Carbon Dioxide Flooding Technology for Ultra-Low Permeability Reservoirs to Greatly Enhance oil Recovery

Low-permeability reservoir pressure is difficult to maintain, CO 2 miscible flooding is difficult to achieve for low-permeability reservoirs, and near-miscible flooding is a promising technology for enhancing oil recovery for low-permeability reservoirs. Aiming at the complex geological and development characteristics of China's continental low-permeability reservoirs, the system elaborated Sinopec's CO 2 flooding theory, reservoir engineering optimization design, injection and production engineering and anti-corrosion technology, production CO 2 recovery and utilization, and other technical developments and field tests. Happening. Based on the research of CO 2 flooding mechanism, this paper takes a well-known oil field H 28 reservoir as the target, and conducts an indoor evaluation of CO 2 flooding methods through core physical simulation experiments. The pilot test of CO 2 flooding field shows that CO 2 flooding can significantly increase the productivity of ultra-low permeability oil wells, improve the development effect of oil wells, and meet the needs of ultra-low permeability reservoir development, and has broad application prospects.