It results in the closure of microfracture system and makes oil reservoir permeability decrease.In addition,microfracture system brings fracturing fluid filtrateloss,and forms sand plug.

• 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。