表面活性剂对驱油聚合物界面剪切流变性质的影响

doi:10.3866/PKU.WHXB201403073

物理化学学报 >> 2014, Vol. 30 >> Issue (5): 908-916.doi: 10.3866/PKU.WHXB201403073

表面活性剂对驱油聚合物界面剪切流变性质的影响

曹绪龙¹, 李静², 杨勇¹, 张继超¹, 张磊², 张路², 赵濉²

1 中国石化胜利油田分公司地质科学研究院, 山东东营257015;
2 中国科学院理化技术研究所, 北京100190

收稿日期:2013-12-16 修回日期:2014-03-06 发布日期:2014-04-25
通讯作者: 张磊，张路 E-mail:zl2558@163.com;luyiqiao@hotmail.com
基金资助:
国家科技重大专项（2011ZX05011-004）和国家自然科学基金（51373192）资助项目

Effects of Surfactants on Interfacial Shear Rheological Properties of Polymers for Enhanced Oil Recovery

CAO Xu-Long¹, LI Jing², YANG Yong¹, ZHANG Ji-Chao¹, ZHANG Lei², ZHANG Lu², ZHAO Sui²

1 Geological and Scientific Research Institute of Shengli Oilfield Co. Ltd., SINOPEC, Dongying 257015, Shandong Province, P. R. China;
2 Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China

Received:2013-12-16 Revised:2014-03-06 Published:2014-04-25
Contact: ZHANG Lei, ZHANG Lu E-mail:zl2558@163.com;luyiqiao@hotmail.com
Supported by:
The project was supported by the Important National Science & Technology Specific Projects of China (2011ZX05011-004) and National Natural Science Foundation of China (51373192).

摘要/Abstract

摘要：

利用双锥法研究了表面活性剂十二烷基苯磺酸钠（SDBS）和十六烷基三甲基溴化铵（CTAB）对油田现场用部分水解聚丙烯酰胺（PHPAM）和疏水改性聚丙烯酰胺（HMPAM）溶液的界面剪切流变性质的影响，实验结果表明：HMPAM分子通过疏水作用形成界面网络结构，界面剪切复合模量明显高于PHPAM. SDBS和CTAB通过疏水相互作用与HMPAM分子中的疏水嵌段形成聚集体，破坏界面网络结构，剪切模量随表面活性剂浓度增大明显降低. 同时，界面膜从粘性膜向弹性膜转变. 低SDBS浓度时，少量SDBS分子与PHPAM形成混合吸附膜，界面膜强度略有升高；SDBS浓度较高时，界面层中PHPAM分子被顶替，吸附膜强度开始减弱. 阳离子表面活性剂CTAB通过静电相互作用中和PHPAM分子的负电性，造成聚合物链的部分卷曲，从而降低界面膜强度.弛豫实验结果证实了表面活性剂破坏HMPAM网络结构的机理.

关键词: 部分水解聚丙烯酰胺, 疏水改性聚丙烯酰胺, 十二烷基苯磺酸钠, 十六烷基三甲基溴化铵, 界面剪切流变

Abstract:

The effects of surfactants, namely sodium dodecylbenzenesulfonate (SDBS) and hexadecyltrimethylammonium bromide (CTAB), on the interfacial shear rheological properties of partially hydrolyzed polyacrylamide (PHPAM) and hydrophobically modified polyacrylamide (HMPAM) solutions, which are used in oilfields, were studied using a biconical method. The experimental results show that the interfacial shear complex modulus of HMPAM is significantly higher than that of PHPAM, because an interfacial net structure can be formed by HMPAM molecules through hydrophobic interactions. The SDBS and CTAB molecules can form interfacial aggregates with hydrophobic blocks of HMPAM and destroy the interfacial net structure, which results in a significant decrease in the shear modulus with increasing surfactant concentration. At the same time, the properties of the interfacial film change from viscous to elastic. At low SDBS concentrations, the mixed adsorption film formed by PHPAM and a few SDBS molecules has enhanced strength. However, SDBS molecules can displace PHPAM molecules at the interface and weaken the film at higher surfactant concentrations. The cationic surfactant CTAB neutralizes the negative charge on PHPAM, leading to partial curling of the polymer chain, which decreases the film strength. Relaxation measurements confirmed our mechanism involving destruction of the interfacial net structure of HMPAM by the surfactant.

Key words: Partial hydrolysis polyacrylamide, Hydrophobically modified polyacrylamide, Sodium dodecyl benzene sulfonate, Hexadecyl trimethyl ammonium bromide, Interfacial shear rheology

曹绪龙, 李静, 杨勇, 张继超, 张磊, 张路, 赵濉. 表面活性剂对驱油聚合物界面剪切流变性质的影响[J]. 物理化学学报, 2014, 30(5), 908-916. doi: 10.3866/PKU.WHXB201403073

CAO Xu-Long, LI Jing, YANG Yong, ZHANG Ji-Chao, ZHANG Lei, ZHANG Lu, ZHAO Sui. Effects of Surfactants on Interfacial Shear Rheological Properties of Polymers for Enhanced Oil Recovery[J]. Acta Phys. -Chim. Sin. 2014, 30(5), 908-916. doi: 10.3866/PKU.WHXB201403073

链接本文: https://www.whxb.pku.edu.cn/CN/10.3866/PKU.WHXB201403073

https://www.whxb.pku.edu.cn/CN/Y2014/V30/I5/908

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表面活性剂对驱油聚合物界面剪切流变性质的影响

Effects of Surfactants on Interfacial Shear Rheological Properties of Polymers for Enhanced Oil Recovery

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