over-balanced pressure
... 过渡金属transitional metal 过平衡压力over-balanced pressure 过剩浓度residual concentration ...
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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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