Enzyme breaker for galactomannan based fracturing fluid

Details Enzyme breaker for galactomannan based fracturing fluid Enzyme breaker for galactomannan based fracturing fluid

1992-02-26

1993-04-13

Suchfield, George A.

Wells

Processes

Chemical inter-reaction of two or more introduced materials

166308, 252 8551, E21B 4326

Patent

active

052013707

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 range from about 2.0 to 11.0 and is effective to attack only specific linkages in the cross-linked polymer gel.

REFERENCES:
patent: 2681704 (1954-06-01), Menaul
patent: 2801218 (1957-07-01), Menaul

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