| 213112 |
Hard banding oil and gas field service on a contract basis |
| 213112 |
Hot oil treating of oil field tanks on a contract basis |
| 213112 |
Hot shot oil field services (on- and off-road) on a contract basis |
| 213112 |
Hydraulic fracturing wells on a contract basis |
| 213112 |
Impounding and storing salt water in connection with petroleum production |
| 213112 |
Installing production equipment at the oil or gas field on a contract basis |
| 213112 |
Lease tank cleaning and repairing on a contract basis |
| 213112 |
Logging wells on a contract basis |
| 213112 |
Mouse hole and rat hole drilling at oil and gas fields on a contract basis |
| 213112 |
Mud service for oil field drilling on a contract basis |