Patent ID: 7928040

Claim:
A method for treating a portion of a wellbore or a portion of a subterranean formation, the method comprising the steps of: (A) forming or providing the composition, the composition comprising: (a) water; (b) a source of hydrogen peroxide, and (c) an activator selected from the group consisting of a chelated transition metal, a chelating agent and a transition metal, and any combination thereof in any proportion, wherein the chelating agent comprises EDTA, alkali or alkaline metal salt of EDTA, alkali metal citrate, citric acid, iminodiacetic acid, gluconate, NTA, tetraamidomacrocyclic ligand, or any combination thereof in any proportion; and wherein the pH of the composition is adjusted in the range of 3 to 10; (B) introducing the composition through a wellbore to treat a portion of a wellbore or a portion of a subterranean formation, wherein the portion of the wellbore or the portion of the subterranean formation is at a static temperature of less than 100° F. (38° C.); (C) after the step of introducing the composition, introducing a separate treatment fluid viscosified with xanthan through the wellbore to treat the portion of the wellbore or the portion of the subterranean formation; (D) after the step of introducing the separate treatment fluid, flowing back through the wellbore to cause the composition to flow back across the portion of the wellbore or the portion of the subterranean formation treated with the separate treatment fluid; (E) allowing the composition to contact the portion of the wellbore or the portion of the subterranean formation treated with the separate treatment fluid for a sufficient time at the static temperature thereof to substantially break the xanthan of the separate treatment fluid and/or filtercake formed by the separate treatment fluid; and (F) after the step of flowing back, further flowing back through the wellbore to recover at least some of the composition from the portion of the wellbore or the portion of the subterranean formation.