| AIOC |
| Alliance |
| Amoco |
| Anadarko |
| ANR Pipeline |
| ARCO |
| Arethusa Off-Shore |
| BP |
| British Gas |
| Brown & Root |
| Carigali |
| Chevron |
| CNOOC |
| CNG |
| Conoco |
| Cliffs |
| Daewoo Heavy Industries |
| Dolphin Drilling |
| Dominion Oil |
| El Paso Production |
| Enron |
| Esso Production Malaysia |
| ExxonMobil |
| Falcon |
| Hyundai Heavy Industries |
| Marathon |
| Maxus |
|
| McDermott |
| Modec |
| Mora |
| Murphy Oil |
| Noble Drilling |
| ONGC of India |
| Oryx Energy |
| Pemex |
| Pennzoil |
| Perforadora Mexico |
| PetroBras |
| Phillips Petroleum |
| Reading & Bates Drilling |
| Rowan |
| Pool |
| Pogo |
| Rigmar AS |
| Rowan Companies |
| Samedan |
| Saudi Aramco |
| Shell |
| Sonat Offshore |
| Sumitomo Heavy Industries |
| Texaco |
| Unocal |
| Vastar |
| Western Oceanic |
|
