针对普通聚合物调驱剂强度低、耐温耐盐性差等问题,研制了添加纳米SiO2颗粒的AM/AMPS聚合物复合凝胶堵水剂,并分析其堵水机理。实验研究表明:AM/AMPS+SiO2复合凝胶具有良好的耐温耐盐性、耐冲刷性及封堵性能,其堵水机理为改善润湿性,将岩层由亲油变为亲水。使用该复合凝胶对文留油田的油井实施反向堵水驱油作业,驱油效果明显改善,累计增油量为4 244.0 t,取得了良好的经济效益。该研究对解决采收率低的高含水油井具有指导意义和应用推广价值。
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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