Abraxas Production Corporation
San Antonio, Texas
AEC International
Houston, Texas
AGIP Petroleum
Houston, Texas
Amoco Production Company
Houston, Texas
Anadarko Petroleum Corporation
Houston, Texas
Apache Corporation
Houston, Texas
Aviara Energy Corporation
Houston, Texas
Bass Enterprises Production Co.
Metairie, Louisiana
Bayou City Exploration, Inc.
Houston, Texas
Bexco Oil & Gas
Bryan, Texas
BHP Petroleum (Americas) Inc.
Houston, Texas
Wyoming
Big E Drilling Company
Bellaire, Texas and Mexico
Bishop Petroleum, Inc.
Houston, Texas
Bois d’Arc Offshore LLC
Houston, Texas
BP America Production Co.
Houston, Texas
Burlington Resources
Midland, Texas
Cabot Oil & Gas Corporation
Houston, Texas
Chevron USA Production Co.
Houston, Texas
Cimarex Energy Co.
Tulsa, Oklahoma
Cliffs Drilling Company
Houston, Texas
Comstock Resources
Frisco, Texas
IP Petroleum, Inc.
Houston, Texas
Japex (U.S.) Corporation
Houston, Texas
Katy Storage & Transportation
LP
Katy, Texas
King Ranch Oil and Gas Co.
Houston, Texas
Louis Dreyfus Natural Gas
Houston, Texas
Matador Production Co.
Dallas, Texas
Mitchell Energy Corporation
The Woodlands, Texas
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Noble Energy, Inc.
Houston,Texas
North Central International
Inc.
Houston, Texas and Thailand
North Central Oil Corporation
Houston, Texas
Northstar Interests
Northstar Gulfsands LLC
Houston, Texas
Ocean Energy, Inc.
Houston, Texas
Oryx Energy Company
Dallas, Texas
Pennzoil Exploration & Production,
Inc.
Houston, Texas, and Russia
Peoples Energy Production Co.
Houston, Texas
Petrohawk Operating Co.
Houston, Texas
Phillips Petroleum Company
Bellaire, Texas
Presidio Oil Company
Englewood, Colorado
Range Production Company
Houston, Texas
Resolve Drilling Company
Houston, Texas
Fort Worth, Texas
Corpus Christi Drilling Co.
Corpus Christi, Texas
CW Resources, Inc.
Longview, Texas
Devon Energy Corporation
Houston, Texas
Bridgeport, Texas
Dominion Exploration & Production
Houston, Texas
El Paso Production Company
Houston, Texas
Elysium Energy L.L.C.
Houston, Texas
Encana Oil and Gas
Dallas, Texas
Encore Operating L.P.
Fort Worth, Texas
Eni Petroleum Co. Inc.
Offshore, Gulf of Mexico
Enron Oil & Gas Co. U.S. & Intl.
Houston, Texas
Venezuela, China, France
Entre Energy Corporation
Houston, Texas
EOG Resources, Inc.
Houston, Texas
Trinidad, China
ETOCO, L.P.
Houston, Texas
EXCO Resources, Inc.
Dallas, Texas
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ExxonMobil Global Services Co.
Houston, TX
Forest Oil Corporation
Denver, Colorado
Fremont Energy, Inc. (Bechtel)
Houston, Texas
Goldrus Producing Company
Houston, Texas
Holly Petroleum, Inc.
Houston, Texas
Hunt Petroleum Corporation
Houston, Texas
Samedan Oil Corporation
Houston, Texas
Samson Lone Star L. P.
Samson Resources Co.
Tulsa, Oklahoma
Santa Fe International
Houston, Texas
Jakarta, Indonesia, Bolivia
Seneca Resources Corporation
Houston, Texas
Sonat Exploration Company
Arcadia, Louisiana
Southwestern Energy Production Co.
Houston, Texas / Conway, Arkansas
Swift Energy Company
Houston, Texas
Tana Exploration Co. LLC
Houston, Texas
TDC Energy
The Woodlands, Texas
Tejas Gas Corporation
Houston, Texas
Texaco U.S.A.
New Orleans, Louisiana
The Houston Exploration Company
Houston, Texas
Torch Operating Company
Houston, Texas
Total Minatome Corporation
Houston, Texas
Union Pacific Resources Company
Fort Worth, Texas
Vastar Resources, Inc.
Houston, Texas
Walter Oil & Gas
Corporation
Houston, Texas
Wellstream Company L.P.
Panama City, Florida
Wiser Oil Company
Dallas, Texas
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