furnished by or on behalf of Weatherford to Enterra specifically for
         use therein) will be, prepared in a manner consistent with the audited
         consolidated financial statements and generally accepted accounting
         principles. As of the date hereof, Enterra has no material liabilities,
         absolute or contingent, not reflected in the Enterra Commission
         Filings, except (i) liabilities not required under generally accepted
         accounting principles to be reflected on such financial statements or
         the notes thereto and (ii) liabilities incurred in the ordinary course
         of business since the date of such financial statements consistent with
         past operations and not relating to the borrowing of money.

                  (f) CONDUCT OF BUSINESS IN THE ORDINARY COURSE; ABSENCE OF
         CERTAIN CHANGES AND EVENTS. Since April 1, 1995, except as disclosed in
         the Enterra Commission Filings filed with the Commission since that
         date, Enterra and the Enterra Subsidiaries have conducted their
         business only in the ordinary and usual course, and there has not been
         (i) any Material Adverse Change in Enterra or any condition, event or
         development that reasonably may be expected to result in any Material
         Adverse Change; (ii) any change by Enterra in its accounting methods,
         principles or practices; (iii) any revaluation by Enterra or any of the
         Enterra Subsidiaries of any of its or their assets, including, without
         limitation, writing down the value of inventory or writing off notes or
         accounts receivable other than in the ordinary course of business; (iv)
         any entry by Enterra or any of the Enterra Subsidiaries into any
         commitment or transaction material to Enterra and the Enterra
         Subsidiaries, taken as a whole, other than in the ordinary




                                      -17-




         course of business; (v) any declaration, setting aside or payment of
         any dividends or distributions in respect of the Enterra Common Stock,
         or any redemption, purchase or other acquisition of any of its
         securities or any securities of any of the Enterra Subsidiaries; (vi)
         any damage, destruction or loss (whether or not covered by insurance)
         materially adversely affecting the properties or business of Enterra
         and the Enterra Subsidiaries, taken as a whole; (vii) any increase in
         indebtedness for borrowed money; (viii) any granting of a security
         interest or lien on any property or assets of Enterra and the Enterra
         Subsidiaries, other than Permitted Liens; or (ix) any increase in or
         establishment of any bonus, insurance, severance, deferred
         compensation, pension, retirement, profit sharing, stock option
         (including, without limitation, the granting of stock options, stock
         appreciation rights, performance awards or restricted stock awards),
         stock purchase or other employee benefit plan or any other increase in
         the compensation payable or to become payable to any officers or key
         employees of Enterra or any of the Enterra Subsidiaries.

                  (g) CERTAIN FEES. Neither Enterra nor any of its officers,
         directors or employees, on behalf of Enterra or any of the Enterra
         Subsidiaries or its or their respective Boards of Directors (or any
         committee thereof), has employed any financial advisor, broker or
         finder or incurred any liability for any financial advisory, brokerage
         or finders' fees or commissions in connection with the transactions
         contemplated hereby.

                  (h) LITIGATION. Except as disclosed in the Enterra Commission
         Filings, there are no claims, actions, suits, investigations or
         proceedings pending or, to the knowledge of Enterra, threatened against
         or affecting Enterra or any of the Enterra Subsidiaries or any of their
         respective properties at law or in equity, or any of their respective
         employee benefit plans or fiduciaries of such plans, or before or by
         any federal, state, municipal or other governmental agency or
         authority, or before any arbitration board or panel, wherever located,
         that, individually or in the aggregate, if adversely determined would
         have a Material Adverse Effect, or that involve the risk of criminal
         liability.

                  (i)      EMPLOYEE BENEFIT PLANS.  The Enterra Disclosure
         Letter sets forth a complete and accurate list of:

                           (i)      each "employee welfare benefit plan" (as
                  such term is defined in Section 3(1) of ERISA) (the "Enterra
                  Welfare Plans");

                           (ii)     each "employee pension benefit plan" (as
                  such term is defined in Section 3(2) of ERISA) (the "Enterra
                  Pension Plans"); and

                           (iii) all other employee benefit agreements or
                  arrangements, including, without limitation, deferred
                  compensation plans, incentive plans, bonus plans or
                  arrangements, stock option plans, stock purchase plans, golden
                  parachute agreements, severance pay plans, dependent care
                  plans, cafeteria plans, employee assistance programs,
                  scholarship programs, employment contracts and other


                                      -18-




                  similar plans, agreements and arrangements (collectively, with
                  the Enterra Welfare Plans and the Enterra Pension Plans, the
                  "Enterra Benefit Plans"),

         that are currently in effect or were maintained within three years of
         the Closing Date, or have been approved before this date but are not
         yet effective, for the benefit of directors, officers, employees or
         former employees (or their beneficiaries) of Enterra, any of the
         Enterra Subsidiaries incorporated in the United States (the "Enterra
         U.S. Subsidiaries") or any member of a controlled group or affiliated
         service group (as defined in Sections 414(b),(c),(m) and (o) of the
         Code) that is incorporated or domiciled in the United States of which
         Enterra or any of the Enterra U.S. Subsidiaries is a member
         (collectively, the "Enterra Group"). Enterra and the Enterra U.S.
         Subsidiaries will provide to Weatherford, as to each Enterra Benefit
         Plan, as applicable, access to a complete and accurate copy of (i) such
         plan, agreement or arrangement; (ii) the trust, group annuity contract
         or other document that provides the funding for such plan; (iii) the
         most recent annual Form 5500, 990 and 1041 reports; (iv) the most
         recent actuarial report or valuation statement; (v) the most current
         summary plan description, handbook or other booklet that describes any
         Enterra Benefit Plan, and any summary of material modifications
         prepared after each such summary plan description; (vi) the most recent
         IRS determination letter and all rulings or determinations requested
         from the IRS subsequent to the date of such determination letter; and
         (vii) all other pending correspondence from the IRS or the Department
         of Labor received by any member of the Enterra Group that relates to
         such plan.

                  Each Enterra Welfare Plan and Enterra Pension Plan (i) is in
         compliance with ERISA, including, without limitation, all reporting and
         disclosure requirements of Part 1 of Subtitle B of Title I of ERISA,
         except where the failure to be in compliance would not, either
         individually or in the aggregate, have a Material Adverse Effect; (ii)
         is in compliance with the Code, except where the failure to be in
         compliance would not, either individually or in the aggregate, have a
         Material Adverse Effect; (iii) has had the appropriate Form 5500 timely
         filed for any Enterra Pension Plan, if applicable, for each year of its
         existence and for any Enterra Welfare Plan for each year of its
         existence after 1987, except where the failure to cause such timely
         filing would not, either individually or in the aggregate, have a
         Material Adverse Effect; (iv) has not engaged in any transaction
         described in Section 406 or 407 of ERISA or Section 4975 of the Code
         unless it received or is entitled to an exemption under Section 408 of
         ERISA or Section 4975 of the Code, as applicable, or unless such
         transaction has been corrected and all applicable excise taxes paid or
         waived; (v) has no issue pending (other than the payment of benefits in
         the normal course or the qualification of the plan pursuant to
         an application pending before the IRS) nor any issue resolved adversely
         to the Enterra Group that, in either case, may subject the Enterra
         Group to the payment of a penalty, interest, tax or other amount,
         which, either individually or in the aggregate, would have a Material
         Adverse Effect; and (vi) can be unilaterally terminated or amended on
         no more than 90 days notice. No notice has been received by the Enterra
         Group of an increase or proposed increase in any premium relative to
         any Enterra Benefit Plan, and no amendment to any Enterra Benefit Plan
         within the last twelve months has


                                      -19-




         increased the rate of employer contributions thereunder that, either
         individually or in the aggregate, would have a Material Adverse Effect.

                  Each Enterra Benefit Plan that is intended to be a voluntary
         employee benefit association has been submitted to and approved by the
         IRS as exempt from federal income tax under Section 501(c)(9) of the
         Code or the applicable submission period relating to any such plan will
         not have ended prior to the Closing. No Enterra Benefit Plan will cause
         the Enterra Group to have liability for severance pay as a result of
         this Agreement. The Enterra Group does not provide employee
         post-retirement medical or health coverage or contribute to or maintain
         any employee welfare benefit plan that provides for health benefit
         coverage following termination of employment except as required by
         Section 4980B(f) of the Code or other applicable statute, nor has the
         Enterra Group made any representations, agreements, covenants or
         commitments to provide that coverage.

                  Except for each Enterra Pension Plan that is an ERISA top-hat
         plan, each Enterra Pension Plan has been submitted to and approved as
         qualifying under Section 401(a) of the Code by the IRS or the
         applicable remedial amendment period relating to such plan will not
         have ended prior to the Closing. To the knowledge of Enterra, no facts
         have occurred that, if known by the IRS, could cause disqualification
         of any Enterra Pension Plan. Each Enterra Pension Plan to which Section
         412 of the Code is applicable fully complies with the funding
         requirements of that Section and there is no accumulated funding
         deficiency as defined in Section 302(a)(2) of ERISA (whether or not
         waived) in any such plan. The Enterra Group has paid all premiums
         (including, without limitation, interest, charges and penalties for
         late payment) due the PBGC with respect to each Enterra Pension Plan
         for which premiums are required. No Enterra Pension Plan has been
         terminated under circumstances that would result in liability to the
         PBGC or the Enterra Group. There has been no "reportable event" (as
         defined in Section 4043(b) of ERISA and the regulations under that
         Section) with respect to any Enterra Pension Plan subject to Title IV
         of ERISA. With respect to each Enterra Pension Plan subject to Title IV
         of ERISA, the Enterra Group has not (i) ceased operations at a facility
         so as to become subject to the provisions of Section 4062(e) of ERISA,
         (ii) withdrawn as a substantial employer so as to become subject to the
         provisions of Section 4063 of ERISA or (iii) ceased making
         contributions on or before the Closing Date to any such plan subject to
         Section 4064(a) of ERISA to which the Enterra Group made contributions
         at any time during the six years prior to the Closing Date. Neither the
         Enterra Group nor any member thereof has made a complete or partial
         withdrawal from a multiemployer plan (as defined in Section 3(37) of
         ERISA) so as to incur withdrawal liability as defined in Section 4201
         of ERISA.

                  Enterra's subsidiaries incorporated outside of the United
         States and any benefit plans maintained by any of them for the benefit
         of their directors, officers, employees or former employees (or any of
         their beneficiaries) are in compliance with applicable laws pertaining
         to such plans in the jurisdictions of such subsidiaries, except where
         such failure to be in compliance would not, either individually or in
         the aggregate, have a Material Adverse Effect.




