 |
| |||
| surface controlled subsurface safety valve | |||
| subsurface safety system | |||
| downhole safety valve; subsurface safety valve | |||
| скважинный предохранительный клапан: 9 phrases in 6 subjects |
| Oil / petroleum | 1 |
| Oil and gas | 2 |
| Oil and gas technology | 2 |
| Oilfields | 1 |
| Sakhalin A | 1 |
| Tengiz | 2 |