Patent ID: 6078869
Filing Date: 2000-06-20
Classification: G01V

Abstract:
A method of generating more accurate earth formation grid cell property information adapted for use by a simulator for displaying more accurate simulation results of the formation near a wellbore, comprising the steps of:(a) building a boundary;(b) distributing a plurality of points inside said boundary;(c) connecting together said plurality of points inside said boundary such that a plurality of triangles are formed in 2D space or a plurality of tetrahedra are formed in 3D space;(d) creating an aggregation map comprised of a list of certain ones of said plurality of triangles or certain ones of said plurality of tetrahedra which should be grouped together to form a polygonal shape, said certain ones of said plurality of triangles and said certain ones of said plurality of tetrahedra having nodes which are nearest neighbors of a structured distribution of points and having circumcenters which are clustered closely together;(e) grouping together inside said boundary said certain ones of said plurality of triangles or said certain ones of said plurality of tetrahedra in response to said aggregation map;(f) generating an unstructured grid in response to the grouping step comprised of a plurality of grid cells;(g) calculating cell property information for each of said plurality of grid cells; and(h) generating output data which includes said cell property information for said each of said plurality of grid cells, said output data being adapted for use by said simulator, said simulator generating a plurality of said simulation results associated, respectively, with said plurality of grid cells of said un-structured grid in response to said output data, a display displaying said plurality of grid cells and the respective plurality of simulation results.