超临界CO_(2)增黏机理研究进展

Research progress of thickening mechanism of supercritical carbon dioxide by thickener

阐述了超临界CO_(2)增黏机理研究进展,归纳了超临界CO_(2)增黏的四种机理,包括超临界CO_(2)增黏的基础理论是相似相溶机理;熵增焓减是超临界CO_(2)增黏的重要机制,通过改变超临界CO_(2)的物理状态和分子间相互作用力增加其黏性;“π-π堆叠”机制和Lewis酸碱理论可以指导合成新型聚合物增黏剂的研发,进一步提高超临界CO_(2)的增黏效果。超临界CO_(2)增黏技术在CO_(2)压裂和CO_(2)驱提高采收率技术领域内具有广阔的应用前景,但其理论研究相对薄弱,限制了该技术的工业化进程,还需要进行大量的研究。

This paper focuses on the research progress related to the thickening mechanism of carbon dioxide.And the four mechanisms of thickening carbon dioxide are summarized.The basic theory of supercritical CO_(2)viscidity increase is similar solubilization mechanism.Entropy increase and enthalpy decrease is an important mechanism for increasing viscosity of supercritical CO_(2).The viscosity of supercritical CO_(2)is increased by changing its physical state and intermolecular interaction force.The“π-πstacking”mechanism and Lewis acid-base theory can guide the development of synthetic polymer viscosifier and further improve the viscosification effect of supercritical CO_(2).Supercritical CO_(2)viscosification technology has broad application prospects in the field of CO_(2)fracturing and CO_(2)flooding enhanced oil recovery technology,but its theoretical research is relatively weak,which limits the industrialization process of this technology,and a lot of research needs to be done.