| Phillips Petroleum Co. | Exxon Co. |
| Mobil Exploration and Producing | Agip Petroleum Co. |
| Unocal Corporation | Astra Quiamare, S.A. |
| Ampolex (USA), Inc. | Mobil U.K. Ltd. |
| Japan National Oil Corporation | BHP Zilkha Energy |
| Tecpetrol de Venezuela | British Borneo |
| Wascana | Continental Emsco |
| Reading & Bates Drilling Co. | Global Marine Drilling Co. |
| Noble Drilling Co. | Conoco |
| Pennzoil | Halliburton Energy Services |
| Japex | Chevron |
| Occidental Petroleum | Amoco |
| British Gas | American Exploration |
| Highland Oil | Forcenergy |
| Anadarko Petroleum | Spirit Energy 76 |
| Cannmar | Kerr-McGee Oil & Gas Corp. |
| Marathon Oil Company | Murphy Exploration |
| Petrobras | Cliff's Turnkey |
| Pluspetrol | Southwestern Energy |
| Pride Drilling Co. | Arco |
| Atwood | 2MK |
| Petrex | Saipem |
| Rodriguez, Pruneda, Tovar & Calvillo Attys. | Brown & Connery LLP |
| Gardere, Wynne, Sewell & Riggs, L.L.P. | Lemle & Kelleher Law Offices |
| O'Neill & Balegaa, P.C. | Larzelere Picou & Wells |
| Charles Hammaker Atty | Hickley and Mackey |
| Strausberger and Price | Brown & Connery LLP |
| U.S. Gulf Coast | U.S. Domestic Land | U.S. West Coast |
| Canada | Venezuela | Brazil |
| Argentina | Nigeria | Gabon |
| Ivory Coast | Congo | Zaire |
| Angola | South Africa | Cameroon |
| Equatorial Guinea | Ghana | Spain |
| Italy | Malta | Tunisia |
| Egypt | Algeria | England |
| Norway | Holland | Pakistan |
| China (PRC) | Singapore | Indonesia |
| Papua New Guinea | Australia | Brunei |
| Malaysia | Thailand | Hong Kong |
| Russia | Kazakhstan | Scotland |
| Japan | Korea | Greece |
| Azerbaijan | Sicily | Ethiopia |
| India | Timor | Philippines |
| Sabah | Sarawak | Sumatra |
| Uzbekistan | Turkmenistan | Balikpapan |
| Peru | Colombia | Ecuador |
| Algeria | United Arab Emirates | Mexico |
| New Zealand | Greece | Eritera |