石油学报(石油加工) ›› 2020, Vol. 36 ›› Issue (3): 519-524.doi: 10.3969/j.issn.1001-8719.2020.03.011

• 研究报告 • 上一篇    下一篇

甜菜碱溶液的界面性能及其在稠油降粘中的应用

于群1,郭兰磊1,周贺2,石静1,王红艳1,张磊2,张路2   

  1. 1. 中国石化 胜利油田分公司勘探开发研究院, 山东 东营 257000;
    2. 中国科学院 理化技术研究所 光化学转换与功能材料重点实验室, 北京 100190
  • 收稿日期:2019-04-07 修回日期:2019-08-22 出版日期:2020-05-25 发布日期:2020-07-21
  • 通讯作者: 张路,男,教授级高级工程师,博士,从事胶体与界面化学研究,Tel: 010-82543587, E-mail:luyiqiao@hotmail.com; 张磊,女,副研究员,博士,从事胶体与界面化学研究,Tel: 010-82543589, E-mail:zl2558@163.com E-mail:luyiqiao@hotmail.com
  • 作者简介:第一作者:于群,男,高级工程师,博士,从事三次采油领域的研究,Tel:0546-8715507,E-mail:yq_upc@126.com
  • 基金资助:
    国家科技重大专项项目(2016ZX05011-003)和国家自然科学资金项目(21703269)资助

Interfacial Properties of Betaine Solutions and Their Application in Viscosity Reduction for Heavy Oils

YU Qun1, GUO Lanlei1, ZHOU He2, SHI Jing1 , WANG Hongyan1, ZHANG Lei2, ZHANG Lu2   

  1. 1. Exploration & Development Research Institute of Shengli Oilfield Co. Ltd., SINOPEC, Dongying 257000, China; 
    2. Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2019-04-07 Revised:2019-08-22 Online:2020-05-25 Published:2020-07-21

摘要: 为探索稠油乳化降黏过程中乳化剂的构效关系,考察了直链烷基甜菜碱(ASB)、二甲苯基取代甜菜碱(BSB)与稠油的油/水动态界面张力和界面扩张流变参数,测定了甜菜碱溶液与稠油形成的乳状液的稳定性、粒径和黏度。结果表明:甜菜碱分子的亲水基团平铺在界面上,形成具有一定弹性和强度的油/水界面膜,易与稠油形成稳定的O/W乳状液,显著降低了油相黏度。当油/水体积比为1∶1时,2种甜菜碱在质量分数为0.1%~1.0%的范围内,降黏率大于98%。ASB分子与稠油中活性物质混合吸附、协同作用,具有比BSB更高的界面活性和更强的稳定稠油乳状液能力,能在更宽的油/水体积比范围内有效降黏。

关键词: 稠油, 甜菜碱, 乳化, 降黏, 界面扩张流变

Abstract: To explore the relationship between structure and property of emulsifying viscosity reducer for heavy oils, dynamic interfacial tension and interfacial dilational rheological parameters between heavy oils and linear alkyl betaine ASB or branched xylyl-substituted betaine BSB were investigated. In addition, the stability, droplet size and viscosity of emulsion formed by betaine solution and heavy oils were studied. Experimental results suggest that all hydrophilic part of betaine molecule is almost flat at the interface, and this results in an oil-water interfacial film with some elasticity and strength. Based on the above reasons, stable O/W emulsions can be easily formed in the heavy oil system and therefore significant viscosity drop can be observed. At oil-water volume ratio of 1∶1 and betaines mass fraction 0.1%-1.0%, viscosity reduction can be over 98%. It was found that linear betaine ASB shows a higher interfacial activity and more stable O/W emulsion with heavy oils due to the formation of mixed adsorption films between ASB molecules and heavy oils. As a result, betaine ASB demonstrates more effective viscosity reduction at a large range of oil-water ratios.

Key words: heavy oil, betaine, emulsion, viscosity reduction, interfacial dilational rheology