CAJ | 학술논문

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.
재실내조건하,통과암심구체실험대CO2구제고저삼투유장적채수솔진행료연구,대비분석료CO2、N2、압축공기등불동구개질적구유효솔;재국내외문헌조연적기출상계통천술료주CO2증유궤리;통과수치모의대CO2기구、N2、압축공기、수등불동구체개질적채수솔진행료대비,병대부분삼수진행료우화.연구결과표명,재저삼투유장중CO2기체증유효과최명현,압축공기차지,최후위N2구.통과대CO2삼수우화,득도료모의구괴실시CO2구적최가삼투솔화잉여유포화도.연구결과대아국유장주기적개발구유일정적지도의의.
CO2 flooding to enhance oil recovery from reservoir was studied by core displacement experiments under laboratory level. A comparative analysis of the oil displacement efficiency with various displacing media was conducted by replacing CO2 with water, compressed air and N2. A numerical simulation method was employed to theoretically analyze the efficiency of reservoir recovery with different displacing media (CO2, compressed air and N2), along with to optimize parameters utilized in the experiment. Both experimental and theoretical results show that CO2 flooding has the best oil recovery efficiency, followed by compressed air and N2. The numerical simulation also provided the permeability and remaining oil saturation of CO2 flooding in the real block. The present study demonstrates the potential applicability of gas flooding to enhance oil recovery from the low-permeable reservoirs..