The damage mechanism is that the reservoir po re passages were plugged by the salt crystals formed from the high salinity bri ne drilling completion fluid in the process of back flowing displacement with dry gas.

• 分析研究其损害机理 ,主要原因是在干气返排驱替过程中 ,高矿化度盐水钻井完井液滤液中的盐组分会形成盐结晶堵塞储层孔道。