Granted Patent B2

US 12,466,991 · App. 18/577,787 · Granted Nov 11, 2025

Inventors: Julia Fernandez del Valle (Doha, QA); Christopher Daeffler (Sugar Land, TX); Mohan Panga (Sugar Land, TX)

Assignee: Schlumberger Technology Corporation

C09K8/74C09K8/602E21B43/27

Abstract

Claims (19)

1 . A method of treating a subterranean formation, the method comprising:

preparing a single-phase aqueous mixture consisting of HCl, glycerol, and a betaine-based surfactant, wherein a concentration of the glycerol in the single-phase aqueous mixture is greater than a concentration of the betaine-based surfactant in the single-phase aqueous mixture, wherein the HCl and the glycerol react to form 3-chloropropane-1,2-diol, and wherein the 3-chloropropane-1,2-diol is configured to retard activity of the HCl; and

flowing the single-phase aqueous mixture into the subterranean formation.

2 . The method of claim 1 , wherein the betaine-based surfactant is a cationic surfactant.

3 . The method of claim 1 , further comprising adding to the single-phase aqueous mixture one or more components selected from the group consisting of corrosion inhibitors, friction reducers, scale inhibitors, biocides, surfactants, H 2 S scavengers, iron control reagents, diversion agents, viscosifiers, chelating reagents, solvents, clay stabilizers, and calcium inhibitors.

4 . The method of claim 1 , wherein the subterranean formation is a hydrocarbon reservoir having carbonate structures.

5 . The method of claim 1 , wherein the HCl is present in the single-phase aqueous mixture in stoichiometric excess.

6 . The method of claim 1 , further comprising adding to the single-phase aqueous mixture a catalytic amount of bromide or iodide.

7 . A single-phase acid treatment composition consisting of HCl, glycerol, and a betaine-based surfactant, wherein a concentration of the glycerol in the single-phase acid treatment composition is greater than a concentration of the betaine-based surfactant in the single phase acid treatment composition, wherein the HCl and the glycerol react to form 3-chloropropane-1,2-diol, wherein the 3-chloropropane-1,2-diol is configured to retard activity of the HCl, and wherein the single-phase acid treatment composition is disposed in a subterranean formation.

8 . The single-phase acid treatment composition of claim 7 , wherein the betaine-based surfactant is a cationic surfactant.

9 . The single-phase acid treatment composition of claim 7 , wherein the HCl is present in stoichiometric excess.

10 . The single-phase acid treatment composition of claim 7 , wherein the surfactant is erucic amidopropyl dimethyl betaine.

11 . A method of treating a hydrocarbon reservoir, the method comprising:

obtaining a single-phase aqueous mixture consisting of HCl, glycerol, and a betaine-based surfactant, wherein a concentration of the glycerol in the single-phase aqueous mixture is greater than a concentration of the betaine-based surfactant in the single-phase aqueous mixture, wherein the HCl and the glycerol react to form 3-chloropropane-1,2-diol, and wherein the 3-chloropropane-1,2-diol is configured to retard activity of the HCl; and

flowing the single-phase aqueous mixture into the hydrocarbon reservoir.

12 . The method of claim 11 , wherein the HCl is present in stoichiometric excess.

13 . The method of claim 11 , wherein the hydrocarbon reservoir comprises a carbonate formation.

14 . The method of claim 11 , wherein the single-phase aqueous mixture further consists of a catalytic amount of bromide or iodide.

15 . The single-phase acid treatment composition of claim 7 , wherein the concentration of the betaine-based surfactant in the single phase acid treatment composition is less than a concentration of the HCl in the single phase acid treatment composition.

Assignments (2)

Continuity (3)

References Cited (204)