钻井后因应力集中产生的压密效应，使地层渗透率降低，影响油井产量。
Formation permeability is decreased and well production is affected due to compaction effect caused by stress concentration after drilling.
试验结果表明：孔隙度和渗透率随压密压强的增大近似呈线性减小；
The result of the tests shows that the porosity and permeability decreases linearly as pressure density and pressure intensity increases.
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