Experimental Study on CO2 Displacement Program

3D and three-phase simulating module of extra-low permeability reservoirs in YSL Oilfield has been established by using PVTi module and E300 module of ECLIPSE. Based on historical matching, Parameters such as gas injection volume, slug size, gas/water ratio, the speed of gas injection and injection rate of sequent water flooding in water alternating gas were considered. The volume of increasing oil and oil-draining rate were taken as evaluation criterion. Then orthogonal test design was preceded according to the principle orthogonal experimental design. Through intuitive and variance analysis with the test results, primary and secondary orders evaluation criterion effected by injection parameters were obtained. The best combination scheme of water alternating gas injection parameters was optimized, which provides theoretical direction and technical support to water alternating gas injection parameters optimization in spot CO2 displacement[1-3].