Mechanism studies on the application of the mixed cationic/anionic surfactant systems to enhance oil recovery
Mechanism studies on the application of the mixed cationic/anionic surfactant systems to enhance oil recovery
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DOI：
10.1016/j.fuel.2019.116156
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发表时间：
2019-12-15
期刊：
影响因子：
7.4
通讯作者：
Lv, Kaihe
中科院分区：
文献类型：
--
作者：
Jia, Han;Lian, Peng;Lv, Kaihe
混合阳离子/阴离子表面活性剂体系在各个领域显示出巨大的潜力。离子液体具有独特的物理化学性质，被认为是传统表面活性剂的新型替代品。在这份报告中，我们评价了混合表面活性剂体系的性能，包括阳离子表面活性离子液体1-十二烷基-3-甲基咪唑氯化物（M12）和阴离子表面活性剂十二烷基硫酸钠（SDS）的表面/界面张力降低，乳化能力，润湿性改变和岩心驱油试验。采用分子动力学模拟方法研究了混合表面活性剂体系的表面/界面活性。在高温高盐条件下，复配表面活性剂溶液与原油之间的界面张力（IFT）可显著降低至超低水平（< 10（-2）mN/m），表明复配表面活性剂具有在苛刻油藏中应用的潜力。瓶内试验表明，复配表面活性剂能有效地稳定水包油原油乳状液。通过接触角、FTIR和Zeta电位的测定，探讨了润湿性改变的机理。混合体系中的静电引力可能导致伪双尾助表面活性剂的形成及其在表面/界面上的密集排列，这可能是其优异性能的原因。此外，进行了岩心驱替实验，以证实混合体系在提高原油采收率方面的高效性。
Mixed cationic/anionic surfactant systems have showed great potential in various fields. Ionic liquids with extraordinary physical and chemical properties are regarded as novel alternatives to traditional surfactants. In this report, we evaluated the performances of the mixed surfactant systems comprising a cationic surface-active ionic liquid 1-dodecyl-3-methylimidazolium chloride (M12) and an anionic surfactant sodium dodecyl sulfate (SDS) in terms of surface/interfacial tension reduction, emulsifying ability, wettability alteration and core flooding tests. Molecular dynamic simulation was employed to explore the surface/interfacial activity of the mixed surfactant systems. The interfacial tension (IFT) between the mixed surfactant solutions and crude oil could be dramatically decreased to the ultralow level ( < 10(-2) mN/m) at high-salinity and high-temperature conditions, indicating their potential application in the harsh reservoir. Bottle tests demonstrated the mixed surfactants could effectively stabilize the crude oil-in-water emulsions. The mechanism of wettability alteration was investigated via the measurements of contact angles, FTIR and zeta potential. The electrostatic attraction in the mixed systems might cause the fabrications of the pseudo two-tailed co-surfactants and their intensive arrangements at the surface/interface, which should be responsible for their remarkable performances. Moreover, core flooding tests were conducted to confirm the high efficiency of mixed systems in the improvement of crude oil recovery.