Wells – Processes – Chemical inter-reaction of two or more introduced materials
Patent
1994-03-10
1995-06-06
Suchfield, George A.
Wells
Processes
Chemical inter-reaction of two or more introduced materials
166308, 507201, 507211, 507921, 507922, E21B 43267
Patent
active
054214122
ABSTRACT:
A method of fracturing a subterranean formation which surrounds a well bore comprises the steps of providing a fracturing fluid, and injecting the fracturing fluid into the well bore at a pressure sufficient to form fractures in the subterranean formation which surrounds the well bore. The pressure is then released from the fracturing fluid, after which the fluid may be removed from the well and the well placed into production. The fracturing fluid comprises an aqueous liquid, a polysaccharide soluble or dispersible in the aqueous liquid in an amount sufficient to increase the viscosity of the aqueous liquid, an enzyme breaker which degrades said polysaccharide at a temperature above 180.degree. F. Fracturing fluid compositions and enzyme breaker systems useful for carrying out the invention are also disclosed.
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E. Luthi et al; Cloning, Sequence Analysis, and Expression in Escherichia coli of a Gene Coding for a .beta.-Mannanase from the Extremely Thermophilic Bacterium "Caldocellum saccharolyticum" Applied and Environmental Microbiology pp. 694-700 (1991).
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Kelly Robert M.
Khan Saad A.
Leduc Pascal
Prud'homme Robert K.
Tayal Akash
North Carolina State University
Suchfield George A.
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