| 213111 |
Tailing in oil and gas field wells on a contract basis |
| 213111 |
Water intake well drilling, oil and gas field on a contract basis |
| 213111 |
Well drilling (i.e., oil, gas, water intake wells) on a contract basis |
| 213111 |
Workover of oil and gas wells on a contract basis |
| 213112 |
Acidizing oil and gas field wells on a contract basis |
| 213112 |
Building oil and gas well foundations on a contract basis |
| 213112 |
Building, erecting, repairing, and dismantling oil and gas field rigs and derricks on a contract basis |
| 213112 |
Cementing oil and gas well casings on a contract basis |
| 213112 |
Chemically treating oil and gas wells (e.g., acidizing, bailing, swabbing) on a contract basis |
| 213112 |
Cleaning oil and gas field lease tanks on a contract basis |