	US 11,788,397 B2
	Retarded acid system based on sulfonyl chloride and methods thereof
Mohammed AlKhaldi, Dhahran (SA); Abdullah Almoajil, Dhahran (SA); and Abdulaziz AlGhamdi, Dhahran (SA)
Assigned to SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed by SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed on May 7, 2021, as Appl. No. 17/314,761.
Prior Publication US 2022/0356795 A1, Nov. 10, 2022
Int. Cl. E21B 43/27 (2006.01); C09K 8/72 (2006.01)

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

18 Claims

1. An acidizing fluid, comprising:

an aqueous fluid;

a sulfonyl chloride; and

a mutual solvent,

wherein the aqueous fluid; sulfonyl chloride; and mutual solvent are present at a ratio to form a single miscible phase.

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

contacting the formation with an acidizing fluid comprising an aqueous fluid, a sulfonyl chloride, and a mutual solvent,

wherein upon exposure to formation temperatures, the sulfonyl chloride and aqueous fluid hydrolyze the sulfonyl chloride, thereby producing hydrochloric acid, and

wherein the aqueous fluid, sulfonyl chloride, and mutual solvent are present at a ratio to form a single miscible phase.