The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 09, 2003
Filed:
Nov. 16, 1999
James W. Watts, Houston, TX (US);
Landmark Graphics Corporation, Houston, TX (US);
Abstract
A method for performing reservoir simulation by solving a mixed implicit-IMPES matrix (MIIM) equation. A variable implicit reservoir model comprises implicit cells and IMPES cells. The MIIM equation includes a first scalar IMPES equation for each IMPES cell and a set of implicit equations for each implicit cell. The simulation method comprises: (a) constructing a global IMPES pressure equation; (b) solving the global IMPES pressure equation for pressure changes; (c) computing first residuals at the implicit cells; (d) determining improved saturations by solving the total velocity sequential equations at the implicit cells; (e) computing second residuals at the implicit cells and at IMPES cells in flow communication with the implicit cells. Steps (b) through (e) are repeated until a convergence condition is satisfied. Alternative to step (d), improved saturations and improved pressures may be computed by performing one or more iterations with a selected preconditioner at the implicit cells.