Methods for effecting controlled break in pH dependent...

Details Methods for effecting controlled break in pH dependent... Methods for effecting controlled break in pH dependent...

2007-11-27

2007-11-27

Gay, Jennifer H. (Department: 3676)

Wells

Processes

Placing fluid into the formation

C166S308200

Reexamination Certificate

active

11199921

ABSTRACT:
The invention provides a fluid for use in a subterranean formation penetrated by a wellbore, the fluid comprising: (a) water; (b) an orthoester; and (c) a surfactant comprising a tertiary alkyl amine ethoxylate generally represented by the following formula:wherein R is an alkyl group or aryl group, and wherein X and Y are each independently at least one. The invention also provides a method of fracturing a subterranean formation, comprising the step of forming a foamed fracturing fluid comprising water; an orthoester; a surfactant comprising a tertiary alkyl amine ethoxylate generally represented by the formula above; and a gas. The method also provides the step of introducing the foamed fracturing fluid into a subterranean formation at a pressure sufficient to create a fracture in the subterranean formation.

REFERENCES:
patent: 6454008 (2002-09-01), Chatterji et al.
patent: 6858743 (2005-02-01), Stanek et al.
patent: 6966379 (2005-11-01), Chatterji et al.
patent: 7140438 (2006-11-01), Frost et al.
patent: 2004/0200616 (2004-10-01), Chatterji et al.
patent: 2005/0043188 (2005-02-01), Chatterji et al.
patent: 2005/0077047 (2005-04-01), Chatterji et al.

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