Study of the role of spatial heterogeneities in the vicinity of a CO2 injection well

Abstract : The composite near-well injection zones demonstrate a strong spatial heterogeneity and highly reactive coupled physicochemical processes. This heterogeneity has an impact on the injectivity and integrity of storage. The interpretation of pilot and experience can be usefully supplemented by numerical modelling of reactive transport for quan- tifying some phenomena that are difficult to measure on the storage scale. The present study shows the development of a two-phase flow module in the reactive transport software HYTEC [1]. The resolution is built on a formalism water pressure/gas saturation, fully implicit, on a Voronoi-based finite volume discretization. The method was tested against a self-similar solution [2]. The effects of gravity and of hetero- geneity (spatial variations of the absolute/relative permeability) are observed on the reference test cases.