关键词: 聚合物驱, 〓数值模拟, 〓盐水模型, 〓新方法, 〓复杂油藏

Abstract: The computational efficiency of the existing polymer flooding simulator is difficult to adapt to the large complex reservoir simulation of the meshing scale of more than one million nodes, which seriously restricts the decision speed of the reservoir development. Hence, we propose a new concise brinebased simulation method for polymer flooding in this study, which can not only significantly improve the speed of numerical simulation, but also can comprehensively consider the key mechanism of enhanced oil recovery by polymer flooding. The accuracy and applicability of the new method are demonstrated in three aspects: the comparison of the simulation results with the traditional polymer flooding, the significant effect of the void volume and the significant effect of the adsorption loss. The new method is used to simulate the polymer flooding in a large river heavy oil field with a large scale of nearly 5 million grid. It takes only 5.8 h to complete a single virtual development simulation, while the traditional simulator takes 518.4 h and the calculation efficiency is nearly 90 times under the same condition, which confirms the high efficiency and application value of the new method.

Key words: Polymer flooding, Numerical simulation, Brine model, New method, Complex reservoir