Abstract: This paper researches the seepage characteristics and oil displacement effect of polymer solution and weak-base ternary compound system, taking the reservoir geology and fluid from Daqing Oilfield as research object, taking injectionpressure and oil recovery as the evaluation indexes. Results show that, under the condition of the same oil displacement agent viscosity and slug size, the oil recovery increment of weak-base ASP flooding is larger than that of polymer flooding. Because there are emulsification and Jamin effect during weak-base ASP flooding, which can increase seepage resistance and injection-pressure, and its oil sweep efficiency is also higher. Compared with ternary compound system with scaleremoval water, there are carbonate micro particles in the sewage ternary compound system, which can be detained in porous media. This can increase seepage resistance and cause fluid diversion effect, which eventually leads to a large increase in oil recovery. Compared with constant-speed experiment, it is early for constantpressure experiment to adopt peak-pressure, which accelerates the forward speed of agent in the core high permeability layer and shortens the breakthrough time. As a result, the sweep efficiency and oil displacement efficiency of constantpressure experiment is lower.

Key words: Weak-base ternary compound system, Polymer solution, Emulsification, Jamin effect, Mechanism analysis

摘要： 以大庆储层地质特征和流体性质为模拟研究对象，以注入压力和采收率为评价指标，开展了聚合物溶液和弱碱三元复合体系渗流特性和驱油效果实验研究和作用机理分析。结果表明，在驱油剂黏度和段塞尺寸相同条件下，与聚合物驱相比，弱碱三元复合驱过程中存在乳化作用和贾敏效应，造成渗流阻力增加和注入压力升高，加之自身较强洗油能力，因此采收率增幅较大。与除垢水三元复合体系相比较，污水三元复合体系中含有碳酸盐微颗粒，它在多孔介质内发生滞留，产生附加渗流阻力和液流转向效果，最终导致采收率增幅较大。与恒速实验相比较，恒压实验采用峰值压力时间早，造成药剂在岩心高渗透层中推进速度加快，突破时间较早，波及效率和洗油效率降低。

关键词: 弱碱三元复合驱, 聚合物溶液, 乳化作用, 贾敏效应, 机理分析