EXHIBIT 5.1


                           PORTER & HEDGES, L.L.P.
                       ATTORNEYS AND COUNSELORS AT LAW
                          700 LOUISIANA, 35TH FLOOR
                          HOUSTON, TEXAS 77002-2764
                         ---------------------------
                          TELECOPIER (713) 228-1331          MAILING ADDRESS:
                          TELEPHONE (713) 226-0600            P.O. BOX 4744
                                                          HOUSTON, TX 77210-4744



                                March 9, 2004

Grey Wolf, Inc.
10370 Richmond Avenue, Suite 600
Houston, Texas 77042

Ladies and Gentlemen:

         We have acted as counsel for Grey Wolf, Inc., a Texas corporation (the
"Company"), and the Subsidiary Guarantors (as defined below) in connection with
the registration under the Securities Act of 1933, as amended (the "Securities
Act"), on a Registration Statement on Form S-3 (the "Registration Statement") of
the offer and sale from time to time pursuant to Rule 415 under the Securities
Act of up to $500,000,000 of (i) debt securities of the Company ("Debt
Securities"); (ii) shares of common stock, par value $.01 per share, of the
Company ("Common Stock"); (iii) shares of preferred stock, par value $1.00 per
share, of the Company ("Preferred Stock"); (iv) depositary shares representing
fractional interests in Preferred Stock ("Depositary Shares"); (v) purchase
contracts (the "Purchase Contracts") requiring the holders thereof to purchase
Securities (as defined below); (vi) units (the "Units") consisting of Debt
Securities, Common Stock, Preferred Stock, Warrants (as defined below), Purchase
Contracts or any combination of the foregoing; (vii) warrants to purchase Debt
Securities, Preferred Stock, Common Stock, Purchase Contracts or Units (the
"Warrants"); and (viii) guaranties of Debt Securities, Warrants, Purchase
Contracts and Units (the "Guarantees" and together with the Debt Securities,
Common Stock, Preferred Stock, Depositary Shares, Purchase Contracts, Units and
Warrants, the "Securities") that may be issued from time to time by DI Energy,
Inc., DI/Perfensa, Inc., Drillers, Inc., DI de Venezuela, C.A., Grey Wolf, LLC,
Grey Wolf Drilling Company, L.P., Grey Wolf Drilling de Mexico, S. de R.L. de
C.V., Grey Wolf Drilling de Venezuela, C.A., Grey Wolf Drilling International,
Ltd., Grey Wolf Holdings Company, Grey Wolf International, Inc., Grey Wolf
International de Mexico, S. de R.L. de C.V., Grey Wolf Mexico Holdings, LLC,
Murco Drilling Corporation, Perforaciones Andinas, S.A. and Servicios Grey Wolf,
S. de R.L. de C.V. (collectively, the "Subsidiary Guarantors").

         We have examined those records and documents as we have deemed
necessary, including but not limited to (i) the amended and restated Articles of
Incorporation (the "Articles of Incorporation") and the Bylaws of the Company,
(ii) the corporate proceedings of the Company and the Subsidiary Guarantors, and
(iii) the forms of indentures filed as Exhibits 4.3 and 4.4 to the Registration
Statement (the "Indentures").


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         As to certain questions of fact material to our opinions that we have
not independently established we have relied upon certificates from officers of
the Company and upon certificates of public officials.

         In rendering the following opinions, we have assumed (i) all
information contained in all documents reviewed by us is true and correct, (ii)
the genuineness of all signatures on all documents reviewed by us, (iii) the
authenticity and completeness of all documents submitted to us as originals,
(iv) the conformity to authentic originals of all documents submitted to us as
certified or photostatic copies, and (v) each natural person signing any
document reviewed by us had the legal capacity to do so.

