二元复合体系微观驱油机理可视化实验

针对胜利油区油藏条件,运用新型表面活性剂—聚合物二元复合体系,对其开展了微观模型(岩心薄片)驱油和常规柱状岩心可视化驱油实验.以水驱效果为基础,对比了表面活性剂、聚合物、二元复合体系的驱油效果,重点研究了微观孔隙中表面活性剂、聚合物以及二元复合体系的洗油和携油性能及其在驱油过程中的微观渗流特征,深入分析了二元复合体系的微观驱油机理.结果表明:与聚合物和表面活性剂相比,二元复合体系的驱油效果更好.在岩心薄片可视化驱油实验中,由于3种不同的驱替溶剂波及效率不同,最终导致驱替结束后岩心薄片中剩余油的面积有所不同,采用二元复合体系驱替后,剩余油的面积最小,表明其驱油效率最高,比聚合物和表面活性剂的驱油效率分别提高了2.59％和11.80％;对于常规柱状岩心,二元复合体系比聚合物和表面活性剂的驱油效率分别提高了1.43％和20.70％.

Experiments on visualization of the microscopic mechanism of surfactant/polymer binary compound system

According to the reservoir condition of Shengli oilfield, the new surfactant/polymer binary compound system, microscopic models (core flake) flooding experiments and normal cylindrical core flooding experiments are carried out in the laboratory. Based on the water flooding effect, the flooding effects of surfactant flooding, polymer flooding and SP binary compound system are compared,and focusing on the washing oil capacity and carrying oil capacity of the surfactants, polymers and SP binary compound system in the microcosmic pore and the microscopic seepage properties in the process, and the microscopic mechanism of SP binary compound system are tested thoroughly. The results show that the flooding effect of binary compound system is better than that of polymer or surfactant flooding. In the visualization flooding experiments of the core flake, different flooding sweep efficiency of 3 different solvents result in the different residual oil area in the core flake, and residual oil area of SP binary compound system is the least, while its sweeping efficiency is the highest of the three, and its sweeping efficiency is raised by about 2.59% and 11.8% percentage than polymer flooding and surfactant flooding, respectively. In the normal cylindrical core flooding, the displacement efficiency of SP system flooding is raised by about 1.43% and 20.70% than polymer flooding and surfactant flooding, respectively.