石油化工高等学校学报2011，Vol.24Issue(2)：1-5,5.DOI:10.3696/j.issn.1006-396X.2011.02.001
稠油二氧化碳降粘的化学机制研究
The Chemical Mechanism of Heavy Oil Viscosity Reduction in Carbon Dioxide Flooding
摘要
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.关键词
稠油/CO2/降粘/化学机制Key words
Heavy oil/ Carbon dioxide/ Viscosity reduction/ Chemical mechanism分类
能源科技引用本文复制引用
张龙力,王善堂,杨国华,宋丹,王继乾,林吉生..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):1-5,5.基金项目
国家自然科学基金资助项目(20776160) （20776160）
中国石化总公司项目(P07055). （P07055）
