石油化工高等学校学报

石油化工高等学校学报 ›› 2011, Vol. 24 ›› Issue (2): 1-5.DOI: 10.3696/j.issn.1006-396X.2011.02.001

• 石油化工 •    下一篇

稠油二氧化碳降粘的化学机制研究

张龙力1,王善堂2,杨国华1,宋丹2,王继乾1,林吉生2   

  1. 1.中国石油大学(华东)化学化工学院,山东青岛266555;2.中国石化胜利油田分公司采油工艺研究院,山东东营257000
  • 收稿日期:2010-10-27 修回日期:2010-12-23 出版日期:2011-04-25 发布日期:2011-04-25
  • 作者简介:张龙力(1974 -), 男, 河南镇平县, 副教授, 博士
  • 基金资助:
    国家自然科学基金资助项目(20776160);中国石化总公司项目(P07055)

The Chemical Mechanism of Heavy Oil Viscosity Reduction in Carbon Dioxide Flooding

  1. 1.College of Chemistry and Chemical Engineering, China University of Petroleum, Qingdao Shandong 266555，P.R.China;
    2. Shengli Oil Production Research Instituts, SINOPEC, Dongying Shandong 257000, P.R.China
  • Received:2010-10-27 Revised:2010-12-23 Published:2011-04-25 Online:2011-04-25

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摘要： 为认识二氧化碳降粘的化学机制, 考察了不同压力下二氧化碳在胜利稠油中的溶解度、二氧化碳处理对稠油化学组成的影响以及超临界二氧化碳对稠油的萃取行为。结果表明, 二氧化碳在稠油中有很高的溶解度, 可达105 kg/ m3 , 但不改变稠油的化学组成;超临界二氧化碳萃取过程中, 对饱和分的溶解能力强于胶质和沥青质, 会破坏稠油的胶体化学结构。二氧化碳降粘主要来自于稀释作用, 但胶体体系改变后, 会释放出溶剂化层中的小分子, 减小分散相体积, 降低体系粘度。

关键词: 稠油 , CO2 , 降粘 , 化学机制

Abstract: In order to understand the mechanism of heavy oil viscosity reduction in CO2 flooding, the solubility of carbon dioxide in heavy oil was determined under different pressure, and the effect on heavy oil chemical composition of CO2 processing was analyzed. Furthermore, the differences between the extracted oil processed by supercritical CO2 and the heavy oil were analyzed. The result shows that CO2 doesn't change the chemical composition of heavy oil, although its solubility is high in heavy oil, it can get to 105 kg/m3. During supercritical CO2 extraction, saturates have higher solubility in supercritical CO2 than resins and asphaltenes. Then the colloidal structure of heavy oil was destroyed during supercritical CO2 extraction. The viscosity reduction mainly came from the dilution effect of soluble CO2. But the supercritical CO2 replaced the small molecules in solvation layer of asphaltene colloids, and reduced the volume of dispersing phase, which also decreased the viscosity.

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引用本文

张龙力,王善堂,杨国华. 稠油二氧化碳降粘的化学机制研究[J]. 石油化工高等学校学报, 2011, 24(2): 1-5.

ZHANG Long-li,WANG Shan-tang,YANG Guo-hua,et al. The Chemical Mechanism of Heavy Oil Viscosity Reduction in Carbon Dioxide Flooding[J]. Journal of Petrochemical Universities, 2011, 24(2): 1-5.

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