... 平衡线膨胀率equalibrium linear expansion value 平衡压力钻井balanced drilling 评价evaluation ...
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... 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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压力平衡式钻井震击器 pressure balanced drilling bumper sub
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分析了岩溶地层水文水井施工中，泡沫实现平衡压力或欠平衡压力钻井的原理及影响泡沫钻井有效井眼压力的因素。
The principle of reaching balance drilling and under balanced drilling using foam mud in water well drilling in Karst formation was presented.
利用气体型流体进行欠平衡钻井，或钻易漏地层时，流体密度及井下液柱压力的确定十分重要。
When underbalanced drilling or drilling easy leaky zone by using aeration fluid, the determination of fluid density and downhole fluid column pressure is very important.
井底负压值控制是欠平衡钻井技术的基础，而井底负压值的大小与环空多相流的有关压力计算有关。
The under-balanced drilling technology is based on how to control the bottom negative pressure which is related to the pressure computation of multiphase flow in annulus .
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