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US 2012/0111568 A1Published application
COMPOSITIONS USEFUL FOR THE HYDROLYSIS OF GUAR IN HIGH pH ENVIRONMENTS AND METHODS RELATED THERETO
AssigneeBaker Hughes Incorporated
InventorCharles David Armstrong
Life of this patent
Estimating the term…
Abstract
Methods and compositions of fracturing formations are provided. The fracturing fluid includes an enzyme breaker that decreases the viscosity of the fracturing fluid over time. The enzyme breaker can be used in environments having a pH value ranging from about 7 to about 12.
Claims22
A method of fracturing a subterranean formation that surrounds a well bore, the method comprising the steps of:
- a) combining an aqueous fluid, a hydratable polymer, a crosslinking agent, and an alkaliphile derived enzyme breaker selected from the group consisting of glycoside hydrolase family 5, glycoside hydrolase family 26 and mixtures thereof to produce a crosslinked polymer fluid;
- b) injecting the crosslinked polymer gel into the well bore and into contact with the formation under sufficient pressure to fracture the surrounding subterranean formation;
- and
- c) allowing the enzyme breaker to degrade the crosslinked polymer gel so that it can be removed from the subterranean formation, the enzyme breaker being catalytically active and temperature stable in a temperature range of about 60° F. to about 225° F. and in a pH range of about 7 to about 12.
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A method of fracturing a subterranean formation penetrated by a well bore, the method comprising the steps of:
- a) providing a crosslinked polymer gel comprising an aqueous fluid, a hydratable polymer, a crosslinking agent capable of crosslinking the hydratable polymer, and an enzyme breaker comprising an alkaliphile derived enzyme breaker selected from the group consisting of glycoside hydrolase family 5, glycoside hydrolase family 26 and mixtures thereof to produce a crosslinked polymer fluid;
- b) injecting the crosslinked polymer gel into the well bore and into contact with the formation under sufficient pressure to fracture the surrounding subterranean formation;
- and
- c) allowing the enzyme breaker to degrade the crosslinked polymer gel so that it can be removed from the subterranean formation, the enzyme breaker being catalytically active and temperature stable in a temperature range of about 60° F. to about 225° F.
1 more element
A fracturing fluid composition comprising:
- a) an aqueous fluid;
- b) a hydratable polymer;
- c) a crosslinking agent capable of crosslinking the hydratable polymer;
- and
- d) an enzyme breaker comprising an alkaliphile derived enzyme breaker selected from the group consisting of glycoside hydrolase family 5, glycoside hydrolase family 26 and mixtures thereof to produce a crosslinked polymer fluid, the enzyme breaker being catalytically active and temperature stable in a temperature range of about 60° F. to about 225° F. and in a pH range of about 7 to about 12.
2 more elements
Dependencies are inferred from the claim text.