The engineering geologic and flow characteristic are complex in the low permeability middle and shallow sandstone gas reservoir of Western Sichuan. The research indicates that the water blocking damage of the gas reservoir is serious. The consummate assorted technology have been created aim at the reservoir characteristic in the middle and shallow gas reservoir of Western Sichuan and the demand of flowing-back by long term exploration, have achieved the aim of the lower water blocking damage and the higher flowing-back rate.%川西中浅层致密砂岩气藏具有复杂的工程地质和渗流特征.研究表明,气藏水相圈闭伤害严重.经过长期探索,针对川西中浅层气藏的储层特征和水力压裂返排要求,形成了一套较为完善的配套工艺,实现了降低水相圈闭伤害、提高液体返排率的目标.
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