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