COMPOSITIONS AND METHODS FOR CONTROLLED DELIVERY OF ACID USING SULFONATE DERIVATIVES
The present application relates to compositions and methods for controlled delivery of acid to a desired location, for instance to a subterranean formation.
1 - 29 . (canceled)
30 . An aqueous fluid for in situ acid stimulation of a subterranean formation that contains a hydrocarbon reservoir, where the aqueous fluid comprises:
(a) a sulfonate-based 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 in the aqueous fluid react to produce acid.
31 - 46 . (canceled)
47 . The aqueous fluid of claim 30 , where the sulfonate-based ammonium salt comprises a salt selected from the group consisting of ammonium methanesulfonate, ammonium perfluorobutanesulfonate, ammonium trifluoromethanesulfonate, and mixtures thereof.
48 . The aqueous fluid of claim 30 , comprising the sulfonate-based ammonium salt at a concentration in the range of 0.001 M up to saturation.
49 . The aqueous fluid of claim 30 , where the oxidizing agent comprises an agent selected from the group consisting of a peroxide, a persulfate salt, a permanganate salt, a bromate salt, a perbromate salt, a chlorate salt, a perchlorate salt, an iodate salt, a periodate salt, and mixtures thereof.
50 . The aqueous fluid of claim 30 , comprising the oxidizing agent at a concentration in the range of 0.001 M up to saturation.
51 . The aqueous fluid of claim 30 , where the oxidizing agent comprises sodium bromate.
52 . The aqueous fluid of claim 30 , where the sulfonate-based ammonium salt is tethered to a nanoparticle to form a sulfonate based-ammonium salt-nanoparticle.
53 . The aqueous fluid of claim 52 , where the sulfonate-based ammonium salt is tethered to the nanoparticle through one or more metal salts.
54 . The aqueous fluid of claim 52 , where the sulfonate-based ammonium salt-nanoparticle is represented by formula I:
[NP][(M) p -(B) n —S(O) 2 O − ·NH 4 + ]
wherein [NP] is a suitable nanoparticle, M is a metal salt, B is a multifunctional repeating unit selected from aliphatic, heteroaliphatic, and aryl, p is 0 or 1, and n is 0 to 20.
55 . The aqueous fluid of claim 54 , where [NP] comprises a metal oxide nanoparticle of formula M x O y , wherein x is selected from 1 to 3 and y is selected from 1 to 5.
56 . The aqueous fluid of claim 53 , where the one or more metal salts are selected from the group consisting of silicon, cerium, zirconium iron, cobalt, manganese, zinc, gadolinium, nickel, and combinations thereof.
57 . The aqueous fluid of claim 54 , where B is a multifunctional C 1-12 aliphatic, wherein a C 1-12 aliphatic group is selected from C 1-12 alkyl, C 2-12 alkenyl, C 2-12 alkynyl, and combinations thereof.
58 . The aqueous fluid of claim 30 , where the sulfonate-based ammonium salt and the oxidizing agent react at a temperature in a range of 65° C. to 200° C. to produce acid.
59 . The aqueous fluid of claim 30 , where the sulfonate-based ammonium salt and the oxidizing agent react at a temperature in a range of 65° C. to 120° C. to produce acid.
60 . The aqueous fluid of claim 30 , where the sulfonate-based ammonium salt and the oxidizing agent react at a temperature in a range of 100° C. to 200° C. to produce acid.
61 . The aqueous fluid of claim 30 , where the sulfonate-based ammonium salt and the oxidizing agent react at a temperature of less than 65° C. at a pH that is greater than 5 to produce acid.
62 . The aqueous fluid of claim 30 , where the sulfonate-based ammonium salt and the oxidizing agent react at a temperature of 65° C. or greater to produce acid.
63 . The aqueous fluid of claim 30 , where the produced acid is configured to stimulate the subterranean formation.