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论文类型：会议论文

发表时间：2016-01-01

收录刊物：CPCI-S

卷号：45

页面范围：329-332

关键字：Diffusion coefficient; NMR; Porous media; Carbon dioxide

摘要：In the recent years, using CO2 injection into oil reservoirs to enhanced oil recovery (CO2-EOR) has attracted more and more attention from industry and laboratory experiment. The mass transfer and diffusion of CO2 in oil is one of the key parameters of displacement process. In this study, by employing nuclear magnetic resonance (NMR) and a nonlinear fitting equation, the effective diffusion coefficient is calculated quantitatively. It proved that the experimental apparatus and mathematical procedure employed in this study were reliable to investigate and calculate the diffusion coefficient. Three main conclusions were obtained from this study: (i) the effective diffusion coefficient increases as the initial pressure increases; (ii) the relationship between CO2 diffusion coefficient and pressure is nonlinear;(iii) the temperature effect on diffusion of CO2 in oil is obvious because of the reduction in oil viscosity.