Study on CO2 Flooding Technology of Strong Water Sensitive Reservoir in Complex Fault Block Reservoir

Abstract

AbstractIt is difficult to inject water and to establish effective driving system between injection and production wells in the highly water-sensitive reservoir in the complex fault block reservoir Hailar Basin. CO2 flooding technology can effectively solve the problem of formation energy deficit in the highly water sensitive reservoir. In order to summarize the adaptability of CO2 flooding technology in complex fault block reservoir and accelerate its application Hailar Basin, the article analyzed CO2 flooding mechanism in the highly water sensitive reservoir, evaluated the effectiveness, and summarized the main problems at present stage of CO2 flooding in complex fault block reservoir. In view of the problems of gas channeling in the process of CO2 injection and the large difference between oil well responses in complex fault block reservoir, the technical countermeasures such as periodic gas injection, water/gas alternating injection and fracturing stimulation to promote efficiency were put forward, which effectively solved the problem of gas channeling in gas injection to drive oil well in complex fault block reservoir of Hailar Basin, and provided technical reference for the dissemination and application of CO2 flooding in complex fault block reservoirs.KeywordsComplex fault blockHighly water sensitive reservoirCO2 floodingGas channelingNumerical simulationWater/gas alternating injection