- Andina, S.A. (Boliva)
- Aramco (Saudi Arabia)
- Baker-Atlas (formerly SSI) (USA)
- BP America (USA)
- Breitburn Energy Corp. (USA)
- Bureau of Land Management (USA)
- CMS Gas Transmission (Argentina/USA)
- Computer Modeling Group (Canada)
- ConocoPhillips (Qatar)
- Elk Petroleum (USA)
- EnCana (USA)
- E.ON (USA)
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- Enstor Operating Co. (USA)
- Geostock (France)
- Grynberg Petroleum (USA)
- Gujarat State Petroleum (India)
- Kinder Morgan Inc (USA)
- Laclede Gas (USA)
- Maxus Energy SE Sumatra (Indonesia)
- Noble Energy (USA)
- Occidental of Elk Hills (USA)
- PDVSA (Venezuela)
- Pemex (Mexico)
- PetroProduccion (Ecuador)
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- Plains Petroleum (USA)
- Puget Sound Energy (USA)
- Qatar Petroleum (Qatar)
- Rancher Energy (USA)
- RasGas Co. Ltd. (Qatar)
- Reliance Industries (India)
- Repsol-YPF (Argentina)
- Schlumberger (China, Egypt, Canada)
- Texas Gas Transmission (USA)
- Venoco (USA)
- Xcel Energy (USA)
- YPF (Argentina)
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