... 零值超平衡 zero overbalance 超平衡钻井 overbalanced drilling 超谐振平衡(试验)机 resonance balancing machine ...
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In routine overbalanced drilling, the bottom hole pressure towers above the formation pressure so that the mud fluid will leak into the formation.
常规过平衡钻井方式打开油气层时,井底压力高于地层压力,钻井流体会向地层渗滤甚至漏失。
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