                                      -20-



                  (j) TAXES. All Tax Returns of or relating to any Taxes that
         are required to be filed on or before the Closing Date by or with
         respect to Enterra or any of the Enterra Subsidiaries have been or will
         be duly and timely filed, and all Taxes, including, without limitation,
         interest and penalties, due and payable pursuant to such Tax Returns
         have been paid or adequately provided for in reserves established by
         Enterra, except where the failure to file, pay or provide for would
         not, either individually or in the aggregate, have a Material Adverse
         Effect. All Tax Returns of or with respect to Enterra or any of the
         Enterra Subsidiaries have been audited by the applicable governmental
         authority, or the applicable statute of limitations has expired, for
         all periods up to and including, without limitation, the tax year ended
         December 31, 1987. There is no material claim against Enterra or any of
         the Enterra Subsidiaries with respect to any Taxes, and no material
         assessment, deficiency or adjustment has been asserted or proposed with
         respect to any Tax Return of or with respect to Enterra or any of the
         Enterra Subsidiaries that has not been adequately provided for in
         reserves established by Enterra. The total amounts set up as
         liabilities for current and deferred Taxes in the consolidated
         financial statements included in the Enterra Commission Filings have
         been prepared in accordance with generally accepted accounting
         principles and are sufficient to cover the payment of all material
         Taxes, including, without limitation, any penalties or interest thereon
         and whether or not assessed or disputed, that are, or are hereafter
         finally determined to be, or to have been, due with respect to the
         operations of Enterra and the Enterra Subsidiaries through the periods
         covered thereby.

                  (k)      ENVIRONMENTAL.

                           (i) There are no facts, conditions or circumstances
                  known to Enterra that could cause Enterra or any Enterra
                  Subsidiary to incur any loss, liability, damage, cost or
                  expense, either individually or in the aggregate, in excess of
                  Enterra's charges, accruals and reserves for environmental
                  matters reflected on Enterra's consolidated balance sheet
                  contained in the most recent Enterra Commission Filing, for
                  (A) violations of Environmental Laws, (B) failure to obtain an
                  Environmental Permit, (C) a requirement to install
                  environmental or pollution control equipment, (D) removal,
                  response or remedial costs related to Hazardous Materials or
                  (E) personal injury, property damage or natural resources
                  damage resulting from exposure to or releases of Hazardous
                  Materials, except in each case where such loss, liability,
                  damage, cost or expense would not have a Material Adverse
                  Effect.

                           (ii) The business and any other operations conducted
                  by Enterra or any Enterra Subsidiary are in compliance with
                  all applicable limitations, restrictions, conditions,
                  standards, prohibitions, requirements and obligations
                  established under applicable Environmental Laws, except where
                  the failure to be in compliance would not, either individually
                  or in the aggregate, have a Material Adverse Effect.


                                      -21-





                  (l)    NO SEVERANCE PAYMENTS. None of Enterra or the Enterra
         Subsidiaries will owe a severance payment or similar obligation to any
         of their respective employees, officers or directors as a result of the
         Merger or the transactions contemplated by this Agreement, nor will any
         of such persons be entitled to an increase in severance payments or
         other benefits as a result of the Merger or the transactions
         contemplated by this Agreement in the event of the subsequent
         termination of their employment.

                  (m)    VOTING REQUIREMENTS. The affirmative vote of the
         holders of a majority of the outstanding shares of Enterra Common Stock
         is the only vote of the holders of any class or series of the capital
         stock of Enterra necessary to approve this Agreement and the Merger.

                  (n)    INSURANCE. The Enterra Disclosure Letter sets forth all
         policies of insurance currently in effect relating to the business or
         operations of Enterra and the Enterra Subsidiaries.

                  (o)    TITLE TO PROPERTY. Except as set forth in the Enterra
         Commission Filings, Enterra and each of the Enterra Subsidiaries have
         good and indefeasible title to all of their real properties purported
         to be owned in fee and good title to all their other material assets,
         free and clear of all mortgages, liens, charges and encumbrances other
         than Permitted Liens.

                  (p)    ENTERRA ACTIONS. As of the date hereof, the Board of
         Directors of Enterra (at a meeting duly called and held) has resolved
         to recommend approval and adoption of this Agreement and the Merger by
         the stockholders of Enterra. Simmons & Company International, Inc. has
         delivered to the Board of Directors of Enterra its opinion that the
         consideration to be received by the stockholders of Enterra pursuant to
         the Merger is fair to the stockholders of Enterra from a financial
         point of view.

                                   ARTICLE III
              COVENANTS OF WEATHERFORD PRIOR TO THE EFFECTIVE TIME

         3.1   CONDUCT OF BUSINESS BY WEATHERFORD PENDING THE MERGER.
Weatherford covenants and agrees that, from the date of this Agreement until the
Effective Time, unless Enterra shall otherwise provide its prior consent in
writing (which consent shall not be unreasonably withheld) or as otherwise
expressly contemplated by this Agreement or as set forth in the Weatherford
Disclosure Letter:

                  (a)    The business of Weatherford and the Weatherford
         Subsidiaries shall be conducted only in, and Weatherford and the
         Weatherford Subsidiaries shall not take any action except in, the
         ordinary course of business;

                  (b)    Weatherford shall not, and shall not permit any of the
         Weatherford Subsidiaries to:


                                      -22-



                           (i)     split, combine or reclassify any outstanding
                  capital stock of Weatherford, or authorize, declare, set aside
                  or pay any dividend payable in cash, stock, property or
                  otherwise in respect of the capital stock of Weatherford;

                           (ii)    authorize or pay any extraordinary bonuses to
                  employees;

                           (iii)   grant any stock options or rights to acquire
                  Weatherford Common Stock or common stock of any of the
                  Weatherford Subsidiaries to any person or entity, other than
                  options to purchase Weatherford Common Stock issued pursuant
                  to employee stock option plans in amounts consistent with past
                  practice;

                           (iv)    authorize or issue, sell, pledge, dispose of
                  or encumber any shares of capital stock of Weatherford or,
                  except to Weatherford or a wholly-owned Weatherford
                  Subsidiary, any of the Weatherford Subsidiaries, other than
                  pursuant to Weatherford Options;

                           (v)     sell, pledge, dispose of or encumber any
                  assets of Weatherford or any of the Weatherford Subsidiaries,
                  other than (A) in the ordinary course of business, (B) not
                  relating to the borrowing of money, (C) with respect to
                  purchase money security interests or (D) with respect to
                  encumbered assets acquired in connection with an acquisition
                  permitted under Section 3.1(b)(viii);

                           (vi)    redeem, purchase, acquire or offer to acquire
                  any shares of Weatherford Common Stock;

                           (vii)   enter into, or grant any material change in,
                  employment, compensation, benefit, severance, consulting or
                  stay-bonus arrangements;

                           (viii)  acquire any corporation, partnership, other
                  business organization or division thereof for a purchase price
                  in excess of $5,000,000 or acquire corporations, partnerships,
                  other business organizations or divisions thereof for an
                  aggregate purchase price in excess of $15,000,000;

                           (ix)    enter into any contract, agreement,
                  commitment or arrangement other than in the ordinary course of
                  business;

                           (x)     authorize any capital expenditures other than
                  in the ordinary course of business, and in accordance with a
                  plan previously presented to, and not rejected by, the
                  Weatherford Board of Directors;

                           (xi)    incur any obligation for borrowed money or
                  purchase money indebtedness, whether or not evidenced by a
                  note, bond, debenture or similar instrument, except in the
                  ordinary course of business, and in no event in excess of the
                  unused credit available from time to time under existing
                  credit facilities of Weatherford;


                                      -23-



                           (xii)   amend or propose to amend the charter or
                  bylaws of Weatherford or any of the Weatherford Subsidiaries
                  in which Weatherford, either directly or indirectly, has less
                  than a 100% equity interest; or

                           (xiii)  take, and Weatherford shall use its
                  reasonable efforts to prevent any affiliate of Weatherford
                  from taking, any action that would prevent, including with the
                  passage of time, the Merger's qualification for "pooling of
                  interests" accounting treatment or prevent the Merger from
                  being treated for federal income tax purposes as a
                  reorganization within the meaning of Section 368(a) of the
                  Code;

                  (c)      Weatherford shall use all reasonable efforts (i) to
         preserve intact the business organization of Weatherford and each of
         the Weatherford Subsidiaries whose stock is pledged under existing
         credit facilities, (ii) to maintain in effect any material franchises,
         authorizations or similar rights of Weatherford and each of the
         Weatherford Subsidiaries, (iii) to keep available the services of the
         current officers and key employees of Weatherford and each of the
         Weatherford Subsidiaries, (iv) to preserve its goodwill with those
         having material business relationships with Weatherford and the
         Weatherford Subsidiaries, (v) to maintain and keep the material
         properties of Weatherford and each of the Weatherford Subsidiaries in
         as good a repair and condition as presently exists, except for
         deterioration due to ordinary wear and tear and damage due to casualty,
         and (vi) to maintain in full force and effect insurance comparable in
         amount and scope of coverage to that currently maintained by
         Weatherford and the Weatherford Subsidiaries; and

                  (d)      Weatherford shall not, and shall not permit any of
         the Weatherford Subsidiaries to, take any action that would, or that
         reasonably could be expected to, result in any of the representations
         and warranties set forth in this Agreement becoming untrue or any of
         the conditions to the Merger set forth in Article VI not being
         satisfied. Weatherford promptly shall advise Enterra orally and in
         writing of any change or event having, or which, insofar as reasonably
         can be foreseen, would have, a Material Adverse Effect on Weatherford.

         3.2      ACCESS TO INFORMATION. From the date hereof to the Effective
Time, Weatherford shall, and shall cause the Weatherford Subsidiaries and its
and their officers, directors, employees and representatives to, afford the
representatives of Enterra complete access during normal business hours to its
officers, employees, representatives, properties, books and records, and shall
furnish Enterra all financial, operating and other data and information as
Enterra, through its representatives, reasonably may request; PROVIDED, HOWEVER,
that notwithstanding the foregoing provisions of this Section 3.2 or any other
provision of this Agreement, Weatherford shall not be required to provide to
Enterra any information that is the subject of a confidentiality agreement and
that relates primarily to a party other than Weatherford, a Weatherford
Subsidiary or a former subsidiary of Weatherford.


                                      -24-



         3.3      AFFILIATES' AGREEMENTS. Weatherford will use its reasonable
efforts to cause each stockholder who, in the opinion of counsel to Weatherford,
is an "affiliate" of Weatherford to enter into an agreement substantially in the
form of Exhibit 3.3.

         3.4      RESERVATION OF WEATHERFORD COMMON STOCK. Weatherford shall
reserve for issuance, out of its authorized but unissued capital stock, such
number of shares of Weatherford Common Stock as may be issuable upon
consummation of the Merger.

         3.5      STOCK EXCHANGE LISTING. Weatherford shall use all reasonable
efforts to cause the shares of Weatherford Common Stock to be issued upon
consummation of the Merger to be approved for listing on the New York Stock
Exchange, subject to official notice of issuance, prior to the Closing Date.

