Patent ID: 6197730
Filing Date: 2001-03-06
Classification: C09K,E21B,Y10S

Abstract:
A hydraulic fracturing fluid useful for fracturing a subterranean formation that surrounds a well bore, said fracturing fluid comprising:(a) an aqueous liquid; and(b) a polysaccharide soluble or dispersible in said aqueous liquid in an amount sufficient to increase the viscosity of said aqueous liquid; and(c) an enzyme breaker that degrades said polysaccharide at a temperature above 180.degree. F. and that is essentially incapable of degrading said polysaccharide at a temperature of 100.degree. F. or less, wherein said enzyme breaker comprises a mannanase that degrades said polysaccharide, said enzyme breaker included in an amount effective to degrade said polysaccharide at said temperature.