增溶剂作用下二氧化碳在稠油中的溶解机理

Dissolution Mechanism of Carbon Dioxide in Heavy Oil with 1，2-Dimethoxyethane as Solubilizer

于田田 郝婷婷 翟勇 林吉生 杨红霞 王创业

YU Tiantian HAO Tingting ZHAI Yong LIN Jisheng YANG Hongxia WANG Chuangye

为了分析增溶剂作用下CO2在稠油中的溶解机理，以乙二醇二甲醚为增溶剂，测定了不同温度、压力以及 增溶剂含量下CO2在稠油中的溶解量，并采用分子动力学模拟方法计算了不同条件下CO2的溶解度参数和CO2 与增溶剂分子的径向分布函数。研究表明，增溶剂的加入提高了二氧化碳在稠油中的溶解度，在低温度、高压 力、高增溶剂含量下，溶解度参数相对较大，有利于CO2的溶解。乙二醇二甲醚分子含有两个醚基，其与CO2氧原 子间存在强烈吸引力作用，揭示乙二醇二甲醚作为增溶剂提高二氧化碳在稠油中溶解度的微观机理。这为增溶 剂的研发提供了理论指导：富含醚基的有机小分子可能是潜在的CO2增溶剂。

In order to reveal the mechanism that carbon dioxide dissolved in heavy oil in the presence of solubilizer，the solubility of carbon dioxide in heavy oil was experimentally determined as a function of temperature，pressure and the content of solubilizer 1，2-dimethoxyethane. The solubility parameters of carbon dioxide under different conditions were calculated by molecular dynamics simulations. The radical distribution functions of carbon dioxide and solubilizer were calculated. It was found that lower temperature，higher pressure and greater content of solubilizer are favorite to the dissolution of carbon dioxide，in accordance with that found in experiments. It is the strong attraction between carbon dioxide and 1，2-dimethoxyethane molecules that led to the solubilization of carbon dioxide in heavy oil. The results provide a theoretical direction to development of solubilizers of carbon dioxide in heavy oil. Those small organic molecules rich in ether groups are potential solubilizers of carbon dioxide.

10.19346/j.cnki.1000-4092.2022.03.012