Residual oil distribution characteristics after polymer flooding in north blockⅠ5 andⅡ1-3 of Shuanghe oilfield

By applying fine reservoir numerical simulation and sealed coring methods,in combination with reservoir dynamic analysis and dynamic data testing,3D quantitative description on residual oil in vertical,horizontal directions and interlayer of north blockⅠ5 andⅡ1 - 3 of Shuanghe oilfield has been carried out.The results indicate in horizontal direction, the residual reserves is mainly within the area with water cut greater than 90%and in the position of layer margins, of low permeability and imperfect well pattern,its saturation is higher;in vertical direction,the residual oil is relatively more inⅡ3 thanⅠ5 andⅡ2 due to different recovery degree,while in interlayer,the residual oil is mainly distributed at the top of thick reservoir and low permeability section, and the formation testing results of cored well is in agreement with the study results.