二氧化碳在原油中的分子扩散系数和溶解度研究  

Study of Molecular Diffusion Coefficients and Solubility of Carbon Dioxide in a Jinlin Crude Oil

作　　者：李东东[1] 侯吉瑞[1] 赵凤兰[1] 王少朋[1] 岳湘安[1] 

机构地区：[1]中国石油大学(北京)提高采收率研究中心,石油工程教育部重点实验室(中国石油大学),北京昌平102249

出　　处：《油田化学》2009年第4期405-408,共4页Oilfield Chemistry

基　　金：国家973"温室气体提高石油采收率的资源化利用及地下埋存"(项目编号2006CB705805);国家自然科学基金"CO2在多孔介质中扩散规律的影响因素及机理研究"(项目编号50804052)

摘　　要：为了满足CO2驱油施工设计和油藏模拟的需要,建立了一套完整的测量气体溶解度和扩散系数的实验装置。导出了包含这两个参数的气体压力时间线性关系式。采用压力降落法在50℃、70℃、105℃温度和静态条件下,测定CO2-吉林红岗原油体系的压力随时间的变化,对所得曲线进行线性拟合,求得了实验条件下CO2在吉林红岗原油中的溶解度和扩散系数。讨论了平衡压力,压力、温度对溶解度和扩散系数的影响,得到了每一实验温度下溶解度平衡压力、扩散系数平衡压力线性拟合关系式。在105℃温度下,静态条件下的扩散系数值在10-7m2/s数量级,而动态条件下(转速600r/min)则增至10-6m2/s。A set of experimental installation for measuring gas solubility （ S ） and diffusion coefficient （ DC ） was constructed for the purpose of project design and reservoir simulation of CO2 driving. A linear relationship between gas pressure and time duration and containing the two parameters was derived. The changes with time of pressure in CO2-Honggang＇s crude oil system were measured by using a pressure drop method under static conditions at temperature 50℃ ,70℃, and 105℃ ;the curves obtained were fitted linearly and the S and DC values of CO2 in the crude oil under experimental conditions were determined. The equilibrium pressure, the S and the DC influenced by pressure and temperature were discussed and linearly fitted equations of S and of DC vs equilibrium pressure were constructed for every experimental temperature. At 105℃ ,the static DC values were of magnititude 10 -7 m2/s and the dynamic ones（ at stirring speed 600 r/min）--10^ -6 m2/s.

关 键 词：二氧化碳 吉林红岗原油 溶解度 扩散系数 实验测定 测定装置 压力降落法 平衡压力 计算方程 

分 类 号：O645.12[理学—物理化学] O645.14[理学—化学]