         Based on the foregoing, and subject to the assumptions, exceptions and
qualifications stated below, we are of the opinion that:

         1.       With respect to Debt Securities to be issued under the
                  Indentures, when (a) the applicable Indenture and any
                  supplemental Indentures have been duly authorized and validly
                  executed and delivered by the trustee, the Company and the
                  Subsidiary Guarantors, if any, (b) the Company's Board of
                  Directors or, to the extent permitted by Article 2.36 of the
                  Texas Business Corporation Act (the "TBCA"), a duly
                  constituted and acting committee thereof (such Board of
                  Directors or committee being hereinafter referred to as the
                  "Board") has taken all necessary corporate action to authorize
                  the issuance and terms of such Debt Securities, the terms of
                  the offering thereof and related matters, and (c) such Debt
                  Securities have been duly executed, authenticated, issued and
                  delivered in accordance with the provisions of the applicable
                  Indenture and any applicable supplemental Indenture and upon
                  payment of the consideration therefor such Debt Securities
                  will be legally issued and will constitute valid and binding
                  obligations of the Company, enforceable against the Company in
                  accordance with their terms.

         2.       With respect to Guarantees of Debt Securities issued by a
                  Subsidiary Guarantor (a "Debt Guarantee"), when (a) the
                  Indentures and any applicable supplemental Indentures have
                  been duly authorized, executed and delivered by the trustee,
                  the Company and the Subsidiary Guarantors, (b) all necessary
                  corporate or other action has been taken to authorize the
                  issuance and the specific terms of such Debt Guarantees, the
                  terms of the offering thereof and related matters, and (c)
                  such Debt Guarantees have been duly authorized, executed,
                  authenticated, issued and delivered in accordance with the
                  applicable Indenture and the applicable underwriting or other
                  agreement and upon payment of the consideration therefor, such
                  Debt Guarantees will constitute valid and binding obligations
                  of the Subsidiary Guarantors, enforceable against the
                  Subsidiary Guarantors in accordance with their terms.

         3.       With respect to shares of Common Stock, when both (a) the
                  Board has taken all necessary corporate action to authorize
                  the issuance of and the terms of the offering of the shares of
                  Common Stock and related matters and (b) certificates

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                  representing the shares of Common Stock have been duly
                  executed, countersigned, registered and delivered either (i)
                  in accordance with the applicable definitive purchase,
                  underwriting or similar agreement approved by the Company's
                  Board upon payment of the consideration therefor (not less
                  than the par value of the Common Stock) provided for therein
                  or (ii) upon conversion or exercise of any other Security, in
                  accordance with the terms of such Security or the instrument
                  governing such Security providing for such conversion or
                  exercise as approved by the Board, for the consideration
                  approved by the Board (not less than the par value of the
                  Common Stock), then the shares of Common Stock will be validly
                  issued, fully paid and nonassessable.

         4.       With respect to shares of Preferred Stock, when both (a) the
                  Board has taken all necessary corporate action to authorize
                  the issuance and terms of the shares of Preferred Stock, the
                  terms of the offering thereof, and related matters, including
                  the adoption of a statement of resolution relating to such
                  Preferred Stock as required by the TBCA (a "Statement of
                  Resolution") and the filing of the Statement of Resolution
                  with the Secretary of State of the State of Texas, and (b)
                  certificates representing the shares of Preferred Stock have
                  been duly executed, countersigned, registered and delivered
                  either (i) in accordance with the applicable definitive
                  purchase, underwriting or similar agreement approved by the
                  Board upon payment of the consideration therefor (not less
                  than the par value of the Preferred Stock) provided for
                  therein or (ii) upon conversion or exercise of any other
                  Security, in accordance with the terms of such Security or the
                  instrument governing such Security providing for such
                  conversion or exercise as approved by the Board, for the
                  consideration approved by the Board (not less than the par
                  value of the Preferred Stock), then the shares of Preferred
                  Stock will be validly issued, fully paid and non-assessable.

