Patent ID: 11952533
Assignee: HALLIBURTON ENERGY SERVICES, INC.
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 12:
13. A method of breaking a filtercake disposed on a wall of a wellbore penetrating a subterranean formation, comprising:
contacting the filtercake with a breaker comprising (a) an acid precursor; (b) a brine; and (c) an accelerating agent at a downhole temperature of from 15° C. to about 100° C. wherein the accelerating agent is selected from the group consisting of ZnSO4 and hydrates thereof; wherein addition of the accelerating agent changes a pH of the breaker by equal to or less than about 10% when compared to the pH change observed with the acid precursor and brine alone and wherein a rate of acid precursor hydrolysis is increased by from about 5 times to about 30 times the rate of acid precursor hydrolysis observed in the absence of an accelerating agent.