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针对户部寨地区Es23—Es4 3 段地层特点 ,分析了压裂过程中的地层损害机理。由于该地区粘土矿物含量高、毛细管半径小、地层物性差 ,使用常规压裂液施工时 ,会造成粘土膨胀、微粒运移、水锁与贾敏效应、粘滞性流体滞留及固体颗粒堵塞等多种地层损害。在室内研究的基础上 ,提出了降低成胶剂水不溶物含量、控制液体滤失、提高液体表面活性、强化破胶、稳定地层粘土等地层综合保护措施。
According to the characteristics of Es23-Es4 section 3 in Hubuzhai area, the formation damage mechanism in fracturing process is analyzed. Due to high clay mineral content, small capillary radius and poor formation properties in the area, clay swelling, particle migration, water lock-and-Jamming effect, viscous fluid retention and solid particle blockage, etc., can occur when using conventional fracturing fluid A variety of formation damage. Based on the study in the laboratory, some measures to reduce the content of water insoluble matter in the gelatinizer, control the fluid loss, improve the liquid surface activity, strengthen the gel breaking and stabilize the formation clay are put forward.