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阳离子/非离子复合表面活性剂改变油湿性砂岩表面润湿性机制
王业飞, 白羽, 侯宝峰, 王任卓, 白群山, 张希喜1,2,3
1. 中国石油大学石油工程学院, 山东青岛 266580;2. 长江大学石油工程学院, 湖北武汉 430100;3. 中国石油集团大庆油田有限责任公司, 黑龙江大庆 163414
摘要:
通过表面张力、接触角及Zeta电位测量首次研究并提出阳离子/非离子复合表面活性剂十六烷基三甲基溴化铵(CTAB)/辛基苯聚氧乙烯醚(TX-100)改变油湿性砂岩表面润湿性的吸附模型及机制。结果表明:阳离子/非离子复合表面活性剂CTAB/TX-100改变油湿性砂岩表面润湿性的效果比单阳离子表面活性剂CTAB及非离子表面活性剂TX-100的效果更显著;CTAB与TX-100间存在良好的协同效应,CTAB分子预先吸附在油湿性砂岩表面充当锚粒子,TX-100分子通过疏水作用与其形成聚集体,从而提高了TX-100及CTAB在油湿性砂岩表面的吸附量;TX-100的存在也提高了CTAB与油湿性砂岩表面羧酸类物质形成离子对的能力,并使离子对的解吸附能力增强,因此改变油湿性砂岩表面润湿性的效果更显著。
关键词:  阳离子表面活性剂  非离子表面活性剂  复合表面活性剂  油湿性砂岩  润湿性改变
DOI:10.3969/j.issn.1673-5005.2018.02.021
分类号:TE357.46
基金项目:国家科技重大专项(2016ZX05058-003);长江学者和创新团队发展计划(IRT1294)
Mechanistic study on wettability alteration of oil-wet sandstone surface using mixed cationic-nonionic surfactants
WANG Yefei, BAI Yu, HOU Baofeng, WANG Renzhuo, BAI Qunshan, ZHANG Xixi1,2,3
1. School of Petroleum Engineering in China University of Petroleum, Qingdao 266580, China;2. School of Petroleum Engineering in Yangtze River University of Petroleum, Wuhan 430100, China;3. Daqing Limited Company of CNPC, Daqing 163414, China
Abstract:
The surface tension, contact angle and zeta potential measurements were used to study adsorption models for CTAB/TX-100 mixtures on oil-wet sandstone surface and mechanism for wettability alteration of oil-wet sandstone surface using mixed cationic-nonionic surfactants. It is found that the mixed cationic-nonionic surfactants CTAB/TX-100 show better performance in changing wettability of oil-wet sandstone surface than single CTAB and TX-100. The CTAB and TX-100 present good synergistic effects. The pre-adsorbed CTAB molecules act as anchors on the oil-wet sandstone surface, allowing TX-100 molecules to form mixed aggregates with them through chain-chain interactions, which results in the promotion of TX-100 and CTAB adsorption on oil-wet sandstone surface. Meanwhile, the ability of CTAB for forming ion pairs with carboxylic acid substances can be promoted by TX-100. And the adsorption and desorption capability of ion pairs are enhanced as well. Therefore, the mixed cationic-nonionic surfactants show better effect on wettability alteration of oil-wet sandstone surface than single surfactants.
Key words:  cationic surfactant  nonionic surfactant  mixed surfactant  oil-wet sandstone  wettability alteration
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