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

Abstract

Low-permeability reservoir pressure is difficult to maintain, CO2 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 CO2 flooding theory, reservoir engineering optimization design, injection and production engineering and anti-corrosion technology, production CO2 recovery and utilization, and other technical developments and field tests. Happening. Based on the research of CO2 flooding mechanism, this paper takes a well-known oil field H 28 reservoir as the target, and conducts an indoor evaluation of CO2 flooding methods through core physical simulation experiments. The pilot test of CO2 flooding field shows that CO2 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.