Fracturing fluid treatment design to optimize fluid rheology and

Details Fracturing fluid treatment design to optimize fluid rheology and Fracturing fluid treatment design to optimize fluid rheology and

1995-10-18

1996-10-08

Suchfield, George A.

Wells

Processes

With indicating, testing, measuring or locating

166280, 166300, 166308, E21B 4900, E21B 43267

Patent

active

055621600

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 cross-linking agent for cross-linking the hydratable polymer to form a polymer gel and an enzyme breaker. The cross-linked polymer gel is pumped into the well bore under sufficient pressure to fracture the surrounding formation. The enzyme breaker is allowed to degrade the cross-linked 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. The particular enzyme breaker utilized has an activity in the temperature range from about 60.degree.-300.degree. F. and at a pH range from about 2.0 to 11.0 and is effective to attack only specific linkages in the cross-linked polymer gel.

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