 |
| hole bottom: 611 phrases in 25 subjects |
| Audit | 1 |
| Automated equipment | 2 |
| Caspian | 1 |
| Drilling | 50 |
| General | 7 |
| Geology | 5 |
| Geophysics | 3 |
| Makarov | 1 |
| Mathematics | 2 |
| Military | 1 |
| Mining | 14 |
| Occupational health & safety | 1 |
| Oil / petroleum | 89 |
| Oil and gas | 158 |
| Oil and gas technology | 79 |
| Oilfields | 93 |
| Production | 7 |
| Sakhalin | 30 |
| Sakhalin A | 1 |
| Sakhalin R | 7 |
| Silicate industry | 1 |
| Technology | 51 |
| Tengiz | 3 |
| Transport | 1 |
| Well control | 3 |