耐温耐盐增稠型表面活性剂体系的应用

在表面活性剂S10中添加了改性超细二氧化硅(CXS)作为增稠剂,得到了增稠型表面活性剂体系S10/CXS。研究了CXS添加量对体系黏度、油水界面张力的影响,评价了S10/CXS体系的耐温耐盐性能、封堵性能和提高采收率能力。实验结果表明,CXS可以提高表面活性剂溶液的黏度,增稠作用明显;0.5%S10/2.3%CXS体系的油水界面张力可达到超低(10^-3 mN/m)级别;该体系耐温耐盐性能好;在非均质并联填砂模型驱替实验中,S10/CXS体系较S10表活剂驱可提高采收率15.9百分点。CXS的聚并封堵作用可提高波及体积,S10可降低油水界面张力从而提高洗油效率,在两者的协同作用下,S10/CXS体系具有较好的驱油效果。

Application of temperature and salt resistant thickening surfactant system

By adding modified ultrafine silica(CXS) into the surfactant S10 as a thickening agent, a thickening surfactant system S10/CXS was obtained. The effects of CXS addition on the system viscosity and oil-water interfacial tension were studied. The temperature and salt resistances,plugging performance and enhanced oil recovery capability of the system were evaluated. The experimental results showed that CXS can improve the viscosity of surfactant solution with obvious thickening effect;the oil-water interfacial tension of 0.5%S10/2.3%CXS system can reach an ultra-low level(10^-3 mN/m);the system has good temperature and salt resistance;and in the displacement experiment of heterogeneous parallel sand filling model,the recovery of S10/CXS system can be increased by 15.9 percentage points compared with that of S10 surfactant flooding. The coalescence and plugging effect of CXS can increase sweep volume,and S10 can reduce oil-water interfacial tension and thus improve oil washing efficiency. Under the synergistic effect of the two,the S10/CXS system has better oil displacement effect.