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Upgridding of Geological Models Based on Equations of Two-phase Flow
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, ECMOR XIV - 14th European Conference on the Mathematics of Oil Recovery, Sep 2014, Volume 2014, p.1 - 12
Abstract
This paper presents an upgridding procedure that makes use of an analytical solution for a two-phase flow equation in the fine scale model. Both horizontal and vertical flow in fine scale cells are taken into account using appropriately defined boundary conditions. The method takes into account two-phase flow properties, cell sizes, diagonal tensor of absolute permeability, porosity, initial conditions and boundary conditions. We attempt to mimic the discretisation error using the reservoir heterogeneity concept. We discuss some of the difficulties encountered in applying the published methods to realistic reservoir models. We present several simple numerical cases to prove the advantages of the new method over other upgridding methods.