 |
| well hole: 53 phrases in 16 subjects |
| Drilling | 2 |
| Facilities | 2 |
| Geology | 2 |
| Hydraulic engineering | 1 |
| Makarov | 1 |
| Military | 3 |
| Mining | 1 |
| Oil / petroleum | 10 |
| Oil and gas | 20 |
| Oil and gas technology | 1 |
| Oilfields | 2 |
| Physics | 1 |
| Sakhalin | 2 |
| Technology | 2 |
| Water resources | 2 |
| Weapons and gunsmithing | 1 |