John David Wallis

Address:

14718 Kings Head Dr, Houston, TX 77044

VIN:

4T1BE46K67U058090

Make:

TOYOTA

Model:

CAMRY

Year:

2007

US Patent:

7516056, Apr 7, 2009

Filed:

Apr 25, 2006

Appl. No.:

11/410622

Inventors:

John Wallis - Houston TX, US
Hamdi A. Tchelepi - San Mateo CA, US
Hui Cao - Sugar Land TX, US

Assignee:

Schlumberger Technology Corporation - Houston TX

International Classification:

G06F 9/455

US Classification:

703 10, 702 11

Abstract:

A method, system and apparatus are disclosed for conducting a reservoir simulation, using a reservoir model of a gridded region of interest. The grid of the region of interest includes one or more types of cells, the type of cell being distinguished by the number of unknown variables representing properties of the cells. The cells share a common variable as an unknown variable. The method includes the steps of identifying different cell types for the grid; constructing an overall matrix for the reservoir model based on the different cell types; at least partially decoupling the common variable from the other unknown variables in the matrix by using a reduction process to yield a reduced matrix; mathematically breaking up the variables in the reduced matrix into k subsets by cell types; applying an overlapping multiplicative Schwartz procedure to the reduced matrix to obtain a preconditioner and using the preconditioner to solve for the unknown variables.

US Patent:

7684967, Mar 23, 2010

Filed:

Jun 14, 2006

Appl. No.:

11/453304

Inventors:

John Wallis - Sugar Land TX, US
Hamdi A. Tchelepi - San Mateo CA, US

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

G06G 7/48

US Classification:

703 10, 703 2, 345420, 345629

Abstract:

A method, system, a program storage device and apparatus are disclosed for conducting a reservoir simulation, using a reservoir model of a region of interest, wherein the region of interest has been gridded into cells. Each cell has one or more unknown variable. Each cell has a node. A graph of the nodes is represented by a sparse matrix. The graph is an initially decomposed into a pre-specified number of domains, such that each cell exists in at least one domain. The cells and domains are numbered. Each cell has a key, the key of each cell is the set of domain numbers to which the cell belongs. Each cell has a class, the class of each cell being the number of elements in the cell. The cells are grouped into connectors, each connector being the set of cells that share the same key. Each connector having a connector class, the connector class being the number of elements in the key of the connector. Each connector having only one higher-order neighbor connector is merged with such higher-order neighbor connector.

US Patent:

20120150506, Jun 14, 2012

Filed:

Dec 12, 2011

Appl. No.:

13/323060

Inventors:

Choongyong Han - Houston TX, US
John Wallis - Sugar Land TX, US
Pallav Sarma - San Ramon CA, US
Gary Li - Katy TX, US
Mark Schrader - The Woodlands TX, US
Wen Chen - Danville CA, US

Assignee:

Chevron U.S.A. Inc. - San Ramon CA

International Classification:

G06F 17/11
G06G 7/57
G06F 17/16

US Classification:

703 2

Abstract:

A method, system and computer program product is disclosed for using a constrained pressure residual (CPR) preconditioner to solve adjoint models. A linear system of fluid flow equations comprising a plurality of variables that represent fluid flow properties in a geological formation of a subterranean reservoir is provided. Matrix (Ã), which comprises a transpose of a Jacobian matrix associated with the linear system of fluid flow equations, is constructed. A constrained pressure residual preconditioner Mis constructed responsive to the matrix (Ã). Matrix equation (Ã)y=d is then solved using the constrained pressure residual preconditioner M.

US Patent:

20120221303, Aug 30, 2012

Filed:

Feb 24, 2012

Appl. No.:

13/404072

Inventors:

John R. Wallis - Sugar Land TX, US
Gary K. Li - Katy TX, US
Gareth Shaw - Sutton Courtenay, GB

Assignee:

Schlumberger Technology Corporation - Houston TX
Chevron U.S.A. Inc. - San Ramon CA

International Classification:

G06F 17/11
G06G 7/57
G06F 17/16

US Classification:

703 2

Abstract:

A computer-implemented system, method, and software are provided for solving linear systems of equations arising in reservoir simulation. A linear system of fluid flow equations, including a plurality of unknown variables, is provided that represents fluid flow properties in a geological formation of a subterranean reservoir. Block diagonal scaling is applied to the linear system of fluid flow equations. Threshold incomplete lower-upper approximate factorization is applied to obtain a preconditioning matrix, which can be used to iteratively solve unknown variables associated with the system of fluid flow equations. Preconditioning can be used directly as part of a preconditioned Krylov subspace method or alternatively as a 2stage preconditioner in a CPR algorithm.

US Patent:

62301012, May 8, 2001

Filed:

Jun 3, 1999

Appl. No.:

9/325170

Inventors:

John R. Wallis - Sugar Land TX

Assignee:

Schlumberger Technology Corporation - Houston TX

International Classification:

G06F 1717

US Classification:

702 16

Abstract:

A Linear Solver method and apparatus, embodied in a Simulator and adapted for solving systems of non-linear partial differential equations and systems of linear equations representing physical characteristics of an oil and/or gas reservoir, includes receiving a first signal representing physical characteristics of a reservoir, obtaining a residual vector r. sub. 0 from the first signal (representing errors associated with a system of nonlinear equations describing the reservoir) and a first matrix A. sub. 0 (representing the sensitivity of the residual vector to changes in a system of nonlinear equations), recursively decomposing matrix A. sub. 0 into a lower block triangular matrix, an upper block triangular matrix, and a diagonal matrix, and generating a second matrix M. sub. 0 that is an approximation to matrix A. sub. A solution to the systems of non-linear partial differential equations may then be found by using certain values that were used to produce the matrix M. sub.