Abstract

AbstractCO2 can interact with crude oil through physical and chemical processes to enhance oil recovery (CO2-EOR), which caused the CO2-EOR technology become the one of the most important tertiary recovery techniques. At the same time, CO2 is an acid gas and the injected CO2 can induce a serious of geochemical reactions changing the geochemical equilibrium of reservoir and also affects the interaction between CO2 and crude oil. Therefore, definite the fate of CO2 by both considering the chemical and flow conditions is necessary to quantitatively evaluate the oil recovery efficiency and the sequestration efficiency of the CO2-EOR technology. In this study, using numerical simulation method based on the data of Jilin oilfield which considered as the prototypical CO2 flooding project in China, compared the development efficiency of CO2-EOR technology whether or not considering the CO2-water-rock interaction, specified the volume of CO2 in different phases under the alternate water and gas injection. The sequestration efficiency of CO2 and recovery efficiency were both considered to optimize the engineering parameter of CO2-water ratio in the numerical model. The results indicated that the consideration of CO2-water-rock interaction will cause the better oil recovery efficiency and the influence is increase with time. When there is equal volume of CO2 injection, the influences of the CO2-water ratio in recovery efficiency and sequestration efficiency are not consistent. Comprehensively considering the CO2 geological sequestration efficiency and oil recovery efficiency, the CO2-water ratio of 1:1 is the optimal scheme.KeywordsCO2-EORThe fate of CO2Sequestration efficiencyOil recoveryCO2-water ratio

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