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                                                                    Exhibit 4.4

                          FIRST SUPPLEMENTAL INDENTURE


         FIRST SUPPLEMENTAL INDENTURE (the "Supplement"), dated as of June 30,
1995, is entered into by and among Energy Ventures, Inc., a Delaware
corporation (the "Company"), Prideco, Inc., a Texas corporation and a wholly
owned subsidiary of the Company (the "New Guarantor"), and Chemical Bank, a New
York corporation, as Trustee (the "Trustee").

                 RECITALS OF THE COMPANY AND THE NEW GUARANTOR

         WHEREAS, the Company, the Subsidiary Guarantors and the Trustee have
executed and delivered an Indenture, dated as of March 15, 1994, among the
Company, the Subsidiary Guarantors and the Trustee (the "Indenture") providing
for the issuance by the Company of $120,000,000 aggregate principal amount of
the Company's 10 1/4% Senior Notes due 2004 (the "Securities") and pursuant to
which the Subsidiary Guarantors have agreed, jointly and severally, to
unconditionally guarantee the due and punctual payment of the principal of,
premium, if any, and interest on the Securities and all other amounts due and
payable under the Indenture and the Securities by the Company ("Indenture
Obligations");

         WHEREAS, the New Guarantor has become a Material Restricted Subsidiary
and pursuant to Sections 12.3(b) and (d) is obligated to enter into the
Supplement thereby guaranteeing the punctual payment of all Indenture
Obligations as provided in Article XII of the Indenture;

         WHEREAS, pursuant to Section 8.1(f) of the Indenture, the Company, the
New Guarantor and the Trustee may enter into this Supplement without the
consent of any Holder;

         WHEREAS, the execution and delivery of this Supplement have been duly
authorized by a Board Resolution of the respective Board of Directors of the
Company and the New Guarantor; and

         WHEREAS, all conditions and requirements necessary to make the
Supplement valid and binding upon the Company and the New Guarantor, and
enforceable against the Company and the New Guarantor in accordance with its
terms, have been performed and fulfilled;

         NOW, THEREFORE, in consideration of the above premises, each of the
parties hereto agrees, for the benefit of the others and for the equal and
proportionate benefit of the Holders of the Securities, as follows:

                                  ARTICLE ONE
                               THE NEW GUARANTEE

         Section 101.  For value received, the New Guarantor, in accordance
with Article Twelve of the Indenture, hereby unconditionally guarantees (the
"New Guarantee"), jointly and severally among itself and the Subsidiary
Guarantors, to the Trustee and the Holders, the due and punctual payment of the
principal of, premium, if any, and interest on the Securities and all other
amounts due and payable under the Indenture and the Securities by the Company,
whether at maturity, by acceleration, redemption, repurchase or otherwise as
more specifically set forth in Section 12.1 of the Indenture, including,
without limitation, interest on the overdue principal of, premium, if any, and
interest on the Securities, to the extent lawful, all in accordance with the
terms of Article XII of the Indenture and subject to the limitations set





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forth in Section 12.5 of the Indenture.  The agreements made and obligations
assumed hereunder by the New Guarantor shall constitute, and shall be deemed to
constitute, a Guarantee under the Indenture and for all purposes of the
Indenture, and New Guarantor shall be considered a Subsidiary Guarantor for all
purposes of the Indenture as if it was originally named therein as a Subsidiary
Guarantor.

         Section 102.  The New Guarantee shall be automatically and
unconditionally released and discharged upon the occurrence of the events set
forth in Sections 3.1 and 12.4 of the Indenture.

                                  ARTICLE TWO
                                 MISCELLANEOUS

         Section 201.  Except as otherwise expressly provided or unless the
context otherwise requires, all terms used herein which are defined in the
Indenture shall have the meanings assigned to them in the Indenture.  Except as
supplemented hereby, the Indenture (including the Guarantees incorporated
therein) and the Securities are in all respects ratified and confirmed and all
the terms and provisions thereof shall remain in full force and effect.

         Section 202.  This Supplement shall be effective as of the execution
and delivery hereof.

         Section 203.  The recitals contained herein shall be taken as the
statements of the Company and the New Guarantor, and the Trustee assumes no
responsibility for the correctness.  The Trustee makes no representations as to
the validity or sufficiency of this Supplement.

         Section 204.  This Supplement shall be governed by and construed in
accordance with the laws of the jurisdiction which govern the Indenture and its
construction.

         Section 205.  This Supplement may be executed in any number of
counterparts each of which shall be an original, but such counterparts shall
together constitute but one and the same instrument.

         IN WITNESS WHEREOF, the parties hereto have caused this Supplement to
be duly executed and their respective seals to be affixed hereunto and duly
attested all as of the day and year first above written.

                                        ENERGY VENTURES, INC.
[Corporate Seal]

                                        By:  /s/  JAMES G. KILEY
                                           -----------------------------
                                                  James G. Kiley
Attest:                                           Vice President


    /s/ FRANCES R. POWELL
----------------------------
        Frances R. Powell
       Assistant Secretary
     




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                                        PRIDECO, INC.
[Corporate Seal]

                                        By:   /s/ JAMES G. KILEY
                                           ---------------------------
                                                  James G. Kiley
Attest:                                           Vice President


    /s/ FRANCES R. POWELL
-----------------------------
        Frances R. Powell
       Assistant Secretary


                                        CHEMICAL BANK
[Corporate Seal]

                                        By:   /s/ W. B. DODGE
                                           ----------------------
                                                  W. B. Dodge
                                                  Vice President
Attest:



    /s/ Glenn G. McKeever
----------------------------------
        Assistant Secretary





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