CO_2在饱和原油多孔介质中的扩散及影响因素

Research on the diffusion of CO_2 in porous media saturated by oil and the analysis of impact factors

CO_2在含油多孔介质中的扩散研究是注CO_2提高采收率项目的基础,在化学工程和石油工程都有重要的应用。本文建立了CO_2在饱和原油多孔介质中的扩散模型和压降模型,并利用该模型拟合实验数据求得了CO_2在饱和原油多孔介质中的扩散系数,并在实验基础上研究了温度和压力对扩散系数的影响。研究表明,通过扩散模型拟合实验数据可求取扩散系数。此外,扩散系数随着温度和压力的增加而增加,但随压力增加的幅度逐渐降低。本文可用于注CO_2-EOR项目中参数设计和效果预测。

Research on the diffusion of CO2 in oil is the basis of the CO2 enhanced oil recovery projects and plays an important role in chemical engineering and petroleum engineering. In this paper, the diffusion and pressure decay models of CO2 diffusing in porous media saturated by oil were established. Besides, the diffusion coefficients of CO2 in oil were calculated by fitting the diffusion experiment data by the pressure decay model. Furthermore, the impact of pressure and temperature on the diffusion coefficients were analyzed based on the experiment. The results illustrated that the diffusion coefficients can be calculated by combining the models and experiment. Besides, the diffusion coefficients of CO2 increased with the increasing of the pressure and temperature, however, the slope of increased curved decreased with the increasing of pressure. This paper can be used for parameter design and effect prediction in CO2-EOR project.