                                   ARTICLE IV
                COVENANTS OF ENTERRA PRIOR TO THE EFFECTIVE TIME

         4.1      CONDUCT OF BUSINESS BY ENTERRA PENDING THE MERGER. Enterra
covenants and agrees that, from the date of this Agreement until the Effective
Time, unless Weatherford shall otherwise provide its prior consent in writing
(which consent shall not be unreasonably withheld) or as otherwise expressly
contemplated by this Agreement or as set forth in the Enterra Disclosure Letter:

                  (a)      The business of Enterra and the Enterra Subsidiaries
         shall be conducted only in, and Enterra and the Enterra Subsidiaries
         shall not take any action except in, the ordinary course of business;

                  (b)      Enterra shall not, and shall not permit any of the
         Enterra Subsidiaries to:

                           (i)     split, combine or reclassify any outstanding
                  capital stock of Enterra, or authorize, declare, set aside or
                  pay any dividend payable in cash, stock, property or otherwise
                  in respect of the capital stock of Enterra;

                           (ii)    authorize or pay any extraordinary bonuses to
                  employees;

                           (iii)   grant any stock options or rights to acquire
                  Enterra Common Stock or common stock of any of the Enterra
                  Subsidiaries to any person or entity, other than options to
                  purchase Enterra Common Stock issued pursuant to employee
                  stock option plans in amounts consistent with past practice;

                           (iv)    authorize or issue, sell, pledge, dispose of
                  or encumber any shares of capital stock of Enterra or, except
                  to Enterra or a wholly-owned Enterra Subsidiary, any of the
                  Enterra Subsidiaries, other than pursuant to Enterra Options;

                           (v)     sell, pledge, dispose of or encumber any
                  assets of Enterra or any of the Enterra Subsidiaries, other
                  than (A) in the ordinary course of business,


                                      -25-



                  (B) not relating to the borrowing of money, (C) with respect
                  to purchase money security interests or (D) with respect to
                  encumbered assets acquired in connection with an acquisition
                  permitted under Section 4.1(b)(viii);

                           (vi)    redeem, purchase, acquire or offer to acquire
                  any shares of Enterra Common Stock;

                           (vii)   enter into, or grant any material change in,
                  employment, compensation, benefit, severance, consulting or
                  stay-bonus arrangements;

                           (viii)  acquire any corporation, partnership, other
                  business organization or division thereof for a purchase price
                  in excess of $5,000,000 or corporations, partnerships, other
                  business organizations or divisions thereof for an aggregate
                  purchase price in excess of $15,000,000;

                           (ix)    enter into any contract, agreement,
                  commitment or arrangement other than in the ordinary course of
                  business;

                           (x)     authorize any capital expenditures other than
                  in the ordinary course of business, and in accordance with a
                  plan previously presented to, and not rejected by, the Enterra
                  Board of Directors;

                           (xi)    incur any obligation for borrowed money or
                  purchase money indebtedness, whether or not evidenced by a
                  note, bond, debenture or similar instrument, except in the
                  ordinary course of business, and in no event in excess of the
                  unused credit available from time to time under existing
                  credit facilities of Enterra;

                           (xii)   amend or propose to amend the charter or
                  bylaws of Enterra or any of the Enterra Subsidiaries in which
                  Enterra, either directly or indirectly, has less than a 100%
                  equity interest; or

                           (xiii)  take, and Enterra shall use its reasonable
                  efforts to prevent any affiliate of Enterra from taking, any
                  action that would prevent, including with the passage of time,
                  the Merger's qualification for "pooling of interests"
                  accounting treatment or prevent the Merger from being treated
                  for federal income tax purposes as a reorganization within the
                  meaning of Section 368(a) of the Code;

                  (c)      Enterra shall use its reasonable efforts (i) to
         preserve intact the business organization of Enterra and each of the
         Enterra Subsidiaries whose stock is pledged under existing credit
         facilities, (ii) to maintain in effect any material franchises,
         authorizations or similar rights of Enterra and each of the Enterra
         Subsidiaries, (iii) to keep available the services of the current
         officers and key employees of Enterra and each of the Enterra
         Subsidiaries, (iv) to preserve its goodwill with those having material
         business relationships with Enterra and the Enterra Subsidiaries, (v)
         to maintain and


                                      -26-



         keep the material properties of Enterra and each of the Enterra
         Subsidiaries in as good a repair and condition as presently exists,
         except for deterioration due to ordinary wear and tear and damage due
         to casualty, and (vi) to maintain in full force and effect insurance
         comparable in amount and scope of coverage to that currently maintained
         by Enterra and each of the Enterra Subsidiaries; and


                  (d) Enterra shall not, and shall not permit any of the Enterra
Subsidiaries to, take any action that would, or that reasonably could
be expected to, result in any of the representations and warranties set
forth in this Agreement becoming untrue or any of the conditions to the
Merger set forth in Article VI not being satisfied. Enterra promptly
shall advise Weatherford orally and in writing of any change or event
having, or which, insofar as reasonably can be foreseen, would have, a
Material Adverse Effect on Enterra.

         4.2      ACCESS TO INFORMATION. From the date hereof to the Effective
Time, Enterra shall, and shall cause the Enterra Subsidiaries and its and their
officers, directors, employees and representatives to, afford the
representatives of Weatherford complete access during normal business hours to
its officers, employees, representatives, properties, books and records, and
shall furnish Weatherford all financial, operating and other data and
information as Weatherford, through its representatives, reasonably may request;
PROVIDED, HOWEVER, that notwithstanding the foregoing provisions of this Section
4.2 or any other provision of this Agreement, Enterra shall not be required to
provide to Weatherford any information that is the subject of a confidentiality
agreement and that relates primarily to a party other than Enterra, an Enterra
Subsidiary or a former subsidiary of Enterra.

         4.3      AFFILIATES' AGREEMENTS. Enterra will use its reasonable
efforts to cause each stockholder who, in the opinion of counsel to Enterra, is
an "affiliate" of Enterra to enter into an agreement substantially in the form
of Exhibit 4.3.

                                    ARTICLE V
                              ADDITIONAL AGREEMENTS

         5.1      JOINT PROXY STATEMENT/PROSPECTUS; REGISTRATION STATEMENT. As
promptly as practicable after the execution of this Agreement, Weatherford and
Enterra shall prepare and file with the Commission preliminary proxy materials
that shall constitute the joint proxy statement (the "Proxy Statement") of
Weatherford and Enterra and the registration statement with respect to the
Weatherford Common Stock to be issued in connection with the Merger (the
"Registration Statement"). As promptly as practicable after comments are
received from the Commission on the preliminary proxy materials, Weatherford and
Enterra shall file with the Commission a combined joint proxy statement and
registration statement on Form S-4 (or on such other form as shall be
appropriate) relating to the approval and adoption of the Merger and this
Agreement by the stockholders of Weatherford and the stockholders of Enterra and
the issuance by Weatherford of Weatherford Common Stock in connection with the
Merger and shall use their reasonable efforts to cause the Registration
Statement to become effective as soon as practicable. Subject to the terms and
conditions set forth in Section 7.2, the Proxy Statement shall contain a
statement that the Board of Directors of Enterra


                                      -27-



recommended that the stockholders of Enterra approve and adopt the Merger and
this Agreement. Subject to the terms and conditions set forth in Section 7.1,
the Proxy Statement shall contain a statement that the Board of Directors of
Weatherford recommended that the stockholders of Weatherford approve and adopt
the Merger and this Agreement.

         5.2      COMFORT LETTERS.

                  (a)      Enterra shall use its reasonable efforts to cause to
         be delivered to Weatherford a letter of KPMG Peat Marwick LLP dated as
         of a date within five business days before the date on which the
         Registration Statement shall become effective and addressed to
         Weatherford, in form and substance reasonably satisfactory to
         Weatherford and customary in scope and substance for "comfort" letters
         delivered by independent public accountants in connection with
         registration statements and proxy statements similar to the
         Registration Statement and Proxy Statement.

                  (b)      Weatherford shall use its reasonable efforts to cause
         to be delivered to Enterra a letter of Arthur Andersen LLP dated as of
         a date within five business days before the date on which the
         Registration Statement shall become effective and addressed to Enterra,
         in form and substance reasonably satisfactory to Enterra and customary
         in scope and substance for "comfort" letters delivered by independent
         public accountants in connection with registration statements and proxy
         statements similar to the Registration Statement and Proxy Statement.

         5.3      MEETINGS OF STOCKHOLDERS.

                  (a)      Enterra shall promptly take all action reasonably
         necessary in accordance with the DGCL and its Restated Certificate of
         Incorporation and bylaws to convene a meeting of its stockholders to
         consider and vote upon the adoption and approval of the Merger and this
         Agreement.  Subject to the terms and conditions set forth in Section
         7.2, the Board of Directors of Enterra (i) shall recommend at such
         meeting that the stockholders of Enterra vote to adopt and approve the
         Merger and this Agreement, (ii) shall use its reasonable efforts to
         solicit from stockholders of Enterra proxies in favor of such adoption
         and approval and (iii) shall take all other action reasonably necessary
         to secure a vote of its stockholders in favor of the adoption and
         approval of the Merger and this Agreement.

                  (b)      Weatherford shall promptly take all action reasonably
         necessary in accordance with the DGCL and its Restated Certificate of
         Incorporation and bylaws to convene a meeting of its stockholders to
         consider and vote upon the adoption and approval of the Merger and this
         Agreement. Subject to the terms and conditions set forth in Section
         7.1, the Board of Directors of Weatherford (i) shall recommend at such
         meeting that the stockholders of Weatherford vote to adopt and approve
         the Merger and this Agreement, (ii) shall use its reasonable efforts to
         solicit from stockholders of Weatherford proxies in favor of such
         adoption and approval and (iii) shall take all other action reasonably
         necessary to secure a vote of its stockholders in favor of the adoption
         and approval of the Merger and this Agreement.


                                      -28-



                  (c)      Weatherford and Enterra shall coordinate and
         cooperate with respect to the timing of such meetings and shall
         endeavor to hold such meetings on the same day and as soon as
         practicable after the date hereof.

         5.4      REASONABLE EFFORTS; CONSENTS, APPROVALS AND WAIVERS. Upon the
terms and subject to the conditions set forth in this Agreement, each of the
parties agrees to use reasonable efforts to take, or cause to be taken, all
actions, and to do, or cause to be done, and to assist and cooperate with the
other party in doing, all things necessary, proper or advisable (a) to
consummate and make effective, in the most expeditious manner practicable, the
Merger, and the other transactions contemplated by this Agreement, including,
without limitation, (i) the obtaining of all necessary consents, approvals or
waivers required in connection with the authorization, execution and delivery of
this Agreement and the consummation of the Merger (provided that no such
consent, approval or waiver shall require such party to take any action that
would impair the value that such party reasonably attributes to the Merger) and
(ii) the execution and delivery of any additional instruments (including,
without limitation, any required supplemental indentures) necessary to
consummate the transactions contemplated by this Agreement; and (b) to defend
any non-regulatory lawsuits or other legal proceedings, whether judicial or
administrative, challenging this Agreement or the consummation of the
transactions contemplated hereby, including, without limitation, seeking to have
any stay or temporary restraining order entered by any court or other
governmental entity vacated or reversed.

         5.5      ANTITRUST MATTERS.  The obligations of each of the parties to
this Agreement shall include the following:

                  (a)      each of the parties hereto shall file a premerger
         notification and report form pursuant to the HSR Act with respect to
         the Merger as promptly as reasonably possible following execution and
         delivery of this Agreement. Each of the parties agrees to use best
         efforts to promptly respond to any request for additional information
         pursuant to Section (e)(1) of the HSR Act; and

                  (b)      each party hereto will furnish to the other copies of
         all correspondence, filings or communications between that party, or
         any of its representatives, on the one hand, and any governmental
         agency or authority, on the other hand, with respect to
         pre-notification obligations under any antitrust law with respect to
         this Agreement or the Merger; PROVIDED, HOWEVER, that with respect to
         any documents that the party reasonably believes should not be
         disclosed to the other party, the party shall instead furnish those
         documents to counsel for the other party pursuant to a mutually
         satisfactory confidentiality agreement.

