Patent ID: 8346523
Filing Date: 2013-01-01
Classification: G01V,G06F

Abstract:
1. A computer-implemented method for use in modeling fluid flow in a subsurface reservoir using a model, the method comprising: (a) creating a fine grid defining a plurality of fine cells associated with the subsurface reservoir, a coarse grid defining a plurality of coarse cells having interfaces between the coarse cells, the coarse cells being aggregates of the fine cells, and a dual coarse grid defining a plurality of dual coarse control volumes, the dual coarse control volumes being aggregates of the fine cells and having boundaries bounding the dual coarse control volumes; (b) calculating dual basis functions on the dual coarse control volumes by solving local elliptic problems; and (c) computing the model, on a computer system, over the coarse grid in a plurality of timesteps; wherein: