同时这两各方面相互作用致使地层有效渗透率降低。
Meanwhile, the two aspects interact with each other, which make the effective permeability decreases.
井底附近地层渗透率降低比改善对调查半径的影响要大。
If skin factor of formation damage is more, its radius of investigation is less.
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.
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