FIELD: chemistry.
SUBSTANCE: invention is related to a method of fracturing a subterranean formation at downhole temperatures exceeding 160°F, comprising introducing into the formation an aqueous gellable fracturing fluid of pH between 9.5 and 11, comprising a hydratable polymer selected from the group consisting of guars and derivatised guars; a crosslinking agent for crosslinking the hydratable polymer to form a polymer gel; and an enzyme breaker comprising the mannanohydrolase enzyme, wherein the enzyme breaker is coded by the nucleotide sequence which is at least 90% homologous with the nucleotide sequence of SEQ ID NO:2.
EFFECT: downhole fracturing operations may be conducted at the temperatures in excess of 160°F.
19 cl, 7 ex, 8 dwg
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