- AGIP
- Amerada Hess
- Anadarko Petroleum Corporation
- BHP Billiton
- BP
- Chevron
- ConocoPhillips
- Deepstar JIP
- Department of Energy (US)
- AGIP KCO
- RasGas
- KMC Oil Tools
- Gaither Petroleum
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- ExxonMobil
- Gas Research Institute
- Husky Oil
- Kerr-McGee
- Kuwait Oil Company
- Murphy Oil
- Shell Oil
- Tombim
- TOTAL
- PDVSA
- Petrobras
- Statoil
- ENI
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