         5.6      NOTIFICATION OF CERTAIN MATTERS. Enterra shall give prompt
notice to Weatherford, and Weatherford shall give prompt notice to Enterra,
orally and in writing, of (a) the occurrence, or failure to occur, of any event
which occurrence or failure would be likely to cause any representation or
warranty contained in this Agreement to be untrue or inaccurate at any time from
the date hereof to the Effective Time, (b) any material failure of Enterra or
Weatherford, as the case may be, or any officer, director, employee or agent
thereof, to comply


                                      -29-



with or satisfy any covenant, condition or agreement to be complied with or
satisfied by it hereunder, and (c) any fact or event that would make it
necessary to amend the Registration Statement or the Proxy Statement to render
the statements therein not misleading or to comply with applicable law.

         5.7      AGREEMENT TO DEFEND.  In the event any claim, action, suit,
investigation or other proceeding by any governmental body or other person or
other legal or administrative proceeding is commenced that questions the
validity or legality of the transactions contemplated hereby or seeks damages in
connection therewith, whether before or after the Effective Time, the parties
hereto agree to cooperate and use their reasonable efforts to defend against and
respond thereto; PROVIDED, HOWEVER, that this Section 5.7 shall not apply to
any governmental investigation contemplated under Section 5.5(a).

         5.8      EXPENSES.  Subject to the terms and conditions set forth in
Section 7.3, and except as otherwise agreed to in writing by the parties, all
costs and expenses incurred in connection with this Agreement and the
transactions contemplated hereby shall be paid by the party incurring such
expenses.

         5.9      INDEMNIFICATION.

                  (a)      After the Effective Time Weatherford and the
         Surviving Corporation shall, to the fullest extent permitted under
         applicable law, defend, indemnify and hold harmless each person who is
         now, or has been at any time prior to the date hereof or who becomes
         prior to the Effective Time, an officer or director of Enterra or any
         of the Enterra Subsidiaries (each, an "Indemnified Party" and,
         collectively, the "Indemnified Parties") against (i) all costs or
         expenses (including, without limitation, reasonable attorneys' fees),
         judgments, fines, losses, claims, damages, liabilities and amounts paid
         in settlement in connection with any claim, action, suit, proceeding or
         investigation, whether civil, criminal, administrative or
         investigative, based in whole or in part on, or arising in whole or in
         part out of, the fact that such person is or was an officer or
         director, whether pertaining to any matter existing or occurring at or
         prior to the Effective Time and whether asserted or claimed prior to,
         or at or after, the Effective Time (collectively, the "Indemnified
         Liabilities"); and (ii) all Indemnified Liabilities based in whole or
         in part on, or arising in whole or in part out of, or pertaining to,
         this Agreement, the Merger or the transactions contemplated hereby.
         After the Effective Time, Weatherford and the Surviving Corporation
         will be entitled to participate in and, to the extent that it may wish,
         to assume the defense of any action, with counsel reasonably
         satisfactory to the Indemnified Party; PROVIDED, HOWEVER, if any
         Indemnified Party believes that, by reason of an actual or potential
         conflict of interest, it is advisable for such Indemnified Party to be
         represented by separate counsel, or if Weatherford or the Surviving
         Corporation shall fail after the Effective Time to assume
         responsibility for such defense, such Indemnified Party may retain
         counsel reasonably satisfactory to Weatherford and the Surviving
         Corporation who will represent such Indemnified Party, and Weatherford
         and the Surviving Corporation shall pay all reasonable fees and
         disbursements of such counsel promptly as statements therefor are
         received to the fullest extent permitted by applicable law upon receipt
         of


                                      -30-



         any undertaking contemplated by Section 145(e) of the DGCL. The
         Indemnified Party, Weatherford and the Surviving Corporation will
         cooperate with each other and use their reasonable efforts to assist
         each other in the vigorous defense of any such matter; PROVIDED,
         HOWEVER, that neither Weatherford nor the Surviving Corporation shall
         be liable for any settlement of any claim effected without its written
         consent, which consent, however, shall not be unreasonably withheld.
         Any Indemnified Party wishing to claim indemnification under this
         Section 5.9, upon learning of any such claim, action, suit, proceeding
         or investigation, shall promptly notify Weatherford or the Surviving
         Corporation, as applicable (but the failure to be so notified by an
         Indemnified Party shall not relieve an indemnifying party from any
         liability that it may have under this Section 5.9 except to the extent
         such failure materially prejudices such indemnifying party). The
         indemnifying parties shall be required to pay for only one law firm
         (in addition to any required local counsel) selected by the
         Indemnified Parties as a group in accordance with the foregoing
         provisions with respect to each such matter unless there is, under
         applicable standards of professional conduct, a conflict in any
         significant issue between the positions of any two or more Indemnified
         Parties. This Section 5.9 is intended to be for the benefit of, and
         shall be enforceable by, each Indemnified Party, his or her heirs and
         his or her representatives.

                  (b)      For a period of six years after the Effective Time,
         the Surviving Corporation shall use its best efforts to maintain in
         effect director and officer liability insurance for the benefit of the
         Indemnified Parties in comparable amounts, with comparable deductibles
         or retained amounts and with comparable coverages and exclusions as
         currently maintained by Enterra; PROVIDED, HOWEVER, that if the
         Surviving Corporation is unable to obtain insurance for such period for
         an aggregate premium of $1,000,000 or less or if such insurance
         otherwise cannot be obtained or maintained by the Surviving
         Corporation, then the Surviving Corporation's obligation pursuant
         hereto shall only be to seek to be obtained the best possible coverage
         under the circumstances subject to the foregoing limitation on
         premiums.

                  (c)      All rights and obligations under this Section 5.9
         shall be in addition to any rights an Indemnified Party may have under
         the Restated Certificate of Incorporation or bylaws of Enterra as in
         effect on the date hereof, or pursuant to any other agreement,
         arrangement or document in effect prior to the Effective Time. The
         provisions of this Section 5.9 are intended to benefit, and may be
         enforced by, all Indemnified Parties, and their respective heirs and
         representatives.  This Section 5.9 shall be binding upon all successors
         and assigns of Enterra, Weatherford and the Surviving Corporation.

                  (d)      If the Surviving Corporation is sold to a third
         party, such third party shall expressly assume the Surviving
         Corporation's indemnification obligation under this Section 5.9.

         5.10     POST-EFFECTIVE TIME MAILING. As soon as practicable following
the Effective Time, the Surviving Corporation will cause to be mailed to each
holder of certificates that represented Enterra Common Stock prior to the
Effective Time, at such holder's address as it


                                      -31-



appears on Enterra's stock transfer records, a letter of transmittal and other
information advising such holder of the consummation of the Merger and to enable
such holder to effect the exchange of stock certificates as contemplated by
Article I of this Agreement.

         5.11     STOCKHOLDERS' AGREEMENT. Weatherford will enter into a
Stockholders Agreement with First Reserve Corporation and the various First
Reserve Funds (as defined therein), in the form attached hereto as Exhibit 5.11.

         5.12     ENTERRA STOCK OPTIONS. At the Effective Time, each Enterra
Option that remains as of such date unexercised in whole or in part shall be
replaced by a substitute option, granted under an existing Weatherford stock
option plan, to purchase that number of shares of Weatherford Common Stock
determined by multiplying the number of shares of Enterra Common Stock subject
to such Enterra Option by the Conversion Rate and multiplying the exercise price
per share of such Enterra Option by a fraction the numerator of which is one and
the denominator of which is the Conversion Rate. Each such substitute option
shall otherwise replicate the terms and conditions of the Enterra Option it
replaces. Weatherford shall take all corporate action necessary (a) to reserve
for issuance a sufficient number of shares of Weatherford Common Stock for
delivery upon exercise of such Enterra Options, (b) to ensure that all shares of
Weatherford Common Stock subject to such Enterra Options are issued pursuant to
a plan that complies with the exemption provided by Rule 16b-3 promulgated under
the Exchange Act and (c) to ensure that shares of Weatherford Common Stock
issued pursuant to the exercise of such Enterra Options are registered under the
Securities Act, listed on the New York Stock Exchange and may be freely
transferred by the holders thereof.

         5.13     ENTERRA EMPLOYEE BENEFITS.

                  (a)      For the period beginning at the Effective Time and
         ending on June 30, 1996, Weatherford will either (i) cause to remain in
         effect all Enterra Benefit Plans, as in effect on the Effective Date,
         or (ii) provide benefits to employees of Enterra and the Enterra
         Subsidiaries under the Weatherford Benefit Plans that are substantially
         comparable to the benefits provided to such employees under the Enterra
         Benefit Plans, as in effect on the Effective Date. From and after July
         1, 1996, Weatherford agrees that participation in the Weatherford
         Benefit Plans, as then in effect, shall be made available to all
         Weatherford employees, including employees who were employees of
         Enterra, and that such plans will provide the same or substantially
         comparable benefits to all similarly situated employees.

                  (b)      If participation in any Weatherford Benefit Plan is
         made available to employees of Enterra or any Enterra Subsidiary, all
         service with Enterra and the Enterra Subsidiaries prior to the
         Effective Time and any other service recognized under the applicable
         Enterra Benefit Plans for vesting and eligibility purposes shall be
         credited to such employees and all waiting periods and pre-existing
         condition limitations shall be waived under such Weatherford Benefit
         Plan.


                                      -32-



                  (c)      Prior to the Effective Time, Enterra shall have
         established the Enterra Special Severance Pay Plan, in the form
         attached hereto as Exhibit 5.13.

                  (d)      Weatherford agrees that it shall make non-elective
         employer contributions, including fixed or discretionary pension,
         profit sharing and matching contributions, to each Enterra Benefit Plan
         that is intended to be a qualified defined contribution plan under
         Section 401(a) of the Code for the respective Enterra Benefit Plan's
         first plan year ending on or after the Effective Date in accordance
         with the terms of such plan. Weatherford agrees that the rate of each
         such non-elective employer contribution in each case shall not be less
         than the rate of such non-elective employer contribution that was made
         to the respective Enterra Benefit Plan for the last plan year ending
         prior to the Effective Date. An employee of Enterra or an Enterra
         Subsidiary who is employed, and who is a participant in an Enterra
         Benefit Plan that is subject to this Section 5.13(d), on the day before
         the Effective Date (an "Eligible Enterra Employee") shall be entitled
         to receive an allocation of such non-elective employer contributions
         without regard to whether such employee continues to be an employee of
         Enterra or an Enterra Subsidiary or any successor thereto on the last
         day of the respective Enterra Benefit Plan's plan year (or other
         period) for which such contributions are to be made. Weatherford agrees
         to make any amendment to the applicable Enterra Benefit Plans as may be
         necessary to effectuate the terms of this Section 5.13(d).

         5.14     UPDATE OF DISCLOSURE LETTERS.

                  (a)      Weatherford shall promptly disclose to Enterra in
         writing (i) any information set forth in the Weatherford Disclosure
         Letter with respect to subsections (b), (c), (e) and (g) of Section 2.2
         that no longer is accurate and with respect to all other subsections of
         Section 2.2 that no longer is accurate in any material respect and (ii)
         any information of the nature of that set forth in the Weatherford
         Disclosure Letter that arises between the date hereof and the Closing
         and that would have been required to be included in the Weatherford
         Disclosure Letter if such information had existed and been known or
         available on the date hereof. Neither any such new disclosure, nor the
         determination of Enterra to proceed with the Merger in spite of any
         such new disclosure, shall relieve Weatherford from any liability for
         any prior misrepresentation or breach of warranty.

