Compositions and methods for controlled delivery of acid
AssigneeSaudi Arabian Oil Company
InventorsAmy J. Cairns, Katherine L. Hull, Mohammed Sayed
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Abstract
Compositions and methods for the controlled delivery of acid to a desired location. In some embodiments, methods for in situ acid stimulation of a subterranean formation that contains a hydrocarbon reservoir comprise contacting the formation with an aqueous fluid that comprises (a) an ammonium salt capable of being oxidized to produce acid and (b) an oxidizing agent capable of oxidizing the ammonium salt, where the ammonium salt and oxidizing agent react to produce an acid.
Claims27
A method for in situ acid stimulation of a subterranean formation that contains a hydrocarbon reservoir, the method comprising contacting the subterranean formation with an aqueous fluid that comprises (a) an ammonium salt capable of being oxidized to produce an acid;
- and (b) an oxidizing agent capable of oxidizing the ammonium salt, where the ammonium salt and the oxidizing agent form an acid when reacted at a temperature of 65° C. or greater to produce the acid.
An aqueous fluid for in situ acid stimulation of a subterranean formation that contains a hydrocarbon reservoir, where the aqueous fluid comprises (a) an ammonium salt capable of being oxidized to produce an acid;
- and (b) an oxidizing agent capable of oxidizing the ammonium salt, where the ammonium salt and the oxidizing agent form an acid when reacted at a temperature of 65° C. or greater to produce the acid.
A method for in situ acid treatment of a subterranean formation selected from a water injection well, a gas injection well, a water disposal well, and a drill cuttings disposal well, the method comprising contacting the formation with an aqueous fluid that comprises (a) an ammonium salt capable of being oxidized to produce an acid;
- and (b) an oxidizing agent capable of oxidizing the ammonium salt, where the ammonium salt and the oxidizing agent form an acid when reacted at a temperature of 65° C. or greater to produce the acid.
An aqueous fluid for in situ acid treatment of a subterranean formation selected from a water injection well, a gas injection well, a water disposal well, and a drill cuttings disposal well, where the aqueous fluid comprises (a) an ammonium salt capable of being oxidized to produce an acid;
- and (b) an oxidizing agent capable of oxidizing the ammonium salt, where the ammonium salt and the oxidizing agent form an acid when reacted at a temperature of 65° C. or greater to produce the acid.
Dependencies are inferred from the claim text.