驱油用Gemini表面活性剂的合成与评价

Synthesis and Evaluation of Gemini Surfactant for Flooding

董 珍 杨 飞 刘 哲 金勤武 赵建社

DONG Zhen YANG Fei LIU Zhe JIN Qin-Wu ZHAO Jian-She*

本文以非离子型表面活性剂月桂醇聚氧乙烯醚和马来酸酐、反丁烯二酸为主要原料，合成了一种表/界面活性很高的阴-非离子型Gemini表面活性剂—— 羧化月桂醇聚氧乙烯醚马来酸双酯表面活性剂(CAPM)，并对其进行结构表征。对目标产物进行了表面、界面的性质以及真实砂岩微观模型驱替的研究。结果表明：在水中加入所合成的羧化月桂醇聚氧乙烯醚马来酸双酯表面活性剂CAPM后，水溶液的表面张力降低至27.08 mN/m，临界胶束浓度达0.163 g/L，与原油间的油/水界面张力可降低至10-3 mN/m，并可以将砂岩中的原油有效的进行驱替。

Using polyoxyethylene lauryl ether and maleic anhydride as the main raw materials, a high surface activity gemini surfactant CAPM was synthesized, and the structure of CAPM was characterized by IR. The surface tension and oil/water interface tension were investigateded and the core displacement experiments were conducted with authentic sandstone microscopic model. The results showed that the surfactant CAPM could make surface tension of water reduce to 27.08 mN/m and the critical micelle concentration was about 0.163 g/L. The interface tension between the crude oil and CAPM solution could be reduced to 10-3 mN/m, which is suitable for enhancement of oil recovery. The core displacement experiments showed that the CAPM solution could displace the oil in the sandstone effectively.