                  (b)      Enterra shall promptly disclose to Weatherford in
         writing (i) any information set forth in the Enterra Disclosure Letter
         with respect to subsections (b), (c), (e) and (g) of Section 2.3 that
         no longer is accurate and with respect to all other subsections of
         Section 2.3 that no longer is accurate in any material respect and (ii)
         any information of the nature of that set forth in the Enterra
         Disclosure Letter that arises between the date hereof and the Closing
         and that would have been required to be included in the Enterra
         Disclosure Letter if such information had existed and been known or
         available on the date hereof. Neither any such new disclosure, nor the
         determination of Weatherford to proceed with the Merger in spite of any
         such new


                                      -33-



         disclosure, shall relieve Enterra from any liability for any prior
         misrepresentation or breach of warranty.

         5.15     WEATHERFORD SPECIAL SEVERANCE PAY PLAN.  Prior to the
Effective Time, Weatherford shall have established the Weatherford Special
Severance Pay Plan, in the form attached hereto as Exhibit 5.15.

         5.16     CHANGE OF CONTROL AGREEMENTS. Weatherford shall, as of the
Effective Time, have entered into change of control agreements, substantially in
the form of Exhibit 5.16(a), with the persons and for the respective severance
benefits set forth on Exhibit 5.16(b).

         5.17     INDEMNIFICATION AGREEMENTS. Weatherford shall, as of the
Effective Time, have entered into indemnification agreements, substantially in
the form of Weatherford's existing indemnification agreements with the persons
set forth on Exhibit 5.17.

         5.18     ENTERRA EMPLOYEE BONUSES.

                  (a)      The Enterra Board of Directors or the Executive
         Compensation Committee of the Enterra Board of Directors (the "Enterra
         Committee") shall determine, prior to the Closing Date, the final
         amount of bonuses to be paid to the Enterra employees listed on Exhibit
         5.18 for the fiscal year ended December 31, 1993, such amount not to
         exceed the amount that previously has been accrued for such bonuses.
         Such bonuses shall be paid only after collection of at least
         $10,000,000 of the disputed outstanding receivables from Kuwait Oil
         Company. If such bonuses are not paid prior to the Closing Date, (i)
         the determination of the Enterra Board of Directors or the Enterra
         Committee, as the case may be, will be binding upon Weatherford, (ii)
         any Enterra employee terminated after such date shall receive the
         entire amount of the bonus determined by the Enterra Board of Directors
         or the Enterra Committee, as the case may be, and (iii) payment of such
         bonuses shall be administered by Messrs. William E. Macaulay and Robert
         L. Parker, Sr., who will be directors of the Surviving Corporation.




                  (b)      The Enterra Board of Directors or the Enterra
         Committee shall declare, prior to the Closing Date, the amount of
         bonuses to Enterra employees, based upon Enterra's achievement of
         certain financial and other targets for Enterra for the fiscal year
         ending December 31, 1995, determined by the Enterra Board of Directors
         or the Enterra Committee, as the case may be, in a manner consistent
         with the Enterra and Total Energy Services Company bonus plans under
         which bonuses were paid for the fiscal year ended December 31, 1994.
         The final amount of bonuses shall be determined by the Enterra Board of
         Directors or the Enterra Committee, as the case may be, if audited
         financial results for the year ending December 31, 1995 are known prior
         to the Closing Date, or by Messrs. Macaulay and Parker, if such results
         are not known until after the Closing Date. Bonuses will be paid not
         earlier than February 1, 1996 and not later than February 28, 1996. Any
         Enterra employee terminated after the Closing Date shall receive the
         entire amount of the bonus.


                                      -34-



                  (c)      In addition to the 1995 bonuses referenced in Section
         5.18(b), Enterra may pay bonuses to Enterra employees in an amount not
         to exceed $1,000,000 in the aggregate. The recipients and amounts of
         such bonuses shall be determined in the sole discretion of the Enterra
         Committee; PROVIDED, HOWEVER, that the total amount paid to any one
         employee shall not exceed the aggregate of the current annualized
         salary and most recent annual bonus of such employee.

         5.19     ENTERRA SEVERANCE AGREEMENTS.

                  (a)      Each of the Enterra severance agreements with the
         individuals set forth on Exhibit 5.19 shall be amended to provide for
         gross-up payments if the party subject to such an agreement is subject
         to an excise tax under Section 4999 of the Code to ensure that such
         party receives the benefit intended under the applicable agreement.


                  (b)      The parties agree that, as a result of the Merger,
         any resignation by any of M. Timothy Carey, Steven C. Grant, Edward C.
         Grimes, Steven W. Krablin, J. Joseph Percle and Michael L. Stansberry
         at any time from the Effective Date through August 12, 1996 shall
         constitute a "Termination upon Change of Control" (as such term is
         defined in the severance agreement between such person and Enterra).
         Further, it is agreed that, for purposes of Section 3(a)(ii) of the
         severance agreement between Enterra and each such individual, if the
         bonus for the 1993 fiscal year is required to be taken into account,
         the final amount of the 1993 bonus determined by the Enterra Board of
         Directors or the Enterra Committee pursuant to Section 5.18(a) shall be
         counted, notwithstanding whether the disputed receivables from Kuwait
         Oil Company have been collected. It is further agreed that the manner
         in which the obligation to provide extended medical and dental benefits
         under Section 4(b) of each such individual's severance agreement with
         Enterra shall be to pay to such individual during the full period for
         which such benefits are required to be extended a monthly amount equal
         to the difference between the applicable COBRA continuation premium for
         such benefits and the premium, if any, charged to the individual for
         such benefits immediately prior to the Change in Control (as defined in
         such severance agreement) and such individual shall pay the full
         premium to the plan.

         5.20     ENTERRA CHAIRMAN, PRESIDENT AND CHIEF EXECUTIVE OFFICER.

                  (a)      Weatherford shall, as of the Effective Time, have
         entered into definitive arrangements with D. Dale Wood reflecting the
         principal terms set forth in Exhibit 5.20.

                  (b)      If the implementation of the principal terms set
         forth in Exhibit 5.20 shall make the Merger ineligible for
         pooling-of-interests accounting treatment under Accounting Principles
         Bulletin No. 16, Enterra agrees to use its best efforts to negotiate a
         package that would provide Mr. Wood in the aggregate with a
         substantially similar economic benefit.


                                      -35-




         5.21     WEATHERFORD CHAIRMAN, PRESIDENT AND CHIEF EXECUTIVE OFFICER.
Weatherford shall, as of the Effective Time, pay Philip Burguieres a fee in the
amount set forth in Exhibit 5.21.  If Mr. Burguieres' fee set forth in Exhibit
5.21 shall make the Merger ineligible for pooling-of-interests accounting
treatment under Accounting Principles Bulletin No. 16, Weatherford agrees to use
its best efforts to negotiate an alternative package with Mr. Burguieres.

         5.22     BOARD OF DIRECTORS.

                  (a)      The Board of Directors of Weatherford will take
         action prior to the Effective Time to cause the number of directors
         comprising the full Board of Directors of the Surviving Corporation at
         the Effective Time to be increased to ten persons, and the five persons
         listed on Exhibit 5.22 as the Enterra designees to the Board of
         Directors of the Surviving Corporation shall be elected to the Board of
         Directors of the Surviving Corporation by the Weatherford Board of
         Directors effective at the Effective Time, such increase in number and
         such election to be subject to the Closing. The Weatherford Board of
         Directors will also take action prior to the Effective Time to cause
         the committees of the Board of Directors of the Surviving Corporation
         at the Effective Time to be the committees listed on Exhibit 1.6(a)
         hereto, having the membership noted on such Exhibit, such action to
         be subject to the Closing. If prior to the Effective Time, any
         Enterra designee for director set forth on Exhibit 5.22, or if during
         the two years after the Effective Time, any Enterra designated
         director shall decline or be unable to serve as a director of the
         Surviving Corporation, the other Enterra designees or the remaining
         Enterra designated directors, as the case may be, shall designate
         another person to serve in such person's stead, subject to the
         approval of a majority of the Weatherford designated directors at that
         time, which approval shall not be unreasonably withheld. Weatherford
         agrees that, during the two year period after the Effective Time, it
         shall cause at least one Enterra designee listed on Exhibit 5.22 (or
         his successor chosen pursuant to this Section 5.22(a)) to be a member
         of each of the Executive and Nominating Committee, Audit Committee and
         Compensation and Stock Plans Committee of the Board of Directors of
         the Surviving Corporation.  Weatherford shall take all appropriate
         action for two years after the Effective Time to assist in the
         nomination for election as directors of the Enterra designees listed
         on Exhibit 5.22 (or any successor chosen pursuant to this Section
         5.22(a)).

                  (b)      Each person designated by Enterra to serve on the
         Board of Directors of the Surviving Corporation, and any person
         subsequently appointed to the Board of Directors of the Surviving
         Corporation by such designees pursuant to Section 5.22(a), shall be
         covered by the Weatherford International Incorporated Non-Employee
         Director Retirement Plan and the prior service of any such person on
         the Enterra Board of Directors shall count as service on the Board of
         Directors of the Surviving Corporation for all purposes under such
         plan.

                  (c)      If prior to the Effective Time, any Weatherford
         designee for director set forth on Exhibit 5.22, or if during the two
         years after the Effective Time, any Weatherford designated director
         shall decline or be unable to serve as a director of the


                                      -36-



         Surviving Corporation, the other Weatherford designees or the remaining
         Weatherford designated directors, as the case may be, shall designate
         another person to serve in such person's stead, subject to the approval
         of a majority of the Enterra designated directors at that time, which
         approval shall not be unreasonably withheld.

                                   ARTICLE VI
                                   CONDITIONS

         6.1      CONDITIONS TO OBLIGATIONS OF EACH PARTY TO EFFECT THE MERGER.
The respective obligations of each party to effect the Merger shall be subject
to the fulfillment or waiver at or prior to the Closing Date of the following
conditions:

                  (a)      This Agreement and the Merger shall have been
         approved and adopted by the requisite vote of the stockholders of
         Weatherford and the stockholders of Enterra as may be required by law
         and by any applicable provisions of their respective certificates of
         incorporation or bylaws;

                  (b)      The waiting period (and any extension thereof)
         applicable to the consummation of the Merger under the HSR Act shall
         have expired or been terminated;

                  (c)      No order shall have been entered and remain in effect
         in any action or proceeding before any foreign, federal or state court
         or governmental agency or other foreign, federal or state regulatory or
         administrative agency or commission that would prevent or make illegal
         the consummation of the Merger;

                  (d)      The Registration Statement shall be effective on the
         Closing Date, and all post-effective amendments filed shall have been
         declared effective or shall have been withdrawn; and no stop order
         suspending the effectiveness thereof shall have been issued and no
         proceedings for that purpose shall have been initiated or, to the
         knowledge of the parties, threatened by the Commission;

                  (e)      There shall have been obtained any and all material
         permits, approvals and consents of securities or blue sky commissions
         of any jurisdiction, and of any other governmental body or agency, that
         reasonably may be deemed necessary so that the consummation of the
         Merger and the transactions contemplated thereby will be in compliance
         with applicable laws, the failure to comply with which would have a
         Material Adverse Effect on Enterra or Weatherford; and

                  (f)      All approvals of private persons, financial
         institutions or corporations, (i) the granting of which is necessary
         for the consummation of the Merger or the transactions contemplated in
         connection therewith and (ii) the non-receipt of which would have a
         Material Adverse Effect on Enterra or Weatherford, shall have been
         obtained.


