... 平衡性安全阀 balanced safety valve 平衡压力钻井 balance pressure drilling 平衡重 counterweights ...
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balance pressure drilling method 衡压钻井法
balance pressure drilling method over 超衡压钻井法
under balance pressure drilling 欠平衡压力钻井
In the process of balance pressure drilling in fractured carbonate formation, fluid loss is possible when the hole penetrates the fracture.
碳酸盐裂缝性地层，在平衡钻进过程中，一旦钻遇裂缝，就可能发生井漏。
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。
In the original conditions, reservoir rocks and fluids inside the pore space in the pressure equilibrium, once the oil drilling, this balance was destroyed.
在原始条件下，油层岩石与孔隙空间内的流体处于压力平衡状态，一旦钻开油层，这种平衡就被破坏。
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