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研究了水驱、CO2驱、水和CO2混合驱替方式下稠油油藏注入井的吸水指数.根据West Sak稠油油藏数据建立了三相、三维黑油模型,并进行了数值模拟研究.通过数值模拟研究可以得出以下结论:稠油油藏注入井的吸水指数随注入速度的增加而减小;与水驱相比,CO2驱可以有效的提高稠油油舱的吸水指数;然而水和CO2混合驱替显示CO2段塞注入之后进行水驱注入井的吸水指数迅速下降,但水和CO2混合驱替较单纯水驱吸水指数明显提高,CO2注入量越大吸水指数改善越大.
The water absorption index of injection wells of heavy oil reservoirs under water flooding, CO2 flooding, water and CO2 flooding was studied.According to the data of West Sak heavy oil reservoir, three-phase and three-dimensional black oil models were established and studied by numerical simulation The following conclusions can be drawn from the numerical simulation: The water absorption index of injection wells in heavy oil reservoirs decreases with the increase of injection rate; compared with water flooding, CO2 flooding can effectively increase the water absorption index of heavy oil tank; however, The mixed displacement of water and CO2 shows that the water absorption index of waterflooding injection wells decreases rapidly after CO2 slug injection. However, the water flooding and water flooding index of water flooding and CO2 flooding increase obviously, and the bigger CO2 injection quantity is, the greater the water flooding index is.