US 11,959,020 B2
Acidizing retarder compositions and methods of reducing a rate of carbonate dissolution using the same
Jin Huang, Dhahran (SA); Wengang Li, Dhahran (SA); Bader Ghazi Al-Harbi, Dhahran (SA); and Ayman M. Almohsin, Kobar (SA)
Assigned to Saudi Arabian Oil Company, Dhahran (SA)
Filed by Saudi Arabian Oil Company, Dhahran (SA)
Filed on Dec. 30, 2021, as Appl. No. 17/565,587.
Prior Publication US 2023/0212452 A1, Jul. 6, 2023
Int. Cl. E21B 43/27 (2006.01); C09K 8/54 (2006.01); C09K 8/74 (2006.01); E21B 41/02 (2006.01)
CPC C09K 8/74 (2013.01) [C09K 8/54 (2013.01); E21B 41/02 (2013.01); E21B 43/27 (2020.05); C09K 2208/32 (2013.01)] 18 Claims
 
1. A method of reducing a rate of carbonate dissolution in a carbonate acidizing treatment of a carbonate formation, the method comprising:
dissolving one or more retarder compounds in a solution comprising acid to form an acidizing retarder composition, wherein the acid consists of strong mineral acid, wherein at least one of the one or more retarder compounds comprises a poloxamer, and wherein the acidizing retarder composition comprises from 0.5 weight percent to 5 weight percent of the one or more retarder compounds based on the total weight of the acidizing retarder composition; and
introducing the acidizing retarder composition to the carbonate formation, wherein the rate of carbonate dissolution in the presence of the acidizing retarder composition is reduced by an amount of from 50% to 95%, relative to a rate of carbonate dissolution in the absence of the acidizing retarder composition;
wherein the poloxamer comprises a compound of formula (I):

OG Complex Work Unit Chemistry
in which x and z are each independently an integer from 50 to 150; and
in which y is an integer from 20 to 80.