                                      -37-



         6.2      ADDITIONAL CONDITIONS TO OBLIGATIONS OF WEATHERFORD. The
obligation of Weatherford to effect the Merger is, at the option of Weatherford,
also subject to the fulfillment or waiver at or prior to the Closing Date of the
following conditions:

                  (a)      The representations and warranties of Enterra
         contained in subsections (b), (c), (e) and (g) of Section 2.3 shall be
         accurate, and the representations and warranties of Enterra contained
         in all other subsections of Section 2.3 shall be accurate in all
         material respects (except to the extent qualified by materiality, in
         which case such representations and warranties shall be accurate), as
         of the Closing Date as though such representations and warranties had
         been made at and as of that time (except where any such representation
         or warranty is made as of a date specifically set forth therein); all
         of the terms, covenants and conditions of this Agreement to be complied
         with and performed by Enterra on or before the Closing Date shall have
         been duly complied with and performed in all material respects; and a
         certificate of Enterra to the foregoing effect dated the Closing Date
         and signed by the chief executive officer of Enterra shall have been
         delivered to Weatherford;

                  (b)      Since the date of this Agreement, no Material Adverse
         Change of Enterra shall have occurred, and Weatherford shall have
         received a certificate of Enterra signed by the chief executive officer
         of Enterra dated the Closing Date to such effect;

                  (c)      Weatherford shall have been advised in writing as of
         the date of this Agreement and as of the Closing Date (i) by Arthur
         Andersen LLP that, in accordance with generally accepted accounting
         principles and applicable rules and regulations of the Commission, the
         Merger should be treated as a "pooling of interests" for accounting
         purposes and (ii) by KPMG Peat Marwick LLP that, in accordance with
         generally accepted accounting principles and applicable rules and
         regulations of the Commission, Enterra is a poolable entity;

                  (d)      Enterra shall have received, and furnished written
         copies to Weatherford of, the Enterra affiliates' agreements pursuant
         to Section 4.3;

                  (e)      Weatherford shall have received from Morgan, Lewis &
         Bockius, counsel to Enterra, an opinion dated the Effective Time
         covering the matters set forth in Exhibit 6.2(e);

                  (f)      Weatherford shall have received a copy of the
         "comfort letter" of KPMG Peat Marwick LLP pursuant to Section 5.2(a)
         and on or prior to the Closing Date an additional letter from KPMG Peat
         Marwick LLP dated as of the Closing Date, in form and substance
         reasonably satisfactory to Weatherford, stating that nothing has come
         to their attention, as of a date no earlier than five days prior to the
         Closing Date, which would require any change in their letter delivered
         pursuant to Section 5.2(a) if it were required to be dated and
         delivered on the Closing Date;


                  (g)      The Board of Directors of Weatherford shall have
         received from Merrill Lynch & Co. a written opinion, dated as of the
         date of this Agreement, in form and


                                      -38-



         substance reasonably satisfactory to the Board of Directors of
         Weatherford, to the effect that the consideration to be paid by
         Weatherford pursuant to the Merger is fair to Weatherford from a
         financial point of view, which opinion shall have been confirmed in
         writing to such Board as of the date the Proxy Statement is first
         mailed to the stockholders of Weatherford and not subsequently
         withdrawn;

                  (h)      Weatherford shall have received from Fulbright &
         Jaworski L.L.P., counsel to Weatherford, a written opinion dated as of
         the date that the Proxy Statement is first mailed to stockholders of
         Weatherford to the effect that (i) the Merger will be treated for
         federal income tax purposes as a reorganization within the meaning of
         Section 368(a) of the Code, (ii) Weatherford and Enterra will each be a
         party to that reorganization within the meaning of Section 368(b) of
         the Code and (iii) Weatherford and Enterra shall not recognize any gain
         or loss as a result of the Merger, and such opinion shall not have been
         withdrawn or modified in any material respect;

                  (i)      The Stockholders' Agreement among Enterra, First
         Reserve Corporation and the various First Reserve Funds shall have been
         in full force and effect, and the stockholders of Enterra named therein
         shall not be in breach of any of the material terms thereof,
         immediately prior to the Closing; and

                  (j)      D. Dale Wood shall have entered into definitive
         arrangements reflecting the principal terms set forth in Exhibit 5.20.

         6.3      ADDITIONAL CONDITIONS TO OBLIGATIONS OF ENTERRA. The
obligation of Enterra to effect the Merger is, at the option of Enterra, also
subject to the fulfillment or waiver at or prior to the Closing Date of the
following conditions:

                  (a)      The representations and warranties of Weatherford
         contained in subsections (b), (c), (e) and (g) of Section 2.2 shall be
         accurate, and the representations and warranties of Weatherford
         contained in all other subsections of Section 2.2 shall be accurate in
         all material respects (except to the extent qualified by materiality,
         in which case such representations and warranties shall be accurate, as
         of the Closing Date as though such representations and warranties had
         been made at and as of that time (except where any such representation
         or warranty is made as of a date specifically set forth therein); all
         of the terms, covenants and conditions of this Agreement to be complied
         with and performed by Weatherford on or before the Closing Date shall
         have been duly complied with and performed in all material respects;
         and a certificate of Weatherford to the foregoing effect dated the
         Closing Date and signed by the chief executive officer of Weatherford
         shall have been delivered to Enterra;

                  (b)      Since the date of this Agreement, no Material Adverse
         Change of Weatherford shall have occurred, and Enterra shall have
         received a certificate of Weatherford signed by the chief executive
         officer of Weatherford dated the Closing Date to such effect;


                                      -39-



                  (c)      Enterra shall have been advised in writing as of the
         date of this Agreement and as of the Closing Date (i) by KPMG Peat
         Marwick LLP that, in accordance with generally accepted accounting
         principles and applicable rules and regulations of the Commission, the
         Merger should be treated as a "pooling of interests" for accounting
         purposes and (ii) by Arthur Andersen LLP that, in accordance with
         generally accepted accounting principles and applicable rules and
         regulations of the Commission, Weatherford is a poolable entity;

                  (d)      Weatherford shall have received, and furnished
         written copies to Enterra of, the Weatherford affiliates' agreements
         pursuant to Section 3.3;

                  (e)      Enterra shall have received from Fulbright & Jaworski
         L.L.P., counsel to Weatherford, an opinion dated the Effective Time
         covering the matters set forth in Exhibit 6.3(e);

                  (f)      Enterra shall have received a copy of the "comfort
         letter" of Arthur Andersen LLP pursuant to Section 5.2(b) and on or
         prior to the Closing Date an additional letter from Arthur Andersen LLP
         dated as of the Closing Date, in form and substance reasonably
         satisfactory to Enterra, stating that nothing has come to their
         attention, as of a date no earlier than five days prior to the Closing
         Date, which would require any change in their letter delivered pursuant
         to Section 5.2(b) if it were required to be dated and delivered on the
         Closing Date;

                  (g)      The Board of Directors of Enterra shall have received
         from Simmons & Company International, Inc. a written opinion, dated as
         of the date of this Agreement, in form and substance reasonably
         satisfactory to the Board of Directors of Enterra, to the effect that
         the consideration to be received by the stockholders of Enterra
         pursuant to the Merger is fair to the stockholders of Enterra from a
         financial point of view, which opinion shall have been confirmed in
         writing to such Board as of the date the Proxy Statement is first
         mailed to the stockholders of Enterra and not subsequently withdrawn;

                  (h)      Enterra shall have received from Morgan, Lewis &
         Bockius,counsel to Enterra, a written opinion dated as of the date that
         the Proxy Statement is first mailed to stockholders of Enterra to the
         effect that (i) the Merger will be treated for federal income tax
         purposes as a reorganization within the meaning of Section 368(a) of
         the Code, (ii) Weatherford and Enterra will each be a party to that
         reorganization within the meaning of Section 368(b) of the Code and
         (iii) the stockholders of Enterra shall not recognize any gain or loss
         as a result of the Merger, other than to the extent such stockholders
         receive cash in lieu of fractional shares, and such opinion shall not
         have been withdrawn or modified in any material respect;

                  (i)      The shares of Weatherford Common Stock to be issued
         upon consummation of the Merger shall have been approved for listing on
         the New York Stock Exchange, subject to official notice of issuance;
         and


                                      -40-



                  (j)      Each of the Weatherford Change of Control Agreements
         set forth on Exhibit 6.3(j)(i) shall be amended, pursuant to the form
         attached hereto as Exhibit 6.3(j)(ii).

                                   ARTICLE VII
                    SPECIAL PROVISIONS AS TO CERTAIN MATTERS

         7.1      NO SOLICITATION BY WEATHERFORD.

                  (a)      Weatherford shall not, nor shall it permit any of its
         subsidiaries to, nor shall it authorize or permit any officer,
         director, employee, investment banker, attorney or other advisor, agent
         or representative of Weatherford or any of its subsidiaries to,
         directly or indirectly, (i) solicit, initiate or encourage the
         submission of any Weatherford Takeover Proposal (as hereinafter
         defined), (ii) enter into any agreement with respect to any
         Weatherford Takeover Proposal, or (iii) participate in any discussions
         or negotiations regarding, or furnish to any person any information
         with respect to, the making of any proposal that constitutes, or may
         reasonably be expected to lead to, any Weatherford Takeover Proposal;
         PROVIDED, HOWEVER, that prior to the vote of stockholders of
         Weatherford for approval and adoption of this Agreement and the Merger,
         Weatherford may take any actions described in the foregoing clause
         (iii) to the extent that the Board of Directors of Weatherford
         determines, in good faith after consultation with outside counsel, that
         failure to take such actions could reasonably be expected to result in
         a breach of the Board's fiduciary obligations. Without limiting the
         foregoing, it is understood that any violation of the restrictions set
         forth in the preceding sentence by any officer, director or employee of
         Weatherford or any of the Weatherford Subsidiaries or any investment
         banker, attorney or other advisor, agent or representative of
         Weatherford, whether or not such person is purporting to act on behalf
         of Weatherford or otherwise, shall be deemed to be a material breach of
         this Agreement by Weatherford. For purposes of this Agreement, a
         "Weatherford Takeover Proposal" means (i) any proposal or offer, other
         than a proposal or offer by Enterra or any of its affiliates, for a
         merger or other business combination involving Weatherford, (ii) any
         proposal or offer, other than a proposal or offer by Enterra or any of
         its affiliates, to acquire from Weatherford or any of its affiliates in
         any manner, directly or indirectly, more than 30% of the voting stock
         of Weatherford or any Weatherford Subsidiary or a material amount of
         the assets of Weatherford and the Weatherford Subsidiaries, taken as a
         whole, or (iii) any proposal or offer, other than a proposal or offer
         by Enterra or any of its affiliates, to acquire from the stockholders
         of Weatherford by tender offer, exchange offer or otherwise more than
         30% of the outstanding voting stock of Weatherford.