         5.       With respect to Depositary Shares, when (a) the Board has
                  taken all necessary corporate action to authorize the issuance
                  and terms of the Depositary Shares, the terms of the offering
                  thereof, and related matters, including the adoption of a
                  Statement of Resolution relating to the Preferred Stock
                  underlying such Depositary Shares and the filing of the
                  Statement of Resolution with the Secretary of State of the
                  State of Texas, (b) the Depositary Agreement or Agreements
                  relating to the Depositary Shares and the related Depositary
                  Receipts have been duly authorized and validly executed and
                  delivered by the Company and the Depositary appointed by the
                  Company, (c) the shares of Preferred Stock underlying such
                  Depositary Shares have been deposited with a bank or trust
                  company (which meets the requirements for the Depositary set
                  forth in the Registration Statement) under the applicable
                  Depositary Agreements, and (d) the Depositary Receipts
                  representing the Depositary Shares have been duly executed,
                  countersigned, registered and delivered in accordance with the
                  appropriate Depositary Agreement and the applicable definitive
                  purchase, underwriting or


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                  similar agreements approved by the Board upon payment of the
                  consideration therefor provided for therein, the Depositary
                  Shares will be validly issued.

         6.       With respect to the Warrants, when (a) the Board has taken all
                  necessary corporate action to authorize the creation of and
                  the issuance and terms of the Warrants, the terms of the
                  offering thereof, and related matters (b) the warrant
                  agreement or agreements relating to the Warrants have been
                  duly authorized and validly executed and delivered by the
                  Company and the warrant agent appointed by the Company, and
                  (c) the Warrants and certificates representing the Warrants
                  have been duly executed, countersigned, registered and the
                  applicable definitive purchase, underwriting or similar
                  agreement approved by the Company's Board upon payment of the
                  consideration therefor provided for therein, the Warrants will
                  be legally issued and will constitute valid and binding
                  obligations of the Company.

         7.       With respect to Purchase Contracts, when (a) the Board has
                  taken all necessary corporate action to authorize the issuance
                  and the specific terms of such Purchase Contracts, the terms
                  of the offering thereof and related matters, and (b) such
                  Purchase Contracts and agreements relating to the Purchase
                  Contracts have been duly executed and delivered and duly
                  issued and sold in the in the manner contemplated in the
                  Registration Statement or any prospectus supplement thereto,
                  such Purchase Contracts will be valid and binding obligations
                  of the Company.

         8.       With respect to Units, when (a) the Board has taken all
                  necessary corporate action to authorize the issuance and the
                  specific terms of such Units, the terms of the offering
                  thereof and related matters, and (b) such Units and agreements
                  relating to the Units have been duly executed and delivered
                  and duly issued and sold in the manner contemplated in the
                  Registration Statement or any prospectus supplement, such
                  Units will be valid and binding obligations of the Company.

         9.       With respect to Guarantees of Warrants, Purchase Contracts or
                  Units (the "Additional Guarantees"), when (a) all necessary
                  corporate or other action has been taken to authorize the
                  issuance and the specific terms of such Additional Guarantees,
                  the terms of the offering thereof and related matters and (b)
                  the applicable guarantee agreement has been duly executed and
                  delivered and the applicable Warrants, Purchase Contracts
                  and/or Units, as the case may be, have been duly issued and
                  delivered by the Company, such Additional Guarantees will
                  constitute valid and binding obligations of the Subsidiary
                  Guarantors.

         The opinions expressed above are subject in all respects to the
following assumptions, exceptions and qualifications:

                  a.       We have assumed that: (i) the Registration Statement
                           and any amendments thereto (including post-effective
                           amendments) will have become effective and will
                           comply with all applicable provisions of the


