| Acock/Anaqua Operating Co., |
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| AC Exploration |
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| Acock Engineering & Assoc., I |
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| Acock Operating Limited |
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| Ballard Exploration |
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| Baroid Drilling Fluids |
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| Blackbrush Oil & Gas |
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| BP America Prod. Co. |
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| BP Exploration Operating Com |
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| Brammer Engineering, Inc. |
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| Cabot Oil & Gas |
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| Chaparral Energy |
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| City of Portland |
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| Century Royalty 2000 GP, LLC |
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| Cummins & Walker |
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| Dan A. Hughes |
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| Derwen Resources |
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| Dominion Exploration & Produ |
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| Drill Partners L.P. |
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| East Cameron Partners L.P. |
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| Edge Petroleum Operating Co. |
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| El Paso Production Company |
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| H.P. Ellsworth O & G Propertie |
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| El Paso Production |
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| Encana Oil & Gas (USA), Inc. |
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| Energy Quest Resources |
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| EOG Resources, Inc. |
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| Erskine Energy LLC |
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| First Rock Well Service |
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| Geiser Operating Inc. |
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| GulfTex Energy, LLC |
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| Hankey Oil Company |
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| Hurd Enterprises, LTD. |
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| Kaler Energy Corp. |
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| Lamar Oil & Gas, Inc. |
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| Magnum Producing, L.P. |
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| Neumin Production Company |
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| Newfield Exploration Co. |
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| Noble Energy |
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| Opal Energy, Inc. |
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| Coronado Energy Production, |
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| Petrohawk Energy |
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| Phoenix Exploration Company |
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| Pioneer Drilling Company |
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| Pioneer Natural Resources |
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| Pringle Resources Inc. |
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| Prolithic Energy |
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| Reliance Energy Inc. |
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| Rutherford Oil |
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| Sanchez Oil & Gas |
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| Southern Bay Operating Comp |
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| Scott, Douglas, McOnninco, L. |
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| Shell Exploration & Production |
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| Slawson Exploration Company, |
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| Stephens Production Co. |
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| Stroud Production LLC |
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| Suemaur Exploration & Produc |
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| Synergy Oil & Gas, LP |
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| Tempest Energy Resources |
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| United Resources, L.P. |
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| Ventex Operating Corp. |
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| Voyager Gas Corporation |
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| VTEX Energy, Inc. |
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| XTO Energy Inc. |
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