US 12,404,447 B2
Single-phase retarded acid systems using amino acids
Haiyan Zhao, Sugar Land, TX (US); Murtaza Ziauddin, Katy, TX (US); Philippe Enkababian, Abu Dhabi (AE); Temiloluwa Yusuf, Sugar Land, TX (US); and Patrice Abivin, Houston, TX (US)
Assigned to Schlumberger Technology Corporation, Sugar Land, TX (US)
Appl. No. 18/691,989
Filed by Schlumberger Technology Corporation, Sugar Land, TX (US)
PCT Filed Nov. 30, 2022, PCT No. PCT/US2022/051322
§ 371(c)(1), (2) Date Mar. 14, 2024,
PCT Pub. No. WO2023/102001, PCT Pub. Date Jun. 8, 2023.
Claims priority of provisional application 63/284,547, filed on Nov. 30, 2021.
Prior Publication US 2024/0360356 A1, Oct. 31, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. C09K 8/74 (2006.01)
CPC C09K 8/74 (2013.01) [C09K 2208/30 (2013.01)] 20 Claims
 
1. A single-phase aqueous fluid, comprising:
water;
one or more strong acid molecules, wherein the one or more strong acid molecules are present at a concentration in a range of 15 wt % to 28 wt %, based on the weight of the single-phase aqueous fluid;
an amino acid component comprising lysine, wherein the amino acid component is present in a molar ratio of the amino acid component to the one or more strong acid molecules that is from 1:15 to 1:40; and
an acid retarding agent comprising a viscoelastic surfactant, wherein the acid retarding agent is present at a concentration in a range of 0.2 wt % to 1.5 wt %, based on the weight of the single-phase aqueous fluid.