Earth boring – well treating – and oil field chemistry – Well treating – Contains organic component
Reexamination Certificate
2006-05-16
2009-10-06
Seidleck, James (Department: 1796)
Earth boring, well treating, and oil field chemistry
Well treating
Contains organic component
C507S261000, C507S267000, C507S269000, C507S272000, C166S311000
Reexamination Certificate
active
07598208
ABSTRACT:
The present invention relates to methods and compositions for degrading filter cakes in subterranean formations, and more specifically, to improved methods and compositions for degrading filter cakes that comprise acid-soluble portions and polymeric portions. In one embodiment, the present invention provides a method of degrading a filter cake comprising an acid-soluble portion and a polymeric portion in a subterranean formation comprising the steps of: introducing a filter cake degradation composition comprising a delayed-release acid component and a delayed-release oxidizer component to a well bore penetrating the subterranean formation; allowing the delayed-release acid component to release an acid derivative and the delayed-release oxidizer component to release an acid-consuming component; allowing the acid-consuming component to interact with the acid derivative to delay a reaction between at least a portion of the acid derivative and at least a portion of the acid-soluble portion of the filter cake and to produce hydrogen peroxide; allowing the acid derivative to degrade at least a portion of the acid-soluble portion of the filter cake after a delay period; and allowing the hydrogen peroxide to degrade at least a portion of the polymeric portion of the filter cake.
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Baker & Botts L.L.P.
Figueroa John J
Halliburton Energy Service,s Inc.
Kent Robert A.
Seidleck James
LandOfFree
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