一种稠油热/化学驱用表面活性剂性能研究

对一种热采用表面活性剂LC进行了性能评价，LC与孤岛三区原油动态界面张力在10^-1mN／m数量级，与NaOH复配时则可达到超低界面张力。70℃下，LC在石英砂上的静态吸附量为3．6185mg／g。LC在150℃下具有很好的耐温性能，200℃下半衰期也在15天以上。LC溶液与原油质量比3：7和2：8混合，降粘率都在85％以上。150℃下动态驱替试验表明，采收率随着加入表面活性剂浓度的增大而增大，但是，活性剂浓度不宜太高；LC与0．5％的NaOH复配能显著提高采收率，当LC商品浓度为0．5％时，热水／碱／表面活性剂驱采收率比热水／碱驱提高10．85％，说明碱与表面活性剂具有很好的协同效应。试验表明LC可以作为稠油热采添加剂。

Performance Study on One Surfactant for Heavy Oil Thermal/Chemical Flooding

The Performance of one surfactant for thermal recovery was evaluated by experiment. The interiacial tension (IFT) of crude oil from Gudao third block in LC solution is 10-1mN/m,ultra—low IFT can be further achieved when NaOH was added.Static adsorption result showed that the maximum adsorption of LC on quartz sand at 70°C is 3. 6185mg/g, Besides, LC has good temperature resistance at 150°C ; even at 200°C, its half—time is longer than 15 days. When LC solution and crude oil were mixed in mass ratio of 3/7 and 2/8 at 70°C, oil viscosity can be dramatically decreased by more than 85%. Heavy oil dynamic flooding tests at 150°C indicated that oil recovery raises with the increase of LC concentration, but the concentration of surfactant should not be too high in consideration of its cost. When 0. 5wt% NaOH was compounded with 0.5wt% LC, oil recovery of hot water/alkali/surfactant flooding is 10.85% higher than that of hot water/alkali flooding, exhibiting good synergistic effect between NaOH and LC. It can be concluded that LC is a promising thermal additive in thermalrecovery of heavy oil.