Improving Recovery Studies By CO₂ Of Pucheng Sha-yixia Oil Deposit

At present, in view of the world most oilfields which used waterflooding need further improving recovery and water shortage problem, foreign companies in recent years vigorously use the development and application of improving recovery (EOR) technology with carbon dioxide. This technology can not only meet the needs of oilfield development, but can also solve the problems of storage of the carbon dioxide and protect atmospheric environment. This technology is not only suitable to the conventional reservoir, especially for low permeability, extra-low permeability reservoirs, can also significantly enhance oil recovery.Currently, the difficulty of development with injecting water conventionally continuously increased, with the application of CO₂ gas driving technology the difficulty of water injection and to improve oil recovery can effectively be solved. Based on laboratory experiments, the application of numerical simulation technology optimized gas injection mode and the gas injection timing; Analyzing the influence of enhancing oil recovery of reservoir geological parameters to the CO₂ gas injection. Research shows that: the hydrosphere alternating injection way is more optimal; The stronger the heterogeneity, the worse development effect is; The bigger the reservoir permeability, the higher the oil saturation and the lower the oil viscosity, the better the results of CO₂ gas injection is.Based On the above studies, we chose wells for test and designed implementation plan.