UK
- Amerada Hess
- Apache North Sea
- BG Group
- BP
- Britannia Operator
- Centrica
- Chevron Texaco
- CNR International UK Ltd
- ConocoPhillips (Burlington Resources)
- Dana Petroleum
- EOG Resources
- E.ON Ruhrgas UK North Sea Ltd
- Fairfield Energy
- GDF Suez
- Global Santa Fe
- Hurricane Exploration
- Hydrocarbon Resources Limited
- Marathon Oil
- Maersk Oil North Sea UK Ltd
- Nexen Petroleum
- OMV UK
- Phillips
- Premier Oil
- RWE Dea
- Shell
- Sterling Resources
- Suncor
- Talisman Energy
- Total
- Venture Production
- Viking UK
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International
- BG Group (Norway and India)
- Bowleven (Gabon)
- Burlington Resources (Algeria, Egypt and Holland)
- Carigali Hess (Malaysia)
- Canadian Superior (Trinidad)
- Chevron Texaco (Brazil)
- CH4 Nederland B.V.
- CNR International (Ivory Coast)
- DONG (Denmark and Norway)
- Denerco & Altinex (Denmark)
- Dubai Petroleum
- East Coast Energy (Tanzania)
- Ecumed Petroleum (Tunisia)
- First Africa Oil (Gabon)
- GSPC (India)
- Gulf Key Stone Petroleum
- Hoang Long (Vietnam)
- Kavala Oil (Greece)
- KOC (Kuwait)
- Lundin Russia Services B.V.
- Maersk Oil (Denmark)
- Maghreb Petroleum
- Midia Resources (Romania)
- MPE (Morocco)
- OMV (Australia)
- ONGC-VL (Iran)
- PetroResurs (Russia)
- Petro-Canada (Algeria, Tunisia and Trinidad)
- Petroceltic
- Phillips (Denmark)
- Premier Oil (Vietnam and India)
- Regal Petroleum (Ukraine and Romania)
- Repsol (Libya)
- Talisman Energy (Norway)
- Salamander (Indonesia and Thailand)
- Sonangol
- Statoil ASA (Norway)
- Sterling Resources (Romania)
- TAQA (Holland)
- Total (Algeria, Congo, Libya, Russia and Nigeria)
- Vitol
- Wintershall Noordzee B.V.
- Woodside
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