| AIOC |
| Alliance |
| Amoco |
| Anadarko |
| ANR Pipeline |
| ARCO |
| Arethusa Off-Shore |
| BP |
| British Gas |
| Brown & Root |
| CACT |
| Carigali |
| Chevron |
| CNOOC |
| CNG |
| CONHW |
| Conoco |
| Conoco Phillips China |
| Cliffs |
| Cuu Long JOC |
| Daewoo Heavy Industries |
| Devon |
| Dolphin Drilling |
| Dominion Oil |
| El Paso Production |
| ENI Petroleum |
| Enbridge |
| Enron |
| Ensearch |
| Escal UGS |
| Esso Australia |
| Esso Production Malaysia |
| ExxonMobil |
| Falcon |
|
| Foxtrot |
| Global Process Systems |
| Gulf Resources |
| Hercules |
| Hess |
| Hyundai Heavy Industries |
| IMC |
| Koch Oil |
| LL&E |
| M3nergy |
| Marathon |
| Maxus |
| McDermott |
| Modec |
| Mora |
| Murphy Oil |
| Nabors-Pool Arabia |
| Noble Drilling |
| Noble Energy |
| Occidental Petroleum |
| Offshore Express |
| Oman Petroleum |
| ONGC of India |
| Origin Energy |
| Oryx Energy |
| Palm Energy |
| Pemex |
| Pennzoil |
| Perforadora Mexico |
| Pertalahan Arnebatara Natuna |
| PetroBras |
| Petronas Carigali |
| Petronas Myanmar |
| Petro-Tech Peruana |
|
| Phillips Petroleum |
| Premier Oil |
| Reading & Bates |
| Reliance Industries |
| Rowan |
| Pool |
| Pogo |
| Rigmar AS |
| Rowan Companies |
| Samedan |
| Santos |
| Sarawak Shell |
| Saudi Aramco |
| Shell |
| Sonangol |
| Sonat Offshore |
| Star Energy |
| Sumitomo Heavy Industries |
| Talisman |
| Texaco |
| Transocean |
| Unocal |
| Vastar |
| Western Oceanic |
|