                  (b)      Neither the Board of Directors of Weatherford nor any
         committee thereof shall (i) withdraw or modify, or propose to withdraw
         or modify, in a manner adverse to Enterra the approval or
         recommendation by the Board of Directors of Weatherford or any such
         committee of this Agreement or the Merger or take any action having
         such effect or (ii) approve or recommend, or propose to approve or
         recommend, any Weatherford Takeover Proposal. Notwithstanding the
         foregoing, if


                                      -41-




         the Board of Directors of Weatherford receives a Weatherford Takeover
         Proposal that, in the exercise of its fiduciary obligations (as
         determined in good faith after consultation with outside counsel), it
         determines to be a Weatherford Superior Proposal (as hereinafter
         defined), the Board of Directors of Weatherford may withdraw or modify
         its approval or recommendation of this Agreement or the Merger and may
         (subject to the following sentence) terminate this Agreement, in each
         case at any time after the fifth business day following Enterra's
         receipt of written notice (a "Weatherford Notice of Superior Proposal")
         advising Enterra that the Board of Directors of Weatherford has
         received a Weatherford Takeover Proposal that it has determined to be a
         Weatherford Superior Proposal, specifying the principal terms and
         conditions of such Weatherford Superior Proposal and identifying
         the person making such Weatherford Superior Proposal. Weatherford may
         terminate this Agreement pursuant to the preceding sentence only if the
         stockholders of Weatherford shall not yet have voted upon the Merger
         and Weatherford shall have paid to Enterra the Termination Fee (as
         defined in Section 7.3(a)). Nothing contained herein shall prohibit
         Weatherford from taking and disclosing to its stockholders a position
         contemplated by Rule 14e-2(a) of the Exchange Act provided that
         Weatherford does not withdraw or modify its position with respect to
         the Merger or take any action having such effect or approve or
         recommend a Weatherford Takeover Proposal. For purposes of this
         Agreement, a "Weatherford Superior Proposal" means any bona fide
         Weatherford Takeover Proposal to merge with or acquire, directly or
         indirectly, all of the voting stock then outstanding or all or
         substantially all of the assets of Weatherford, and otherwise on terms
         that the Board of Directors of Weatherford determines in its good faith
         reasonable judgment (based on the written advice of a financial advisor
         of nationally recognized reputation) to be more favorable to
         Weatherford's stockholders than the Merger.

                  (c)      If the Board of Directors of Weatherford or any
         committee thereof shall (i) withdraw or modify, or propose to withdraw
         or modify, in a manner adverse to Enterra the approval or
         recommendation by the Board of Directors of Weatherford or any such
         committee of this Agreement or the Merger or take any action having
         such effect or (ii) approve or recommend, or propose to approve or
         recommend, any Weatherford Takeover Proposal, Enterra may terminate
         this Agreement.

                  (d)      In addition to the obligations of Weatherford set
         forth in Section 7.1(b), Weatherford shall promptly advise Enterra
         orally and in writing of any negotiations or discussions, entered into
         in reliance on the proviso to the first sentence of Section 7.1(a).

         7.2      NO SOLICITATION BY ENTERRA.

                  (a)      Enterra shall not, nor shall it permit any of its
         subsidiaries to, nor shall it authorize or permit any officer,
         director, employee, investment banker, attorney or other advisor, agent
         or representative of Enterra or any of its subsidiaries to, directly or
         indirectly, (i) solicit, initiate or encourage the submission of any
         Enterra Takeover Proposal (as hereinafter defined), (ii) enter into any
         agreement with respect to any Enterra Takeover Proposal, or (iii)
         participate in any discussions or negotiations


                                      -42-



         regarding, or furnish to any person any information with respect to,
         the making of any proposal that constitutes, or may reasonably be
         expected to lead to, any Enterra Takeover Proposal; PROVIDED, HOWEVER,
         that prior to the vote of stockholders of Enterra for approval and
         adoption of this Agreement and the Merger, Enterra may take any actions
         described in the foregoing clause (iii) to the extent that the Board of
         Directors of Enterra determines, in good faith after consultation with
         outside counsel, that failure to take such actions could reasonably be
         expected to result in a breach of the Board's fiduciary obligations.
         Without limiting the foregoing, it is understood that any violation of
         the restrictions set forth in the preceding sentence by any officer,
         director or employee of Enterra or any of the Enterra Subsidiaries or
         any investment banker, attorney or other advisor, agent or
         representative of Enterra, whether or not such person is purporting to
         act on behalf of Enterra or otherwise, shall be deemed to be a material
         breach of this Agreement by Enterra. For purposes of this Agreement, an
         "Enterra Takeover Proposal" means (i) any proposal or offer, other than
         a proposal or offer by Weatherford or any of its affiliates, for a
         merger or other business combination involving Enterra, (ii) any
         proposal or offer, other than a proposal or offer by Weatherford or any
         of its affiliates, to acquire from Enterra or any of its affiliates in
         any manner, directly or indirectly, more than 30% of the voting stock
         of Enterra or any Enterra Subsidiary or a material amount of the assets
         of Enterra and the Enterra Subsidiaries, taken as a whole, or (iii) any
         proposal or offer, other than a proposal or offer by Weatherford or any
         of its affiliates, to acquire from the stockholders of Enterra by
         tender offer, exchange offer or otherwise more than 30% of the
         outstanding voting stock of Enterra.

                  (b)      Neither the Board of Directors of Enterra nor any
         committee thereof shall (i) withdraw or modify, or propose to withdraw
         or modify, in a manner adverse to Weatherford the approval or
         recommendation by the Board of Directors of Enterra or any such
         committee of this Agreement or the Merger or take any action having
         such effect or (ii) approve or recommend, or propose to approve or
         recommend, any Enterra Takeover Proposal. Notwithstanding the
         foregoing, if the Board of Directors of Enterra receives an Enterra
         Takeover Proposal that, in the exercise of its fiduciary obligations
         (as determined in good faith after consultation with outside counsel),
         it determines to be an Enterra Superior Proposal (as hereinafter
         defined), the Board of Directors of Enterra may withdraw or modify its
         approval or recommendation of this Agreement or the Merger and may
         (subject to the following sentence) terminate this Agreement, in each
         case at any time after the fifth business day following Weatherford's
         receipt of written notice (an "Enterra Notice of Superior Proposal")
         advising Weatherford that the Board of Directors of Enterra has
         received an Enterra Takeover Proposal that it has determined to be an
         Enterra Superior Proposal, specifying the principal terms and
         conditions of such Enterra Superior Proposal and identifying the person
         making such Enterra Superior Proposal. Enterra may terminate this
         Agreement pursuant to the preceding sentence only if the stockholders
         of Enterra shall not yet have voted upon the Merger and Enterra shall
         have paid to Weatherford the Termination Fee. Nothing contained herein
         shall prohibit Enterra from taking and disclosing to its stockholders a
         position contemplated by Rule 14e-2(a) of the Exchange Act provided
         that Enterra does not withdraw or modify its position with respect to
         the


                                      -43-



         Merger or take any action having such effect or approve or recommend an
         Enterra Takeover Proposal. For purposes of this Agreement, an "Enterra
         Superior Proposal" means any bona fide Enterra Takeover Proposal to
         merge with or acquire, directly or indirectly, all of the voting stock
         then outstanding or all or substantially all of the assets of Enterra,
         and otherwise on terms that the Board of Directors of Enterra
         determines in its good faith reasonable judgment (based on the written
         advice of a financial advisor of nationally recognized reputation) to
         be more favorable to Enterra's stockholders than the Merger.

                  (c)      If the Board of Directors of Enterra or any committee
         thereof shall (i) withdraw or modify, or propose to withdraw or modify,
         in a manner adverse to Weatherford the approval or recommendation by
         the Board of Directors of Enterra or any such committee of this
         Agreement or the Merger or take any action having such effect or (ii)
         approve or recommend, or propose to approve or recommend, any Enterra
         Takeover Proposal, Weatherford may terminate this Agreement.

                  (d)      In addition to the obligations of Enterra set forth
         in Section 7.2(b), Enterra shall promptly advise Weatherford orally and
         in writing of any negotiations or discussions, entered into in reliance
         on the proviso to the first sentence of Section 7.2(a).

         7.3      FEE AND EXPENSE REIMBURSEMENTS.

                  (a)      Weatherford agrees to pay Enterra a fee in
         immediately available funds of $20,000,000 (the "Termination Fee")
         promptly upon the termination of this Agreement if this Agreement is
         terminated by Enterra or Weatherford pursuant to Section 8.1(j).
         Further, Weatherford agrees to pay Enterra the Termination Fee if:

                           (i)     this Agreement is terminated for any reason
                  other than a material breach by Enterra and, after the date
                  hereof and before such termination, a Weatherford Takeover
                  Proposal shall have been made and the stockholders of
                  Weatherford shall not have approved the Merger; or

                           (ii)    Weatherford shall have terminated this
                  Agreement pursuant to Section 8.1(c) or Section 8.1(h) and,
                  within six months after such termination, Weatherford shall
                  have entered into a definitive agreement with any person
                  (other than Enterra or any of its affiliates) with respect to
                  a Weatherford Takeover Proposal than is more favorable to
                  Weatherford's stockholders that the Merger.

         The Termination Fee shall be payable promptly upon termination of this
         Agreement if any of the events described in Section 7.3(a) (i) shall
         have occurred prior to termination. The Termination Fee payable
         pursuant to Section 7.3(a) (ii) shall be payable promptly upon the
         first occurrence of the event following termination of this Agreement.


                                      -44-



                  (b)      Enterra agrees to pay Weatherford the Termination Fee
         promptly upon the termination of this Agreement if this Agreement is
         terminated by Enterra or Weatherford pursuant to Section 8.1(k).
         Further, Enterra agrees to pay Weatherford the Termination Fee if:

                           (i)     this Agreement is terminated for any reason
                  other than a material breach by Weatherford and, after the
                  date hereof and before such termination, an Enterra Takeover
                  Proposal shall have been made and the stockholders of Enterra
                  shall not have approved the Merger; or

                           (ii)    Enterra shall have terminated this Agreement
                  pursuant to Section 8.1(d) or Section 8.1(i) and, within six
                  months after such termination, Enterra shall have entered into
                  a definitive agreement with any person (other than Weatherford
                  or any of its affiliates) with respect to an Enterra Takeover
                  Proposal that is more favorable to Enterra's stockholders than
                  the Merger.

         The Termination Fee shall be payable promptly upon termination of this
         Agreement if any of the events described in Section 7.3(b) (i) shall
         have occurred prior to termination. The Termination Fee payable
         pursuant to Section 7.3(b) (ii) shall be payable promptly upon the
         first occurrence of the event following termination of this Agreement.

