 |
| |||
| soil pipe; anchor string; surface pipe | |||
| conductor pipe; external casing | |||
| surface casing | |||
| surface string | |||
| collar piping; conductor casing | |||
| 表层套管: 11 phrases in 4 subjects |
| Drilling | 4 |
| Earth sciences | 2 |
| Oil / petroleum | 1 |
| Technology | 4 |
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