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在室内条件下,通过岩心驱替实验对CO2驱提高低渗透油藏的采收率进行了研究,对比分析了CO2、N2、压缩空气等不同驱介质的驱油效率;在国内外文献调研的基础上系统阐述了注CO2增油机理;通过数值模拟对CO2气驱、N2、压缩空气、水等不同驱替介质的采收率进行了对比,并对部分参数进行了优化.研究结果表明,在低渗透油藏中CO2气体增油效果最明显,压缩空气次之,最后为N2驱.通过对CO2参数优化,得到了模拟区块实施CO2驱的最佳渗透率和剩余油饱和度.研究结果对我国油藏注气的开发具有一定的指导意义.
Under the laboratory conditions, the oil recovery efficiency of low permeability reservoirs enhanced by CO2 flooding was studied by core flooding experiments, and the displacement efficiencies of different flooding media such as CO2, N2 and compressed air were compared and analyzed. At home and abroad, Based on the systematic explanation of the CO2 injection mechanism, the numerical simulation was used to compare the recovery rates of different displacement media such as CO2 gas flooding, N2, compressed air and water, and some parameters were optimized.The results show that, In the low permeability reservoir, the effect of CO2 gas addition is the most obvious, compressed air is second, and finally N2 is flooded.Optimized CO2 parameters, the optimal permeability and residual oil saturation of CO2 flooding in simulated area are obtained. The result is of guiding significance for the development of gas injection in our country.