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通过模拟试验 ,研究了在不同渗透率的岩石中采油作业入井液固相颗粒对岩石渗透率的损害。结果表明 ,在中、低渗透率和高渗透率的岩石中 ,入井液固相颗粒的直径和含量增加 ,岩石渗透率损害率增加 ;增大入井液的返排压力 ,岩石渗透率损害率减小。
Through the simulation experiment, we studied the damage to the rock permeability caused by the solid particles of well drilling fluid in the oil wells with different permeability. The results show that the diameter and content of solid-phase particles entering into the well increase with the increase of the permeability of the rock, and the increase of the back pressure of the well fluid and the decrease of the rock permeability rate in the rock with medium permeability, low permeability and high permeability small.