                                  ARTICLE VIII
                                  MISCELLANEOUS

         8.1      TERMINATION.  This Agreement may be terminated and the Merger
and the other transactions contemplated herein may be abandoned at any time
prior to the Effective Time, whether prior to or after approval by the
stockholders of Weatherford or the stockholders of Enterra:

                  (a)      by mutual consent of Weatherford and Enterra;

                  (b)      by either Weatherford or Enterra if the Merger has
         not been effected on or before December 31, 1995;

                  (c)      by Weatherford if the condition set forth in Section
         6.2(g) is not satisfied;

                  (d)      by Enterra if the condition set forth in Section
         6.3(g) is not satisfied;

                  (e)      by Weatherford if a final, unappealable order shall
         have been entered to restrain, enjoin or otherwise prevent, or awarding
         substantial damages in connection with, a consummation of this
         Agreement or the transactions contemplated in connection herewith, or
         there is pending by any governmental body any suit challenging or
         seeking to restrain or prohibit the consummation of the Merger or any
         of the other transactions contemplated by this Agreement or seeking to
         obtain from


                                      -45-



         Enterra or any of the Enterra Subsidiaries any damages that are
         material in relation to Enterra and the Enterra Subsidiaries, taken as
         a whole;

                  (f)      by Enterra if a final, unappealable order shall have
         been entered to restrain, enjoin or otherwise prevent, or awarding
         substantial damages in connection with, a consummation of this
         Agreement or the transactions contemplated in connection herewith, or
         there is pending by any governmental body any suit challenging or
         seeking to restrain or prohibit the consummation of the Merger or any
         of the other transactions contemplated by this Agreement or seeking to
         obtain from Weatherford or any of the Weatherford Subsidiaries any
         damages that are material in relation to Weatherford and the
         Weatherford Subsidiaries, taken as a whole;

                  (g)      by either Weatherford or Enterra if the required
         approval of the stockholders of Enterra or the stockholders of
         Weatherford for the adoption and approval of the Merger and this
         Agreement is not received at their respective stockholders' meetings;

                  (h)      by Weatherford if (i) since the date of this
         Agreement there has been a Material Adverse Change in Enterra or (ii)
         there has been a breach of any representation or warranty set forth in
         subsection (b), (c), (e) or (g) of Section 2.2, or there has been a
         breach of any other subsection of Section 2.2 in any material respect
         (except to the extent qualified by materiality, in which case such
         representations and warranties shall not have been breached in any
         respect), by Enterra or Enterra fails to perform in any material
         respect any of its covenants, agreements or obligations under this
         Agreement;

                  (i)      by Enterra if (i) since the date of this Agreement
         there has been a Material Adverse Change in Weatherford or (ii) there
         has been a breach of any representation or warranty set forth in
         subsection (b), (c), (e) or (g) of Section 2.3, or there has been a
         breach of any other subsection of Section 2.3 in any material respect
         (except to the extent qualified by materiality, in which case such
         representations and warranties shall not have been breached in any
         respect), by Weatherford or Weatherford fails to perform in any
         material respect any of its covenants, agreements or obligations under
         this Agreement;

                  (j)      by Weatherford or Enterra to the extent permitted
         under Section 7.1; or

                  (k)      by Weatherford or Enterra to the extent permitted
         under Section 7.2.

         8.2      EFFECT OF TERMINATION. In the event of any termination of this
Agreement pursuant to Section 8.1, Weatherford and Enterra shall have no
obligation or liability to each other except that (i) the provisions of Sections
5.8 and 7.3, this Article VIII and the obligations set forth in the
Confidentiality Agreement dated May 12, 1995, between Weatherford and Enterra
(the "Confidentiality Agreement") shall survive any such termination, and (ii)
in the case of termination pursuant to Section 8.1(h) or 8.1(i) only, nothing
herein and no


                                      -46-



termination pursuant to such sections will relieve any party from liability for
any breach of this Agreement.

         8.3      WAIVER AND AMENDMENT. Any provision of this Agreement may be
waived at any time by the party that is, or whose stockholders are, entitled to
the benefits thereof. This Agreement may not be amended or supplemented at any
time, except by an instrument in writing signed on behalf of each party hereto;
PROVIDED that after this Agreement has been approved and adopted by the
stockholders of Weatherford and the stockholders of Enterra, this Agreement may
be amended only as may be permitted by applicable provisions of the DGCL. The
waiver by any party hereto of any condition or of a breach of another provision
of this Agreement shall not operate or be construed as a waiver of any other
condition or subsequent breach. The waiver by any party hereto of any of the
conditions precedent to its obligations under this Agreement shall not preclude
it from seeking redress for breach of this Agreement other than with respect to
the condition so waived.

         8.4      NONSURVIVAL OF REPRESENTATIONS, WARRANTIES, COVENANTS AND
AGREEMENTS. None of the representations, warranties, covenants or agreements in
this Agreement or in any instrument delivered pursuant to this Agreement shall
survive the Effective Time, except for the terms of Article I, Sections 5.4,
5.7, 5.8, 5.9, 5.10, 5.12, 5.13, 5.18, 5.19(b) and 5.22, this Article VIII and
the agreements of the "affiliates" of Enterra and Weatherford delivered pursuant
to Section 6.2(d) and Section 6.3(d), respectively.

         8.5      PUBLIC STATEMENTS. Enterra and Weatherford agree to consult
with each other prior to issuing any press release or otherwise making any
public statement with respect to the transactions contemplated hereby, and shall
not issue any such press release or make any such public statement prior to such
consultation, except as may be required by law or applicable stock exchange
policy.

         8.6      BINDING EFFECT; ASSIGNMENT. This Agreement shall inure to the
benefit of and will be binding upon the parties hereto and their respective
legal representatives, successors and permitted assigns. This Agreement shall
not be assignable by the parties hereto.

         8.7      NOTICES. All notices, requests, demands, claims and other
communications that are required to be or may be given under this Agreement
shall be in writing and shall be deemed to have been duly given if (a) delivered
in person or by courier, (b) sent by facsimile transmission, answer back
requested, or (c) mailed, certified first class mail, postage prepaid, return
receipt requested, to the parties hereto at the following addresses:

                  if to Enterra:        Enterra Corporation
                                        13100 Northwest Freeway, Sixth Floor
                                        Houston, Texas 77040
                                        Attention:  D. Dale Wood, Chairman of
                                           the Board, President and Chief
                                           Executive Officer
                                        Fax:  (713) 462-7816


                                      -47-





        with a required copy to:        Morgan, Lewis & Bockius
                                        2000 One Logan Square
                                        Philadelphia, Pennsylvania 19103-6993
                                        Attention:  David R. King
                                        Fax:  (215) 963-5299

        if to Weatherford:              Weatherford International Incorporated
                                        1360 Post Oak Boulevard, Suite 1000
                                        Houston, Texas 77056-3098
                                        Attention:  Philip Burguieres, Chairman
                                            of the Board, President and Chief
                                            Executive Officer
                                        Fax:  (713) 439-1152

        with a required copy to:        Fulbright & Jaworski L.L.P.
                                        1301 McKinney, Suite 5100
                                        Houston, Texas 77010-3095
                                        Attention:  Charles L. Strauss
                                        Fax:  (713) 651-5246

or to such other address or facsimile number as any party shall have furnished
to the other by notice given in accordance with this Section 8.7. Such notices
shall be effective, (i) if delivered in person or by courier, upon actual
receipt by the intended recipient, (ii) if sent by facsimile transmission, when
the answer back is received, or (iii) if mailed, upon the earlier of five days
after deposit in the mail and the date of delivery as shown by the return
receipt therefor.

         8.8      GOVERNING LAW; JURISDICTION. THIS AGREEMENT, THE SUBJECT
MATTER HEREOF AND ALL OF THE TRANSACTIONS CONTEMPLATED HEREBY SHALL BE GOVERNED
IN ALL RESPECTS, INCLUDING, WITHOUT LIMITATION, VALIDITY, INTERPRETATION AND
EFFECT, BY THE LAWS OF THE STATE OF DELAWARE. EACH PARTY HERETO IRREVOCABLY
SUBMITS TO THE EXCLUSIVE JURISDICTION OF ANY COURT OF COMPETENT JURISDICTION IN
THE STATE OF DELAWARE AND THE UNITED STATES DISTRICT COURT FOR THE DISTRICT OF
DELAWARE, AND ANY OTHER COURT OF THE STATE OF DELAWARE AND THE UNITED STATES
WITH JURISDICTION TO HEAR APPEALS FROM ANY SUCH COURT, FOR THE PURPOSES OF ANY
SUIT, ACTION OR OTHER PROCEEDING OF ANY TYPE WHATSOEVER ARISING OUT OF THIS
AGREEMENT OR THE SUBJECT MATTER HEREOF OR ANY OF THE TRANSACTIONS CONTEMPLATED
HEREBY BROUGHT BY ANY PARTY, AND TO THE EXTENT PERMITTED BY APPLICABLE LAW,
HEREBY WAIVES, AND AGREES NOT TO ASSERT, BY WAY OF MOTION, AS A DEFENSE, OR
OTHERWISE, IN ANY SUCH SUIT, ACTION OR PROCEEDING ANY CLAIM THAT SUCH PARTY IS
NOT PERSONALLY SUBJECT TO THE JURISDICTION OF THE ABOVE-NAMED COURTS, THAT THE
SUIT, ACTION OR PROCEEDING IS BROUGHT IN AN INCONVENIENT FORUM, THAT THE VENUE
OF THE SUIT, ACTION OR PROCEEDING IS IMPROPER OR THAT THIS AGREEMENT, OR THE
SUBJECT


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MATTER HEREOF MAY NOT BE ENFORCED IN OR BY SUCH COURT. EACH PARTY HERETO FURTHER
AGREES NOT TO BRING OR PURSUE ANY SUCH SUIT, ACTION OF OTHER PROCEEDING IN ANY
OTHER COURTS OR JURISDICTION.

         8.9      SEVERABILITY. If any term, provision, covenant or restriction
of this Agreement is held by a court of competent jurisdiction to be invalid,
void or unenforceable, the remainder of the terms, provisions, covenants and
restrictions of this Agreement shall continue in full force and effect and shall
in no way be affected, impaired or invalidated.

         8.10     COUNTERPARTS. This Agreement may be executed in counterparts,
each of which shall be an original, but all of which together shall constitute
one and the same agreement.

         8.11     HEADINGS.  The Section headings herein are for convenience
only and shall not affect the construction hereof.

         8.12     ENTIRE AGREEMENT; THIRD PARTY BENEFICIARIES. This Agreement,
the exhibits attached hereto, the Weatherford Disclosure Letter (and Schedule
2.2(n) thereto), the Enterra Disclosure Letter (and the exhibits attached
thereto) and the Confidentiality Agreement constitute the entire agreement and
supersedes all other prior agreements and understandings, both oral and written,
among the parties or any of them, with respect to the subject matter hereof and
neither this nor any documents delivered in connection with this Agreement
confers upon any person not a party hereto any rights or remedies hereunder
except as provided in Sections 5.9, 5.12, 5.13, 5.18 and 5.19(b).


                                      -49-



         IN WITNESS WHEREOF, each of the parties has caused this Agreement to be
executed on its behalf by its officers thereunto duly authorized, all as of the
date first above written.

                                 WEATHERFORD INTERNATIONAL INCORPORATED



                                 By: /s/ Phillip Burguieres
                                    -------------------------------------------
                                                 Philip Burguieres
                                        Chairman of the Board, President and
                                              Chief Executive Officer


                                 ENTERRA CORPORATION



                                 By: /s/ D. Dale Wood
                                    -------------------------------------------
                                                    D. Dale Wood
                                          Chairman of the Board, President and
                                               Chief Executive Officer


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