Methods for performing reservoir simulation
US6662146B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 16, 1999 |
| Grant date | Dec 9, 2003 |
| Priority date | — |
| Expiry date | Nov 16, 2019 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B49/00
- WIPO fieldCivil engineering
- WIPO sectorOther fields
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.