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首页> 外文期刊>RSC Advances >The structure effect on the surface and interfacial properties of zwitterionic sulfobetaine surfactants for enhanced oil recovery
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The structure effect on the surface and interfacial properties of zwitterionic sulfobetaine surfactants for enhanced oil recovery

机译：两性离子磺基甜菜碱表面活性剂的表面结构和界面性质对提高采油率的影响

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The surface and interfacial properties of five zwitterionic surfactants, including three propyl sulfobetaines CSB (where the carbon atom number of the alkyl chain is 12, 14 and 16, respectively) and two hydroxypropyl sulfobetaine surfactants CHSB (where the carbon atom number of the alkyl chain is 12 and 14, respectively), were studied at both air-water and oil-water interfaces. The surface activity of these surfactants at the air-water interface in aqueous solutions was investigated by the Wilhelmy plate method at 30 degrees C and ambient pressure. The values of the critical micelle concentration (CMC) and surface tension at CMC (gamma(CMC)) were determined from the surface tension measurements. The obtained results indicate that CMC and surface tension strongly depend on the surfactant molecular structure. An increase in the alkyl chain length results in a decrease in the CMC and gamma(CMC) values. The presence of a hydroxyl group causes an increase in CMC values and a decrease in gamma(CMC) values. The hydroxypropyl sulfobetaine surfactants have better surfacial properties. In addition, the interfacial activity at the oilwater interface among the crude oil-reservoir water-surfactant systems was investigated by use of the spinning drop method under harsh reservoir conditions of high temperature (90 degrees C) and high salinity (11.52 x 10(4) ppm, including 7040 ppm Ca2+ and 614 ppm Mg2+). It is interesting that the transient minimum dynamic interfacial tension (DITmin) could be observed in a specific concentration range. The time to reach DITmin is different with different surfactant molecular structures and surfactant concentrations. The hydroxypropyl sulfobetaine surfactant C14HSB shows excellent interfacial properties: it can reduce interfacial tension (IFT) between oil and water to an ultralow level at a very low concentration, and the ultralow IFT phenomenon only occurs in a specific concentration range from 0.03 to 0.10 wt%. In this work, hydroxypropyl sulfobetaine surfactants exhibit remarkable ability and are good candidates for chemical agents to enhance oil recovery in harsh reservoirs.
机译：五种两性离子表面活性剂的表面和界面特性，包括三种丙基磺基甜菜碱CSB（烷基链的碳原子数分别为12、14和16）和两种羟丙基磺基甜菜碱表面活性剂CHSB（烷基链的碳原子数）分别是12和14），分别在空气-水和油-水界面处进行了研究。通过Wilhelmy平板法在30℃和环境压力下研究这些表面活性剂在水溶液中的空气-水界面处的表面活性。临界胶束浓度（CMC）和CMC处的表面张力（γ（CMC））的值由表面张力测量值确定。所得结果表明，CMC和表面张力强烈依赖于表面活性剂的分子结构。烷基链长的增加导致CMC和γ（CMC）值降低。羟基的存在导致CMC值增加和γ（CMC）值减少。羟丙基磺基甜菜碱表面活性剂具有更好的表面性质。此外，在高温（90摄氏度）和高盐度（11.52 x 10（4）的苛刻油藏条件下，使用旋转滴落法研究了原油-油藏水表面活性剂系统之间的油水界面界面活性。 ppm），包括7040 ppm Ca2 +和614 ppm Mg2 +）。有趣的是，可以在特定浓度范围内观察到瞬态最小动态界面张力（DITmin）。达到DITmin的时间因表面活性剂分子结构和表面活性剂浓度的不同而不同。羟丙基磺基甜菜碱表面活性剂C14HSB具有优异的界面性能：可以在非常低的浓度下将油和水之间的界面张力（IFT）降低至超低水平，并且超低IFT现象仅在0.03至0.10 wt％的特定浓度范围内发生。在这项工作中，羟丙基磺基甜菜碱表面活性剂显示出显着的能力，并且是化学试剂的良好候选者，以增强苛刻油藏中的石油采收率。

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