SP二元复合驱用新型表面活性剂的耐温耐盐性能研究

Study on a New Surfactant with Temperature-Resistance and Salt-Tolerance for SP Flooding

本文针对一种能够在高温高盐条件下使用的磺基甜菜碱B表面活性剂,研究了其降低界面张力能力,并且用此表面活性剂配制了3 g/L磺基甜菜碱B+1.5 g/L聚合物的无碱SP二元复合驱油体系(简称SP二元体系),在渗透率为1μm2左右的人造均质和非均质岩心上进行了物理模拟驱油实验。实验结果表明:磺基甜菜碱B表面活性剂能够在高温高盐条件下使驱油体系与原油间的界面张力降低到10-3数量级,并能够长时间稳定在10-3数量级之内;在水驱基础上,用该表面活性剂配制的SP二元体系在均质和非均质岩心上分别提高采收率18.3%和23.0%。

Aiming at sulfobetaine B surfactant,which can be used in the condition of high temperature and high salt,the ability to reduce interfacial tension between SP system and the crude oil and stability of interfacial tension were studied in this paper.The indoor physical simulation experiments of SP system,composed of 3 g/L sulfobetaine B surfactant and 1.5 g/L polymer,in the artificial homogeneous and heterogeneous cores with permeability of 1 μm2 had been conducted.The results showed that,the interfacial tension between SP system and the crude oil reduced to 10-3 orders of magnitude in the condition of high temperature and high salt.Based on the water flooding,the oil recovery of SP flooding was enhanced by about 18.3% and 23.0% in homogeneous and heterogeneous cores,respectively.