石油学报(石油加工) ›› 2020, Vol. 36 ›› Issue (4): 801-811.doi: 10.3969/j.issn.1001-8719.2020.04.018

• 研究报告 • 上一篇    下一篇

淀粉接枝聚丙烯酰胺凝胶的流变性能

林梅钦1,2,魏娴娴1,董朝霞1,3,杨子浩1,2,孙斐斐1   

  1. 1. 中国石油大学(北京)非常规油气科学技术研究院, 北京 102249;
    2. 中国石油三次采油重点实验室,北京 102249;
    3. 中国地质大学(北京),北京 100083
  • 收稿日期:2019-05-13 修回日期:2019-12-10 出版日期:2020-07-25 发布日期:2020-09-23
  • 通讯作者: 林梅钦,男,副教授,硕士,从事胶体与界面化学,油田化学,提高原油采收率方面的研究,Tel:010-89733437; E-mail:linmq@cup.edu.cn E-mail:linmq@cup.edu.cn;13910509321@163.com
  • 基金资助:
    国家自然科学基金项目(51374219)和国家科技重大专项(2017ZX05009)资助

Rheological Properties of Starch Graft Polyacrylamide Gel

 LIN Meiqin1,2 ,WEI Xianxian1, DONG Zhaoxia1,3, YANG Zihao1,2, SUN Feifei1   

  1.  1. Unconventional Petroleum Research Institute, China University of Petroleum, Beijing 102249, China;
    2. Key Laboratory of PetroChina Third Recovery, Beijing 102249, China;
    3. China University of Geosciences, Beijing 100083, China
  • Received:2019-05-13 Revised:2019-12-10 Online:2020-07-25 Published:2020-09-23
  • Supported by:
     

摘要: 为了克服以聚丙烯酰胺作为主剂制备凝胶类调剖堵水剂时溶液黏度大不易泵入、易被剪切等缺陷,采用羟丙基淀粉(HPS)接枝的方法改善了聚丙烯酰胺强凝胶的性能,利用HAAKE流变仪及ESEM研究了凝胶的流变性能与微观结构,考察了主剂(丙烯酰胺(AM)+HPS)含量、AM/HPS质量比、交联剂浓度和纳米级SiO2浓度对凝胶流变性的影响。结果表明:随主剂含量与AM/HPS质量比增大,凝胶体系弹性模量和黏性模量增大,屈服应力也增大,柔量减小,形变幅度减小,回复率增大;随着交联剂浓度增大,凝胶强度先增强后减弱,屈服应力渐增;加入纳米级SiO2有利于增强凝胶的强度、弹性及屈服应力;ESEM测试结果表明,加入羟丙基淀粉与纳米级SiO2后的凝胶可观测到致密的三维网络结构,可能是凝胶强度增强的原因。

关键词: 丙烯酰胺, 羟丙基淀粉, 接枝共聚, 凝胶, 流变性, 微观结构

Abstract: High solution viscosity of gel plugging agent prepared by polyacrylamide as the main agent usually results in problems such as difficulty in pumping and proneness of being sheared. To overcome these defects, this study improved the properties of acrylamide (AM) gel by hydroxypropyl starch (HPS) graft. Rheological properties and microstructure of the gels were studied by HAAKE rheometer and ESEM. The effects of the main agent mass fractions and AM/HPS mass ratio, crosslinking agent concentration and nanoscale SiO2 concentration on rheological properties of the gels were investigated. The results showed that, as both of the concentration and mass ratio of AM and HPS increase, the viscoelastic moduli and yield stress of the gel increase, whereas the compliance and deformable amplitude decrease, and the corresponding recovery rate rises instead.Moreover, with the increase of crosslinking agent concentration, the strength of the gel system first increases and then decreases, and the yield stress increases. The addition of nanoscale SiO2 enhances the strength, elasticity and yield stress of the gel. Test results from ESEM show that there is a denser three-dimensional network structure observed in the gel with hydroxypropyl starch and nanoscale SiO2, which could be the cause of increased strength of the gel.

Key words: acrylamide, hydroxypropyl starch, graft copolymerization, gel, rheology, microstructure

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