Controlled degradation of polymer based aqueous gels

Details Controlled degradation of polymer based aqueous gels Controlled degradation of polymer based aqueous gels

1993-07-02

1995-09-05

Suchfield, George A.

Wells

Processes

Chemical inter-reaction of two or more introduced materials

166308, 507921, 507922, E21B 4326

Patent

active

054471990

ABSTRACT:
A method of fracturing a subterranean formation in a well bore is shown in which a gellable fracturing fluid is first formed by blending together an aqueous fluid, a hydratable polymer, a suitable crosslinking agent for crosslinking the hydratable polymer to form a polymer gel and a breaker comprising a slightly water soluble, organic peroxide. The crosslinked polymer gel is pumped into the well bore under sufficient pressure to fracture the surrounding formation. The breaker is allowed to degrade the crosslinked polymer with time to reduce the viscosity of the fluid so that the fluid can be pumped from the formation back to the well surface.

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patent: 4259205 (1981-03-01), Murphey
patent: 4324668 (1982-04-01), Harris
patent: 4368136 (1983-01-01), Murphey
patent: 4488975 (1984-12-01), Almond

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