| 213112 |
Drilling shot holes at oil and gas fields on a contract basis |
| 213112 |
Drilling site preparation at oil and gas fields on a contract basis |
| 213112 |
Drill-stem testing in oil, gas, dry, and service well drilling on a contract basis |
| 213112 |
Excavating mud pits, slush pits, and cellars at oil and gas fields on a contract basis |
| 213112 |
Exploration services for oil and gas (except geophysical surveying and mapping) on a contract basis |
| 213112 |
Fishing for tools at oil and gas fields on a contract basis |
| 213112 |
Gas well rig building, repairing, and dismantling on a contract basis |
| 213112 |
Gas, compressing natural, in the field on a contract basis |
| 213112 |
Geological exploration (except surveying) for oil and gas on a contract basis |
| 213112 |
Geophysical exploration (except surveying) for oil and gas on a contract basis |