适合高温高盐油藏的羟基磺基甜菜碱的性能研究

Property of Hydroxyl Sulfobetaine Surfactant Appropriate for High-Temperature and High-Salinity Reservoir

丁 伟 邢欣欣 于 涛 李金红 张 微 杨 柳

DING Wei XING Xin-Xin YU Tao LI Jin-Hong ZHANG Wei YANG Liu

选取吐哈和沙特两个高温高盐油藏，通过界面张力的测定，对自制的羟基磺基甜菜碱表面活性剂的耐温抗盐性能进行了系统的研究并考察了其用于高温高盐油藏化学驱的可行性。结果表明：羟基磺基甜菜碱表面活性剂溶液在0.3~0.5 g/L低浓度窗口范围内两体系界面性能良好；在 40～100℃较宽的温度范围内，均能达到超低界面张力；吐哈、沙特油水体系抗矿化度能力分别高达270 g/L和200 g/L；并在油藏温度下90 d内具有良好的稳定性。

The properties salt tolerance and temperature resistance of the newly-synthesized hydroxyl sulfobetaine surfactant (HSS) were investigated by measuring interfacial tension between HSS solutions and the crude oil from the high-temperature and high-salinity reservoirs of Tuha and Saudi oilfield. The experiment indicated that the HSS solution had the advantage of interfacial property at a certain range of low concentration of 0.3—0.5 g/L without help of alkali and other additives，the interfacial tension was reduced to ultralow value (≤10-3 mN/m). The SHH could make the dynamic interfacial tension decrease to be ultralow at a wide temperature range of 40—100℃. The highest salinity resistance of Tuha/Saudi crude oil and water system was up to 270 g/L and 200 g/L, respectively, thereinto, the highest Ca2+ and Mg2+ resistance was up to 19 g/L and 23 g/L. In addition, the SHH possessed good heat resistance within 90 d.