Carolyn S Devine

US Patent:

20050137095, Jun 23, 2005

Filed:

Dec 15, 2004

Appl. No.:

11/012572

Inventors:

Kay Cawiezel - Fulshear TX, US
Carolyn Devine - Spring TX, US

Assignee:

BJ Services Company - Houston TX

International Classification:

E21B043/00

US Classification:

507240000

Abstract:

A method of acidizing a subterranean formation involves the use of a composition containing a solution of a viscoelastic amidoamine oxide surfactant and an HF-containing acidizing solution. The composition typically contains from about 0.1 to about 8 weight percent of surfactant solution and from about 92 to about 99.9 weight percent of HF-containing acidizing solution. The composition is pumped into the subterranean formation. As the acid reacts, the composition viscosifies and becomes a self-diverting agent created in-situ. When the acid is further spent, the fluid viscosity declines eventually returning to a low viscosity state, allowing for easy cleanup. The process allows for selective acidizing of less permeable zones of the formation and more uniform stimulation of the hydrocarbon bearing formulation.

US Patent:

20070062273, Mar 22, 2007

Filed:

Sep 13, 2006

Appl. No.:

11/520549

Inventors:

Leonard Kalfayan - Houston TX, US
William Wood - Spring TX, US
Jennifer Cutler - Tomball TX, US
Carolyn DeVine - Spring TX, US

International Classification:

G01N 15/08
E21B 47/10

US Classification:

073152180, 073038000

Abstract:

A fluid flow model is comprised of one cross-flow style core holder and a multitude of standard style core holders, all connected by a concurrent combination of serial and parallel flow paths. The sum of these flow paths yields a fluid flow model that closely approximates a small radial slice of a conventional reservoir. The fluid flow model has particular applicability to estimate the requisite treatment fluid for use in acidizing as well as water control methods.