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为解决目前CO2-地层原油的非混相作用过程及体系在孔隙介质中的渗流特征仍较为模糊这一问题,利用CO2试验区的地层原油进行非混相体系的驱替实验,研究渗流特征及流体组分的变化规律。根据CO2在水、油介质中的溶解性质,对系统压力轻微降低的现象进行分析。实验监测记录了流体组成含量的变化过程,规律显示:CO2向原油中的溶解及两相间的作用过程是缓慢的;在分离气相中,CO2比重逐渐增大;液相中轻质组分含量降低,而重质组分含量逐渐增加,验证了CO2的抽提作用。非混相状态CO2在实验条件下的性质与常规状态表现出很大不同,非混相驱替方法可取得较好开发效果。
In order to solve the problem that the non-miscible phase of CO2-formation crude oil and the seepage characteristics of the system in the porous media are still relatively vague, the formation oil in the CO2 test area is used to conduct the displacement experiment of the non-miscible system, Points of the law of change. According to the solubility of CO2 in water and oil medium, the pressure of the system is slightly reduced. The experimental monitoring records the changing process of the fluid composition. The law shows that: the dissolution of CO2 into the crude oil and the interaction between the two phases are slow; in the separated gas phase, the proportion of CO2 gradually increases; the content of light components in the liquid phase decreases , While the content of heavy components gradually increased, verifying the extraction of CO2. The properties of non-mixed phase CO2 in the experimental conditions show a very different from the conventional state, non-miscible flooding method can achieve better development results.