Fracturing fluid treatment design to optimize fluid rheology...

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

E - Fixed Constructions

21

B

E21B 43/267 (2006.01) C09K 8/68 (2006.01)

Patent

CA 2182854

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 60-300°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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