CTAB改变油湿性砂岩表面润湿性机理的研究  

Study on the mechanism of CTAB changing the wettability of oil wet sandstone

作　　者：侯宝峰 王业飞[1] 曹绪龙[2] 张军[3] 宋新旺[2] 丁名臣[1] 陈五花[1] 黄勇[1] 

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266580 [2]中国石化胜利油田分公司地质科学研究院,山东东营257015 [3]中国石油大学(华东)理学院,山东青岛266580

出　　处：《西安石油大学学报（自然科学版）》2015年第5期95-100,11-12,共6页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：长江学者和创新团队发展计划资助项目(编号:IRT1294);中央高校基本科研基金项目(编号:13CX05019A)

摘　　要：利用红外、原子力显微镜(AFM)、Zeta电位测定、接触角测定及岩心自发渗吸实验等手段研究了阳离子型表面活性剂CTAB(十六烷基三甲基溴化铵)改变油湿性砂岩表面润湿性的机理。结果表明:CTAB改变油湿性砂岩表面润湿性的性能优异。由于静电引力作用,CTAB正电性离子头基与吸附在砂岩表面的原油当中的羧酸基团形成离子对,当CTAB的浓度超过临界胶束浓度(CMC)时,形成的离子对就会从砂岩表面解吸附并增溶于CTAB形成的胶束当中,从而露出干净的水湿表面,砂岩表面因此实现润湿反转。The mechanism of the wettability change of oil wet sandstone caused by hexadecyl trimethyl ammonium bromide( CTAB) is studied by the different methods including Fourier transform infrared( FTIR),atomic force microscopy( AFM),zeta potential measurement,contact angle measurement and core spontaneous imbibition experiment. The results show that CTAB has excellent performance in changing the wettability of oil-wet sandstone. Due to electrostatic attraction,the ion pairs are formed by the interaction between the positively charged head groups of the cationic surfactants and the carboxylic acid groups of the crude oil,the ion pairs could be desorbed from the sandstone surface and solubilize into the micelles formed by CTAB when the concentration of CTAB is above critical micelle concentration( CMC). Thus,a clean water-wet surface is exposed and the water-wetness of the sandstone surface is improved.

关 键 词：油湿性砂岩 润湿性改变 阳离子型表面活性剂 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]