Patent ID: 7195071

Claim:
A method of maintaining the integrity of a filter cake while reducing the viscosity of a viscosified treatment fluid comprising succinoglycan comprising: providing a viscosified treatment fluid comprising succinoglycan, and an enzyme composition selected from the group consisting of beta-1,4 glucanases, beta-1,3 glucanases, beta-1,3;1,4 glucanases, beta-1,6 glucanases, and combinations thereof; providing a wellbore penetrating a subterranean formation wherein a filter cake that does not comprise succinoglycan is present in at least a portion of the wellbore; placing the viscosified treatment fluid into the wellbore; and allowing the enzyme composition to react with the succinoglycan in the viscosified treatment fluid so as to reduce the viscosity of the viscosified treatment fluid but not degrade the filter cake.