Controlled degradation of polysaccharides

Details Controlled degradation of polysaccharides Controlled degradation of polysaccharides

1992-07-29

1997-04-29

Geist, Gary

Earth boring, well treating, and oil field chemistry

Well treating

Contains organic component

507921, 507241, 507237, 507238, 507273, 507269, E21B 4327

Patent

active

056248865

ABSTRACT:
A method is shown for fracturing a subterranean formation in which a hydratable polymer, crosslinking agent and breaker are combined in an aqueous carrier to form a gelled fracturing fluid. The breaker is comprised of a substantially insoluble oxidant which is granulated and formed into a pellet or prill with a suitable binder. The pellet so formed can also contain a chelating agent and an activator in order to enhance the rate of breaking. The substantially insoluble oxidant is selected from the group consisting of alkaline earth and zinc salts of peroxide, perphosphate, perborate, and percarbonate.

REFERENCES:
patent: 4202795 (1980-05-01), Burnham et al.
patent: 4506734 (1985-03-01), Nolte
patent: 4604218 (1986-08-01), Dawson
patent: 4741401 (1988-05-01), Walles et al.

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