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川中油气层由于采用衰竭式开采方法 ,大部分油井目前的地层压力不足原始地层压力的一半 ,导致地层微裂缝系统的闭合 ,造成油层平均渗透率下降。另外 ,微裂缝系统促使压裂液滤失 ,造成砂堵 ,地层嵌入度大 ,填砂裂缝宽度不足 ,都极大影响压裂效果。建议采取前置液中加入暂堵剂屏蔽 ,压裂液中加入发泡助排剂 ,研究新型的破胶剂和压裂材料等 4条措施。
Due to the depletion method, most of the oil and gas wells currently have less than half the pressure of the original formation, leading to the closure of the formation microfracture system, resulting in a decrease in the average permeability of the reservoir. In addition, the micro-fracture system causes the fracturing fluid to filter out, resulting in sand blockage, large formation embedding degree and insufficient width of sand filling cracks, which greatly affect the fracturing effect. It is recommended to add temporary blocking agent in the pre-fluid shielding, fracturing fluid foam blowing aid, to study the new breakers and fracturing materials, four measures.