| Business | Phone |
| Challenger Minerals Inc 15375 Memorial Dr, Houston 77079 | (281) 925-7200 |
| Crescent Directional Drilling 1300 N Sam Houston Pkwy E, Houston 77032 | (281) 668-9500 |
| F J Brown & Assoc 14505 Torrey Chase Blvd 401, Houston 77014 | (281) 537-7958 |
| Norex Industries Inc 801 Travis St 2100, Houston 77002 | (713) 224-0084 |
| Allstates Directional Drilling 12866 Nimitz St, Houston 77015 | (713) 450-9600 |
| Thunderbay Corp 8554 Katy Fwy, Houston 77024 | (713) 467-7939 |
| Scorpion Offshore 50 Briar Hollow Ln, Houston 77027 | (713) 979-5760 |
| Accuweld 845 Buschong St, Houston 77039 | (281) 227-1985 |
| Hercules Offshore Inc 11 E Greenway Plz 2950, Houston 77046 | (713) 979-9300 |
| Gwdc America 34 S Wynden Dr, Houston 77056 | (713) 622-7400 |
| Simmen Jackson Drilling Inc 1717 Saint James Pl, Houston 77056 | (713) 877-8847 |
| Epoch Well Svc Inc 12707 North Fwy 500, Houston 77060 | (281) 774-5600 |
| Ensco Offshore Co 14800 Saint Marys Ln 230, Houston 77079 | (281) 920-6440 |
| R & B Falcon Corp Purchasing 14701 Saint Marys Ln, Houston 77079 | (281) 754-5000 |
| Trans Ocean Off Shore Oil 1311 Broadfield Blvd, Houston 77084 | (281) 647-8500 |
| Transocean Offshore Deepwater 1311 Broadfield Blvd, Houston 77084 | (832) 587-8500 |
| Weatherford International 515 Post Oak Blvd 600, Houston 77027 | (713) 693-4000 |
| Sharewell Inc Lp 10543 Fisher Rd, Houston 77041 | (713) 983-9818 |
| Transocean Inc 4 E Greenway Plz, Houston 77046 | (713) 232-7500 |
| Patterson-Uti Drilling Co 654 N Sam Houston Pkwy E 330, Houston 77060 | (281) 591-1381 |
| Rotary Steerable Tools 757 Kenrick Dr 124, Houston 77060 | (281) 445-7700 |
| Ryan Directional Technologies 18231 Ammi Trl, Houston 77060 | (281) 443-1414 |
| Strata Directional Technology 1034 Regional Park Dr, Houston 77060 | (713) 934-9600 |
| Rowan Co 8802 Travelair St, Houston 77061 | (713) 649-7777 |
| Rowan Co 9300 Telephone Rd, Houston 77075 | (713) 991-6300 |
| Scan Drilling Co Inc 11777 Katy Fwy 470, Houston 77079 | (281) 496-5571 |
| Rigzone.Com 5870 Highway 6 N 107, Houston 77084 | (281) 345-4040 |