	US 11,912,936 B2
	Aqueous modified acid compositions and methods of using the same
Clay Purdy, Medicine Hat (CA); Markus Weissenberger, Calgary (CA); and Cora Gordos, Calgary (CA)
Assigned to Dorf Ketal Chemicals FZE
Filed by FLUID ENERGY GROUP LTD., Calgary (CA)
Filed on Dec. 18, 2020, as Appl. No. 17/126,729.
Claims priority of application No. CA 3065704 (CA), filed on Dec. 20, 2019.
Prior Publication US 2021/0189226 A1, Jun. 24, 2021
Int. Cl. C09K 8/74 (2006.01); E21B 43/26 (2006.01); C09K 8/528 (2006.01)

CPC C09K 8/74 (2013.01) [C09K 8/528 (2013.01); E21B 43/26 (2013.01); C09K 2208/32 (2013.01)]

20 Claims

1. An aqueous modified acid composition comprising:

an acid;

a first component comprising an amino acid having a single carboxylic acid group, the amino acid selected from the group consisting of lysine, glycine, alanine, methionine, histidine, arginine, serine, proline, cysteine, threonine, and selenocysteine;

a second component having a structure comprising an amine group and a sulfonic acid group;

wherein said first component and said acid are present in a molar ratio ranging from 1:3 to 1:12.5, and

wherein the aqueous modified acid composition acidizes or stimulates hydrocarbon-containing dolomite formations and hydrocarbon-containing limestone formations to create wormholes therein.