 |
| |||
| tubing head (Alexander Demidov) | |||
| casing connections (felog) | |||
casing head (Casing heads are of two types according to its hanged casing types: screw casing head and slip casing head.  com.cn Alexander Demidov) | |||
| |||
| pier (печи) | |||
| колонная обвязка: 3 phrases in 1 subject |
| Oil and gas technology | 3 |