Study on Displacing Degree of Microscopic Remaining Oil by Different Oil Displacement Agents After Polymer Flooding
(0) The remaining oil distribution after polymer flooding becomes highly scattered,but the remai-ning oil reserves potential is large.So it is urgent to solve the problem of how to master the rules of mi-croscopic remaining oil distribution and how does different oil displacement agent act on the microscopic remaining oil after polymer flooding.According to the data of laser confocal scanning analysis in pressure-coring wells after polymer flooding in Daqing oilfield,this paper deepens the understanding of quantitative distribution of the microscopic remaining oil in the strong watered-out layer after polymer flooding.Based on the previous statistic data of remaining oil saturation in different watered-out layers,the model of strong watered-out natural core is established.Combine modern physical modeling with laser confocal scanning techniques and other methods,some indoor experiments are carried out to study how different oil displacement agent displace different types of microscopic remaining oil in the strong watered-out layer after polymer flooding.The results show that the remaining oil of bound state in strong watered-out lay-ers are similar to that of free state after polymer flooding,which mainly divided into four types with the shape of film-like on the pore surface,adsorption,cluster and inter-granular adsorption.The percentage of remaining oil of free state in middle watered-out layers is 3.7%higher than that of strong watered-out layers.The incremental oil recovery in strong watered-out cores by weak base ASP flooding is 13.3%af-ter polymer flooding,which is 4.7%higher than that of high concentration polymer flooding.The displa-cing ability of weak base ASP flooding on bound state remaining oil is better than that of high concentra-tion polymer flooding.The bound state remaining oil reduced by weak base ASP flooding is 7.1%higher than that of by high concentration polymer flooding.Among them,the remaining oil of film-like on the pore surface is reduced greatly.
Displacing agent strong watered-out layer microscopic residual oil weak base ASP after pol-ymer flooding
Haibo Liu Peihui Han Shuling Gao Ruibo Cao Wenlin Chen Wei Yan Hongwei Wang
Exploration and Development Research Institute of Daqing Oilfield Co.Ltd.,Daqing,Heilongjiang,163712,China
国内会议
青岛
英文
45-51
2018-06-20（万方平台首次上网日期，不代表论文的发表时间）