文章摘要
聚醚结构对油水界面性能及稠油降粘效果的影响
Effect of polyether structure on the Interfacial Properties and viscosity reduction of heavy oil
投稿时间:2020-04-13  修订日期:2020-05-25
DOI:
中文关键词: 聚醚  稠油  降粘  界面流变  乳化
英文关键词: Polyether  Heavy oil  Viscosity reduction  Interfacial dilational rheology  Emulsion
基金项目:国家科技重大专项“高温高盐油田化学驱提高采收率技术”(项目编号2016ZX05011-003)。
作者单位E-mail
李金志 中国石化胜利油田分公司 lijinzhi.slyt@sinopec.com 
周贺 中国科学院 理化技术研究所  
徐志成 中国科学院 理化技术研究所  
靳志强 中国科学院 理化技术研究所  
马望京 中国科学院 理化技术研究所  
张磊 中国科学院 理化技术研究所  
张路 中国科学院 理化技术研究所 luyiqiao@hotmail.com 
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中文摘要:
      为深入认识化学驱稠油乳化降粘的作用机制,考察了不同结构聚醚与稠油的油水界面张力和界面扩张流变性质,测定了聚醚溶液与稠油形成的乳状液的稳定性、粒径和粘度。结果表明:聚醚类表面活性剂具有较长的柔性EO链和PO链,能形成界面 “亚层”,界面膜以弹性为主,易与稠油形成稳定的O/W乳状液,显著降低稠油粘度。聚醚的分子量和EO/PO比是影响油水界面张力的主要结构因素,而界面膜强度主要由分子量控制。随分子量增大,界面膜强度增大,乳状液稳定性增强。研究的3种聚醚均具有良好的稠油降粘效果,当油水体积比为1:1时,在质量分数0.2%~0.5%范围内,降粘率>98%。
英文摘要:
      To deeply understand the mechanism responsible for the emulsifying viscosity reduction for heavy oil in chemical flooding, the interfacial tension and dilational rheological parameters between heavy oil and polyether solutions with different structures have been measured. The stability, particle size and viscosity of emulsion of polyether solution with heavy oil have also been investigated. The results show that long flexible EO and PO chains in polyether molecule can form a sub-layer at interface, resulting in an oil-water interfacial film with strongly elastic nature. Therefore, it is easy for polyether solutions to form the stable O/W emulsions with heavy oil and obviously decrease viscosity. The molecular weight and the ratio of EO/PO play the major role in affecting the interfacial tension and the strength of interfacial film are mainly controlled by the molecular weight. The polyether with larger molecular weight shows higher interfacial film strength and more stable O/W emulsion with heavy oil. The three polyether solutions in this study have good viscosity reduction effect on heavy oil. At oil-water volume ratio of 1:1, the rate of viscosity reduction is over 98% during the concentration range of 0.2~0.5%.
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