摘要： •New understanding of CO2 migration in heterogeneous reservoirs.•Study flow regimes by 3D high resolution simulations at reservoir conditions.•Develop a 2D theoretical model to predict CO2 saturations explicitly.•Capillary heterogeneity at the sub-core scale is considered in both cases.•Excellent agreement between analytical solutions and simulation results. Here we provide a comprehensive study of the fundamental physics both numerically and analytically, of the combined influence of heterogeneity, viscous forces, gravity, and capillarity on multiphase flow of CO2 and brine. Specifically, steady-state 3D coreflood displacements in heterogeneous cores over a range of relevant conditions are simulated to study the impact of sub-core heterogeneity on CO2/brine displacements over a wide range of flowrates. Various degrees of heterogeneity are generated based on the normal random distribution as well as for real models of cores based on 3D X-Ray tomography. A 2D semi-analytical model considering gravity and permeability heterogeneity is developed for predicting brine displacement efficiency over a wide range of capillary numbers that provides good agreement with the simulated 3D results. The analytical derivation is general and the provided solution can estimate the flow regimes for horizontal core floods efficiently. 出版者： Elsevier Ltd 出版日期： 2015-05 出處： Advances in water resources, 2015-05, Vol.79, p.1-17 資源來源： Elsevier ScienceDirect Journals Complete - Autoholdings 版權： 2015 Elsevier Ltd 識別號： ISSN: 0309-1708 識別號： EISSN: 1872-9657 識別號： DOI: 10.1016/j.advwatres.2015.01.012
