AQUEOUS RETARDED ACID SOLUTION AND METHODS FOR USE THEREOF

摘要

Methods include combining an amount of water and an acid retarding agent (RA), where the amount of water is present in an amount up to about 5 times the mass of the RA, inclusive, and wherein the RA includes at least one salt compound. An amount of acid is dissolved in the combined amount of water and RA to form a composition, where the amount of acid is a molar ratio of acid:RA of between 4.0 and 0.2, inclusive, and wherein the amount of acid is up to about 36% by weight of total weight of the composition. The composition is injected into a wellbore penetrating a subterranean formation at a pressure, which may be less than the fracture initiation pressure of the subterranean formation in some cases, while in other cases equal to or greater than the fracture initiation pressure.

主权项

1. A method, comprising:
combining an amount of water and an acid retarding agent (RA), wherein the amount of water is present in an amount up to about 5 times the mass of the RA, inclusive, and wherein the RA comprises at least one salt compound; dissolving an amount of acid in the combined amount of water and acid retarding agent to form a composition, wherein the amount of acid comprises a molar ratio of acid:acid retarding agent of between 4.0 and 0.2, inclusive, and wherein the amount of acid comprises up to about 36% by weight of total weight of the composition; and injecting the composition into a wellbore penetrating a subterranean formation at a pressure less than the fracture initiation pressure of the subterranean formation.