| Business | Phone |
| Blue Ridge Exploration Inc 10777 Westheimer Rd 170, Houston 77042 | (832) 358-3900 |
| Todco 2000 W Sam Houston Pkwy S, Houston 77042 | (713) 278-6000 |
| Alert Disaster Control 1900 West Loop S, Houston 77027 | (713) 964-4084 |
| Applied Drilling Tech Inc 15375 Memorial Dr, Houston 77079 | (281) 925-7100 |
| Big 6 Drilling Co 7500 San Felipe St 250, Houston 77063 | (713) 783-2300 |
| Delmar Systems Inc 12000 Richmond Ave, Houston 77082 | (281) 752-9005 |
| Diamond Offshore Drilling Inc 15415 Katy Fwy 100, Houston 77094 | (281) 492-5300 |
| Dixilyn-Field Drilling Co 5005 Riverway Dr, Houston 77056 | (713) 877-8850 |
| Energy Service Co Inc-Ensco 1201 Dairy Ashford St, Houston 77079 | (281) 496-6060 |
| Epoch Well Svc Inc 8400 Breen Rd, Houston 77064 | (713) 849-2271 |
| Global Santa Fe Corp 15375 Memorial Dr, Houston 77079 | (281) 925-6000 |
| Mears Group Inc 521 N Sam Houston Pkwy E, Houston 77060 | (281) 820-0940 |
| Helmerich & Payne Inc 13609 Industrial Rd, Houston 77015 | (713) 451-0402 |
| Helmerich & Payne Intl Drllng 16365 Park Ten Pl 300, Houston 77084 | (281) 398-5457 |
| Horizonal Technology 12029 Brittmoore Park Dr, Houston 77041 | (713) 466-3091 |
| Iri Intl 1000 Louisiana St, Houston 77002 | (713) 651-8002 |
| Jesuit Volunteer Corps South 1919 La Branch St 409, Houston 77002 | (713) 739-0750 |
| J Tech Intl 6060 Romona Blvd, Houston 77086 | (281) 847-9200 |
| Nabors Industries Inc 515 W Greens Rd 1200, Houston 77067 | (281) 874-0035 |
| Nicklos Drilling Co 3355 W Alabama St, Houston 77098 | (713) 224-5959 |