Ramchandra Reddy

US Patent:

6915854, Jul 12, 2005

Filed:

Feb 10, 2004

Appl. No.:

10/775861

Inventors:

Kevin W. England - Houston TX, US
J. Ernest Brown - Katy TX, US
Jerald J. Hinkel - Houston TX, US
Ramchandra M. Reddy - Houston TX, US

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

C09K003/00
C09K007/02
E21B043/26
E21B043/263

US Classification:

166300, 1663082, 1663085, 1663086, 507202, 507244

Abstract:

A well treatment fluid composition that comprises a carrier fluid and an amphoteric surfactant, and optionally a viscosifying agent and proppant, is well suited for use in fracturing coal beds to stimulate methane production. The composition preferably is a foam that comprises a gas such as nitrogen or air. Preferably, the surfactant has the formulaR—NH—(CH)—C(O)OXwherein R is a saturated or unsaturated alkyl group having from 6-20 carbon atoms, n is from 2-6, and X is hydrogen or a salt forming cation.

US Patent:

20030207768, Nov 6, 2003

Filed:

Oct 2, 2001

Appl. No.:

09/969392

Inventors:

Kevin England - Houston TX, US
J. Brown - Katy TX, US
Jerald Hinkel - Houston TX, US
Ramchandra Reddy - Houston TX, US

International Classification:

E21B001/00

US Classification:

507/200000

Abstract:

A well treatment fluid composition that comprises a carrier fluid and an amphoteric surfactant, and optionally a viscosifying agent and proppant, is well suited for use in fracturing coal beds to stimulate methane production. The composition preferably is a foam that comprises a gas such as nitrogen or air. Preferably, the surfactant has the formula wherein R is a saturated or unsaturated alkyl group having from 6-20 carbon atoms, n is from 2-6, and X is hydrogen or a salt forming cation.