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| обрушающаяся скважина (требующая цементирования или обсадки) | |||
| неустойчивая скважина | |||
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| ствол скважины с обвалившимися стенками | |||
| caving hole: 2 phrases in 2 subjects |
| Mining | 1 |
| Oil and gas technology | 1 |
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