Wells – Processes – Chemical inter-reaction of two or more introduced materials
Patent
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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Gupta D. V. Satyanarayana
Prasek Bethicia B.
Bielinski Peter A.
Suchfield George A.
The Western Company of North America
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