US 12,473,486 B2
Single-phase retarded acid based on a cationic surfactant
Samuel Danican, Sugar Land, TX (US); Haiyan Zhao, Sugar Land, TX (US); and Patrice Abivin, Houston, TX (US)
Assigned to Schlumberger Technology Corporation, Sugar Land, TX (US)
Appl. No. 18/723,901
Filed by Schlumberger Technology Corporation, Sugar Land, TX (US)
PCT Filed Mar. 23, 2023, PCT No. PCT/US2023/016032
§ 371(c)(1), (2) Date Jun. 25, 2024,
PCT Pub. No. WO2023/183465, PCT Pub. Date Sep. 28, 2023.
Claims priority of provisional application 63/269,813, filed on Mar. 23, 2022.
Prior Publication US 2025/0075123 A1, Mar. 6, 2025
Int. Cl. C09K 8/76 (2006.01)
CPC C09K 8/76 (2013.01) [C09K 2208/28 (2013.01); C09K 2208/32 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method, comprising:
preparing a composition comprising water, an acid and an acid retarding agent comprising an alkyl dimethyl benzyl ammonium chloride, wherein the acid is present at a concentration between 7.5 wt % and 36 wt %, wherein the alkyl dimethyl benzyl ammonium chloride is present at a concentration between 0.1 wt % and 5.0 wt %, and wherein the alkyl dimethyl benzyl ammonium chloride comprises about 14% C12, about 58% C14, and about 28% C16; and
injecting the composition into a wellbore penetrating a carbonate subterranean formation, wherein the temperature of the carbonate subterranean formation is greater than or equal to 160° F.