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Compositions for fracturing subterranean formations

  • US 5,869,435 A
  • Filed: 03/13/1995
  • Issued: 02/09/1999
  • Est. Priority Date: 03/10/1994
  • Status: Expired due to Fees
First Claim
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1. A hydraulic fracturing fluid useful for fracturing a subterranean formation which surrounds a well bore, said fracturing fluid comprising:

  • (a) an aqueous liquid;

    (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 which degrades said polysaccharide at a temperature above 195°

    F. and which is essentially incapable of degrading said polysaccharide at a temperature of 100°

    F. or less, wherein said enzyme breaker comprises, in combination, a mannanase which hydrolyzes β

    -1,4 hemicellulolytic linkages in galactomannans and an α

    -galactosidase which hydrolyzes α

    -1,6 hemicellulolytic linkages In galactomannans, said enzyme breaker Included in an amount effective to degrade said polysaccharide at said temperature.

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