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| drilling mud upward velocity | |||
| annular return velocity; annular velocity | |||
| скорость восходящего потока бурового раствора: 10 phrases in 5 subjects |
| Drilling | 1 |
| General | 1 |
| Oil / petroleum | 4 |
| Oil and gas | 2 |
| Oilfields | 2 |
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