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

摘要： 现有聚合物驱模拟器的计算效率难以适应百万节点以上网格剖分规模的大型复杂油藏模拟，严重制约了油藏开发决策速度。鉴于此，建立了一种基于盐水模型的聚合物驱高效模拟新方法，可显著提升数值模拟计算速度，同时能够全面考虑聚合物驱提高采收率关键机理；分别从与传统聚合物驱模拟结果对比、不可及孔隙体积影响显著性、吸附滞留损失影响显著性三方面论证了新方法的准确性与适用性。应用新方法对具有近500万网格规模的某大型河流相稠油油田开展聚合物驱模拟，完成单次虚拟开发模拟仅需5.8 h，而传统模拟器相同条件下需耗时518.4 h，计算效率提高近90倍，证实了新方法的高效性与应用价值。

关键词: 聚合物驱, 〓数值模拟, 〓盐水模型, 〓新方法, 〓复杂油藏