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| mother bore (многоствольной скважины Beam) | |||
| motherbore (напр., These well designs were selected mainly for their ability to maximise reservoir contact from a cased motherbore.; скважины Aiduza) | |||
| old hole (главный ствол скважины, от которого отходят боковые стволы при многозабойном бурении) | |||
| основной ствол: 16 phrases in 8 subjects |
| Drilling | 2 |
| Geology | 1 |
| Mining | 4 |
| Oil / petroleum | 4 |
| Oil and gas | 1 |
| Oil and gas technology | 1 |
| Weapons and gunsmithing | 1 |
| Wood processing | 2 |