关键词: 聚合物驱, 剩余油, 分布规律, 实验, 研究

Abstract: Polymer－flooding is an effective way to enhance oil recover,polyacrylamide is frequently used for polymer－flooding in Daqing oilfield.Enhancing oil recovery in polymer flooding mainly depends on increasing the viscosity of injected water and improving the mobility ratio of driving liquid to displaced liquid with the sweep volume enlarged.After polymer flooding,recovery ratio is raised 10%,but 50% of geological reserves still remains in original reservoirs.which needs to be produced by other methods for EOR.In this paper,NMR imaging techniques,modern physics and numerical simulation methods have been used to study the distribution of remaining oil in the heterogeneous physical model with geological characteristics of reservoirs of Daqing oilfield after polymer flooding.The results show that remaining oil after polymer flooding mainly distributes in middle－low permeable layers along longitudinal direction and in the areas far from main stream line on the plane level for rhythmic pay.These conclusions will provide experimental basis for choosing other methods to increase oil recovery after polymer flooding.

Key words: polymer flooding, remaining oil, distribution regularities, experiment study