	US 11,851,613 B2
	Compositions and methods for controlled delivery of acid using sulfonate derivatives
Amy J. Cairns, Houston, TX (US); Katherine L. Hull, Houston, TX (US); and Desmond E. Schipper, Houston, TX (US)
Assigned to SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed by Saudi Arabian Oil Company, Dhahran (SA)
Filed on Aug. 5, 2021, as Appl. No. 17/394,490.
Claims priority of provisional application 63/061,845, filed on Aug. 6, 2020.
Prior Publication US 2022/0041921 A1, Feb. 10, 2022
Int. Cl. C09K 8/72 (2006.01); E21B 43/27 (2006.01)

CPC C09K 8/72 (2013.01) [E21B 43/27 (2020.05); C09K 2208/10 (2013.01)]

17 Claims

1. A method for in situ acid stimulation of a subterranean formation that contains a hydrocarbon reservoir, the method comprising:

contacting the subterranean formation with (a) a sulfonate-based ammonium salt capable of being oxidized to produce acid, and (b) an oxidizing agent capable of oxidizing the sulfonate-based ammonium salt, where the sulfonate-based ammonium salt and the oxidizing agent react to produce the acid; and

stimulating the subterranean formation with the produced acid.