沙7区块聚/表二元体系驱油效果研究

Research on the displacement efficiency of polymer/surfactant flooding in Sha 7 reservior

研究了表面活性剂对原油/水界面张力、乳化作用以及对岩石润湿性的影响,开展了表面活性剂和聚合物/表面活性剂二元体系提高低渗透油藏石油采收率的实验研究。结果表明,超低界面张力是影响石油采收率的重要因素,具有良好乳化性能的驱油体系能起到更好的驱油效果,聚合物/表面活性剂二元驱油体系具有更高的提高石油采收率的效能。

The effects of surfactant on the interfacial tension between crude oil and water, emulsification, as well as wettability of reservoir rock were investigated. The experiments of surfaetant and surfactant-polymer used as oil displacement agent for chemical flooding in low permeability rock were performed. Results showed that ultralow interfacial tension was the major factor influencing the displacement efficiency of crude oil, and well emulsification contributed to improve the oil recovery. The complex flooding of surfactant and polymer was much favorable to enhance oil recovery.