under balance pressure drilling
under balance pressure drilling
平衡压钻井
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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Using under balance pressure drilling technique aims at preventing the mud loss and pollution of Palaeozoic limestone reservoir in this area and therefore protecting oil reservoir.
该井四开钻探过程中成功地采用欠平衡钻井技术钻穿寒武系凤阳山组，以防止该区古生界灰岩储层发生井漏及储层污染，从而保护油层。
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