Method for fracturing subterranean formations using controlled r

Details Method for fracturing subterranean formations using controlled r Method for fracturing subterranean formations using controlled r

1994-08-24

1995-08-01

Suchfield, George A.

Wells

Processes

Chemical inter-reaction of two or more introduced materials

166308, 507902, 507921, E21B 4326

Patent

active

054373310

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 encapsulated enzyme breaker. The cross-linked polymer gel is pumped into the well bore under sufficient pressure to fracture the surrounding formation. The encapsulated 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 uses open cellular encapsulation to protect and delay the action of the enzyme.

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1992 SPE Permian Basin Oil and Gas Recovery Conference held in Midland, Tex. Mar. 18-20. "High-pH-Tolerant Enzyme Breaker for Oilfield Applications".
Publication Strata Views-Jul. 1993 "History of the Development of Fracturing Fluid Breakers".

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