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Supplement and optimization of classical capillary number experimental curve for enhanced oil recovery by combination flooding

查看全文 作　　者：QI [1]LianQing;LIU [2]ZongZhao;YANG [3]ChengZhi;YIN [1]YanJun;HOU [4]JiRui;ZHANG [5]Jian;HUANG [1]Bo;SHI [1]FengGang 高影响力作者 机构地区：[1]CNOOC EnerTech-Drilling & Production Co.;[2]China United Coalbed Methane Corporation, Ltd.;[3]CNPC Research Institute of Exploration and Development;[4]Enhanced Oil Recovery Institute of China University of Petroleum;[5]CNOOC Research Institute高影响力机构 出　　处：《Science China(Technological Sciences)》索引2014年第57卷第11期,共14页高影响力期刊 摘　　要：In the middle of the last century,American scientists put forward the concept of capillary number and obtained the relation curve between capillary number and residual oil through experiments.They revealed that the corresponding residual oil saturation decreased with increasing of capillary number;after capillary number reached up to a limit,residual oil saturation would become stable and did not decrease.These important achievements laid a theoretical base for enhanced oil recovery with chemical flooding.On the basis of the theory,scholars developed chemical flooding numerical simulation software UTCHEM.During the numerical simulation study of combination flooding,the authors found that as the capillary number is higher than the limit capillary number,the changes of the residual oil saturation along with the capillary number differ from the classical capillary number curve.Oil displacement experiments prove that there are defects in classic capillary number experimental curve and it is necessary to mend and improve.Capillary number‘calculation’curve is obtained with a method of numerical simulation calculation and a complete description of capillary number curve is provided;On this basis,combination flooding capillary number experimental curve QL is obtained through experiments,which is different from the classical capillary curve;and based on which,an expression of corresponding combination flooding relative permeability curve QL is given and the corresponding relative permeability parameters are determined with experiments.Further oil displacement experiment research recognizes the cause of the singular changes of the capillary number curve.'Combination flooding capillary number experimental curve QL'and'combination flooding relative permeability curve QL'are written in combination flooding software IMCFS,providing an effective technical support for the application of combination flooding technical research. 关 键 词：实验曲线 原油采收率 复合驱 毛细血管 相对渗透率曲线 数值模拟软件 剩余油饱和度 残余油饱和度
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