1 EXHIBIT 3.5 PAGE 1 STATE OF DELAWARE OFFICE OF THE SECRETARY OF STATE ------------------------------------ I, EDWARD J. FREEL, SECRETARY OF STATE OF THE STATE OF DELAWARE, DO HEREBY CERTIFY THE ATTACHED IS A TRUE AND CORRECT COPY OF THE CERTIFICATE OF AGREEMENT OF MERGER, WHICH MERGES: "MWJR PETROLEUM CORPORATION", A DELAWARE CORPORATION, WITH AND INTO "APACHE CORPORATION" UNDER THE NAME OF" APACHE CORPORATION", A CORPORATION ORGANIZED AND EXISTING UNDER THE LAWS OF THE STATE OF DELAWARE, AS RECEIVED AND FILED IN THIS OFFICE THE NINETEENTH DAY OF AUGUST, A.D. 1998, AT 8:30 O'CLOCK A.M. AND I DO HEREBY FURTHER CERTIFY THAT THE EFFECTIVE DATE OF THE AFORESAID CERTIFICATE OF AGREEMENT OF MERGER IS THE FIRST DAY OF SEPTEMBER, A.D. 1998. A FILED COPY OF THIS CERTIFICATE HAS BEEN FORWARDED TO THE NEW CASTLE COUNTY RECORDER OF DEEDS. /s/ Edward J. Freel ----------------------------------------- Edward J. Freel, Secretary of State [SEAL] 0482215 8100M AUTHENTICATION: 9260798 981324877 DATE: 08-19-98 2 AGREEMENT AND PLAN OF MERGER BETWEEN APACHE CORPORATION AND MWJR PETROLEUM CORPORATION AGREEMENT AND PLAN OF MERGER ("Agreement"), dated this 7th day of August, 1998, pursuant to Section 251 of the General Corporation Law of the State of Delaware, between Apache Corporation, a Delaware corporation, and MWJR Petroleum Corporation, a Delaware corporation (together, the "Constituent Corporations"). WITNESSETH that: WHEREAS, both of the Constituent Corporations desire to merge into a single corporation; and NOW THEREFORE, the corporations, parties to this Agreement, in consideration of the mutual covenants, agreements and provisions hereinafter contained do hereby prescribe the terms and conditions of said merger and the mode of carrying the same into effect as follows: FIRST: MWJR Petroleum Corporation (the "Merged Corporation") at the effective time shall be merged with and into Apache Corporation, which shall be the surviving corporation (the "Surviving Corporation"). SECOND: The Restated Certificate of Incorporation of Apache Corporation, as heretofore amended and as in effect on the date of the merger provided for in this Agreement, shall continue in full force and effect as the Restated Certificate of Incorporation of the Surviving Corporation. THIRD: The effect on the capital stock of each of the Constituent Corporations shall be as follows: (a) Each share of capital stock of the Surviving Corporation issued and outstanding on the effective date of the merger shall remain issued and outstanding. (b) Each share of capital stock of the Merged Corporation issued and outstanding on the effective date of the merger shall be cancelled without consideration, and no shares of the capital stock of the Surviving Corporation shall be issued in respect thereof. FOURTH: The bylaws of Apache Corporation as they exist on the effective date of the merger shall be and remain the bylaws of the Surviving Corporation until the same shall be altered, amended or repealed as therein provided. -1- 3 FIFTH: The directors and officers of Apache Corporation on the effective date of the merger shall be the directors and officers of the Surviving Corporation and shall continue in office until the next annual meeting of stockholders and until their successors shall have been elected and qualified. SIXTH: This merger shall become on September 1, 1998. SEVENTH: Upon the merger becoming effective, all the property, rights privileges, franchises, patents, trademarks, licenses, registrations and other assets of every kind and description of the Merged Corporation shall, by operation of law, be transferred to, vested in, and devolve upon, the Surviving Corporation without further act or deed, and all property, rights, and every other interest of the Constituent Corporations shall be as effectively the property of the Surviving Corporation as they were of the Surviving Corporation and the Merged Corporation, respectively. The proper officers and directors of the Surviving Corporation are fully authorized in the name of the Merged Corporation or otherwise to take any and all action, from time to time, to execute and deliver or cause to be executed and delivered all such deeds and instruments and to take or cause to be taken such further or other action as the Surviving Corporation may deem necessary or desirable in order to vest in and confirm to the Surviving Corporation title to and possession of any property of the Merged Corporation acquired or to be acquired by reason of or as a result of the merger herein provided for and otherwise to carry out the intent and purposes hereof. EIGHTH: Anything herein or elsewhere to the contrary notwithstanding, this merger may be amended or terminated and abandoned by the Board of Directors of either of the Constituent Corporations at any time prior to the date of filing this Agreement with the Delaware Secretary of State. IN WITNESS WHEREOF, the parties to this Agreement, pursuant to the approval and authority duly given by resolutions duly adopted by their respective Boards of Directors, have caused these presents to be executed by the president and attested by the corporate secretary of each party hereto as the respective act, deed and agreement of each of said corporations, on this 7th day of August, 1998. ATTEST: APACHE CORPORATION /s/ Cheri L. Peper By: /s/ G. Steven Farris - ----------------------------------- -------------------------------------- Cheri L. Peper G. Steven Farris Corporate Secretary President and Chief Operating Officer ATTEST: MWJR PETROLEUM CORPORATION /s/ Cheri L. Peper By: /s/ G. Steven Farris - ----------------------------------- -------------------------------------- Cheri L. Peper G. Steven Farris Corporate Secretary President -2- 4 I, Cheri L. Peper, Corporate Secretary of Apache Corporation, a corporation organized and existing under the laws of the State of Delaware, hereby certify that the Agreement and Plan of Merger to which this Certificate is attached, after having been first duly signed on behalf of said Apache Corporation and having been signed on behalf of MWJR Petroleum Corporation, a corporation organized and existing under the laws of the State of Delaware, was duly adopted by action of the Board of Directors of said Apache Corporation and without any vote of its stockholders pursuant to Section 251(f) of the General Corporation Law of Delaware and that the conditions specified in the first sentence of such Section 251(f) have been satisfied. WITNESS my hand on this 7th day of August, 1998. /s/ Cheri L. Peper ----------------------------------------- [Seal] Cheri L. Peper Corporate Secretary -3-