一维岩心管内CO₂驱油及质量浓度分布特征

CO₂混相驱是一项具有广阔前景的提高采收率技术，在生产实际中已经得到成功应用，但是由于其混相过程复杂，涉及驱动、混合、溶解等作用，使得驱替过程中沿程质量浓度分布研究比较困难。为此，从数值模拟的角度出发，建立了经典对流￣扩散模型，用该模型讨论了一维CO₂混相驱替过程中物质质量浓度分布关系，并通过分析得出驱替速度主要影响混相段推进快慢、弥散系数主要影响混相段内物质质量浓度分布等结论，为实际生产提供了理论依据。

CO₂ miscible flooding is a kind of improved recovery method with broad prospects, and has already been successfully used in practical application. Because of the complicate process with effect of driving, mixing and dissolution and so on, the concentration study becomes complex and difficult. So, this paper establishes convective-diffusive model in linear dimension starting from numerical simulation viewpoint and discusses the relationship of concentration distribution with this model. In the end, some conclusions are proposed, including the displacement velocity mainly affecting the driving speed of miscible slug and the dispersion coefficient mainly affecting the concentration distribution, which can provide some theoretical helps for practical application.