Patent ID: 8584757

Claim:
A method of producing a treated aqueous-based fluid to be utilized in a wellbore or surrounding subterranean formation, comprising the step of: contacting an aqueous-based fluid with an aqueous-soluble breaker composition comprising an oxidizing agent and a catalyst for a time sufficient to reduce or eliminate one or more deleterious substances in the aqueous-based fluid to produce a treated aqueous-based fluid suitable for use in a wellbore or surrounding subterranean formation, wherein the catalyst has the structure of formula (I) or formula (II): wherein Y 1 , Y 3 and Y 4 each independently represent a bridging group having zero, one, two or three carbon containing nodes for substitution, and each Y 2 independently represents a bridging group having at least one carbon containing node for substitution, each said node containing a C(R), or a C(R) 2 unit and each R substituent is the same or different from the remaining R substituents and (i) is selected from the group consisting of alkyl, alkenyl, cycloalkyl, cycloalkenyl, aryl, alkynyl, alkylaryl, halogen, alkoxy, phenoxy, CH 2 CF 3 , CF 3 and combinations thereof, (ii) form a substituted or unsubstituted benzene ring of which two carbon atoms in the ring form nodes in the Y unit, or (iii) together with a paired R substituent bound to the same carbon atom form a cycloalkyl or cycloalkenyl ring, which optionally include an atom other than carbon; M is a transition metal with oxidation states of I, II, III, IV, V, VI, VII or VIII or selected from Groups 3, 4, 5, 6, 7, 8, 9, 10, 11 and 12 of the Periodic Table of the Elements; Q is any counterion which would balance the charge of the compound on a stoichiometric basis; and L is any labile ligand; merging the treated aqueous-based fluid with a second aqueous-based fluid prior to use in a wellbore or surrounding subterranean formation.