Ortho ester breakers for viscoelastic surfactant gels and...

Earth boring – well treating – and oil field chemistry – Well treating – Contains organic component

Reexamination Certificate

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C507S239000, C507S240000, C507S241000, C507S245000, C507S252000, C507S253000, C507S254000, C507S255000, C507S256000, C507S257000, C507S258000, C507S260000, C507S262000, C507S269000, C507S271000, C166S268000, C166S270100

Reexamination Certificate

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08008236

ABSTRACT:
Many methods are provided including a method comprising: providing a surfactant gel having a first viscosity that comprises an aqueous base fluid and a surfactant; providing an ortho ester breaker; contacting the surfactant gel with the ortho ester breaker; allowing the ortho ester breaker to hydrolyze to produce an acid and an alcohol; and allowing the acid and/or the alcohol to interact with the surfactant gel so as to reduce the first viscosity of the surfactant gel to a second viscosity. Other methods are provided that include a method comprising: providing a surfactant gel that comprises an aqueous base fluid and a surfactant having a first viscosity; placing the surfactant gel into a subterranean formation; providing an ortho ester breaker; contacting the breaker with the surfactant gel; allowing the breaker to hydrolyze to produce an acid and an alcohol; and allowing the acid and/or the alcohol to interact with the surfactant gel so as to reduce the first viscosity of the surfactant gel to a second viscosity.

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