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                           Securities Act and such state securities rules,
                           regulations and laws as may be applicable, and the
                           Indenture has been qualified under the Trust
                           Indenture Act of 1939, as amended (the "TIA"), (ii)
                           the Registration Statement will remain effective and
                           comply with all applicable provisions of the
                           Securities Act and such state securities rules,
                           regulations and laws as may be applicable at the time
                           the Securities are offered or issued as contemplated
                           by the Registration Statement; (iii) a prospectus
                           supplement will have been prepared and filed with the
                           Securities and Exchange Commission (the "Commission")
                           describing the Securities offered thereby and will
                           comply with the Securities Act and all applicable
                           state securities rules, regulations and laws; (iv)
                           all Securities will be issued and sold in compliance
                           with the Securities Act, the Securities Exchange Act
                           of 1934, as amended, and all applicable state
                           securities rules, regulations and laws and in the
                           manner stated in the Registration Statement and the
                           appropriate prospectus supplement; (v) a definitive
                           purchase, underwriting or similar agreement with
                           respect to any Securities offered or issued will have
                           been duly authorized and validly executed and
                           delivered by the Company and the other parties
                           thereto; (vi) any Securities issuable upon
                           conversion, exchange or exercise of any Security
                           being offered or issued will be duly authorized,
                           created and, if appropriate, reserved for issuance
                           upon such conversion, exchange or exercise; (vii)
                           there shall not have occurred any change in law
                           affecting the validity or enforceability of any such
                           Security; and (viii) none of the terms of any
                           Security to be established subsequent to the date
                           hereof, nor the issuance and delivery of any such
                           Security nor the compliance by the Company and the
                           Subsidiary Guarantors with the terms of such Security
                           will violate any applicable law or will result in
                           violation of any provision of any instrument or
                           agreement then binding on the Company or any of the
                           Subsidiary Guarantors, or will violate any
                           restriction imposed by a court or governmental body
                           having jurisdiction over the Company or any
                           Subsidiary Guarantor.

                  b.       In rendering the opinions in paragraphs 1 and 2, we
                           have assumed that the trustee is or, at the time the
                           applicable Indenture is signed, will be qualified to
                           act as trustee under the Indenture and the TIA and
                           that the trustee has or will have duly executed and
                           delivered the Indenture.

                  c.       The enforceability of the Indentures and provisions
                           thereof may be limited by bankruptcy, insolvency,
                           reorganization, fraudulent transfer, moratorium or
                           other similar laws now or hereinafter in effect
                           relating to or affecting enforcement of creditors
                           rights generally and by general principles of equity
                           (regardless of whether such enforcement is considered
                           in a proceeding in equity or at law). Such principles
                           of equity include, without limitation, concepts of
                           materiality, reasonableness, good faith

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                           and fair dealing, and also the possible
                           unavailability of specific performance or injunctive
                           relief.

                  d.       We express no opinion with respect to (i) the
                           enforceability of the provisions in the Indentures,
                           or any other agreement or instrument with respect to
                           delay or omission of enforcement of rights or
                           remedies, or waivers of notices or defenses, or
                           waivers of benefits of or other rights that cannot be
                           effectively waived under, applicable laws; (ii) the
                           enforceability of indemnification provisions to the
                           extent they purport to relate to liabilities
                           resulting from enforceability of indemnification
                           provisions to the extent they purport to relate to
                           liabilities resulting from or based upon negligence
                           or any violation of federal or state securities laws
                           or blue sky laws or (iii) the enforceability of
                           Section 110 of the Indentures.

                  e.       The opinions expressed in this letter are limited to
                           the laws of the States of Texas and New York and the
                           federal laws of the United States of America.

         We consent to the use of this opinion as Exhibit 5.1 to the
Registration Statement and to the reference to our firm under the caption "Legal
Matters" in the prospectus included as a part of the Registration Statement. In
giving this consent, we do not admit that this firm is in the category of
persons whose consent is required under Section 7 of the Securities Act of the
rules and regulations of the Commission promulgated thereunder.

         This opinion is rendered on the date hereof and we disclaim any duty to
advise you regarding any changes in the matters addressed herein.

                                             Very truly yours,


                                             /s/ Porter & Hedges, L.L.P.