In order to solve the problems of low strength and poor temperature and salt resistance of common polymer profile control and displacyment agent, AM/AMPS polymer composite hydrogel plugging agent with nano SiO2 particles was developed and its plugging mechanism was analyzed. It was found in the experimental study that AM/AMPS+SiO2 composite hydrogel had high temperature and salt resistance, erosion resistance and plugging performance, and its plugging mechanism was to improve the wettability and change the rock formation from lipophilic to hydrophilic. This composite hydrogel was used in reverse water plugging and oil displacement in oil wells in the Wenliu Oilfield, the oil displacement effect was significantly improved, realizing accumulative oil enhancement of 4 244.0 t, with high economic benefits. This study has a strong guiding significance in solving the problem of low recover efficiency of oil wells with high water cut, and opens a new prospect in application.
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