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。
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。
In routine overbalanced drilling, the bottom hole pressure towers above the formation pressure so that the mud fluid will leak into the formation.
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