CO_2在油水混合物中的溶解度及饱和CO_2油水的密度  

Solubility of CO_2 in oil,water and their mixture and density of the saturated CO_2 fluids

作　　者：王少朋 侯吉瑞 赵凤兰 苑光宇 刘刚[1] 周芳芳[2] 

机构地区：[1]中国石油大学提高采收率研究院石油工程教育部重点实验室,北京102249 [2]大庆钻探工程公司地质录井一公司,黑龙江大庆163411

出　　处：《西安石油大学学报（自然科学版）》2012年第5期39-42,57,共5页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：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"(编号:50804052);国家973项目"温室气体提高石油采收率的资源化利用及地下埋存"(编号:2006CB705805)

摘　　要：采用PVT法,在高压条件下测定了CO2在大庆原油和地层水中的溶解度,并计算了饱和CO2油、水相的密度和膨胀系数.实验结果表明:在实验条件下,CO2在原油和地层水中的溶解度随压力的升高而增大,饱和CO2油、水相的密度随CO2溶解度的增大而线性增大.饱和CO2液相的膨胀系数受实验压力和CO2溶解度的影响较大,受液相组成的影响很小.实验还测定了CO2在不同油水体积比混合物中的溶解度,发现恒定温度下CO2在油水混合物中的溶解度只与压力和液相组成有关,而不受其他条件影响.The solubility of CO2 in the Daqing crude oil and formation water was measured under high pressure using PVT method.The density and swelling factor of the saturated CO2 oil and water phase were calculated.The experimental results show that under the experimental condition,the solubility of CO2 in the crude oil and formation water increases with the increase of pressure.The density of the saturated CO2 oil and formation water increases linearly with the increase of the solubility of CO2.The swelling factor of the saturated CO2 fluids depends on the equilibrium pressure and the solubility of CO2,but it has almost nothing to do with the liquid composition.The solubility of CO2 in the oil-water mixture of different oil-water volume ratios was also measured,and it is found that the solubility of CO2 in the oil-water mixture is related to the pressure and liquid composition at constant temperature.The experimental results could be used as a reference for the program design of CO2 geological sequestration and CO2 flooding.

关 键 词：二氧化碳 溶解度 油水混合物 油水密度 膨胀系数 

分 类 号：TE357[石油与天然气工程—油气田开发工程]