 |
| horizontal wells: 24 phrases in 11 subjects |
| Construction | 4 |
| Drilling | 1 |
| General | 1 |
| Geology | 1 |
| Geophysics | 4 |
| Intelligence and security services | 1 |
| Natural resourses and wildlife conservation | 1 |
| Oil / petroleum | 4 |
| Oil and gas | 1 |
| Oil and gas technology | 3 |
| Sakhalin | 3 |