Oil and gas field corrosion inhibitor compositions

Patent metadata

Field	Value
Publication number	US-12043794-B2
Application number	US-201917271116-A
Country	US
Kind code	B2
Filing date	Aug 27, 2019
Priority date	Aug 28, 2018
Publication date	Jul 23, 2024
Grant date	Jul 23, 2024

Abstract

A method of inhibiting corrosion of metal in contact with a corrosive mixture in an oil or gas field environment involving introducing a corrosion inhibitor composition into the corrosive mixture, the corrosion inhibitor composition including a nitrogen-containing compound having an alkyl amine group or an alkyl quaternary ammonium salt group, and at least one sulfur-containing compound selected from the group consisting of mercaptobenzothiazole, mercaptobenzoimidazole, a thioglycol compound, and a thiourea compound.

First claim

The invention claimed is:

1. A method of inhibiting corrosion of metal in contact with a corrosive mixture in an oil or gas field environment, the method comprising:
introducing a corrosion inhibitor composition into the corrosive mixture, wherein the corrosion inhibitor composition comprises:
a nitrogen-containing compound having an alkyl amine group or an alkyl quaternary ammonium salt group; and
at least one sulfur-containing compound selected from the group consisting of mercaptobenzothiazole and mercaptobenzoimidazole,
wherein the nitrogen-containing compound is at least one compound selected from the group consisting of an imidazoline compound, an alkyl amine, a quaternary ammonium salt, an alkoxylated amine, an alkyl polyamine, and an amine oxide,
wherein the corrosive mixture is a multi-phase mixture comprising brine and oil with a brine to oil ratio (w/o) of 5:95 to 95:5 by volume.

2. The method of claim 1 , wherein the nitrogen-containing compound is an imidazoline compound formed from a reaction between a fatty acid or an ester derivative thereof and an alkyl polyamine compound containing at least one ethylene diamine group.

3. The method of claim 2 , wherein the fatty acid is tall oil fatty acid, and wherein the alkyl polyamine compound is diethylenetriamine (DETA) or aminoethylethanolamine (AEEA).

4. The method of claim 1 , wherein the nitrogen-containing compound is an unsaturated fatty amine or a polyalkoxylated unsaturated fatty amine.

5. The method of claim 1 , wherein the nitrogen-containing compound has an iodine value above 120.

6. The method of claim 1 , wherein the sulfur-containing compound is 2-mercaptobenzothiazole.

7. The method of claim 1 , wherein a molar ratio (N:S) of the nitrogen-containing compound (N) to the sulfur-containing compound (S) is 2:1 to 5:1.

8. The method of claim 1 , wherein the corrosive mixture has a pH of 2 to 7.

9. The method of claim 1 , wherein the corrosive mixture comprises carbon dioxide, hydrogen sulfide, or both.

10. The method of claim 1 , wherein the metal in contact with the corrosive mixture is under a wall shear stress of 10 to 600 Pa.

11. The method of claim 1 , wherein the metal in contact with the corrosive mixture is under a wall shear stress of 150 to 250 Pa.

12. The method of claim 1 , wherein the corrosion inhibitor composition inhibits corrosion of the metal at a temperature of 20 to 90° C.

13. A corrosion inhibitor composition comprising:
a nitrogen-containing compound having an alkyl amine group or an alkyl quaternary ammonium salt group; and
at least one sulfur-containing compound selected from the group consisting of mercaptobenzothiazole and mercaptobenzoimidazole;
wherein a molar ratio (N:S) of the nitrogen-containing compound (N) to the sulfur-containing compound (S) is 1:1 to 10:1.

14. The corrosion inhibitor composition of claim 13 , wherein a molar ratio (N:S) of the nitrogen-containing compound (N) to the sulfur-containing compound (S) is 2:1 to 5:1.

15. The corrosion inhibitor composition of claim 13 , wherein the nitrogen-containing compound is at least one compound selected from the group consisting of an imidazoline compound, an alkyl amine, a quaternary ammonium salt, an alkoxylated amine, an alkyl polyamine, and an amine oxide.

16. The corrosion inhibitor composition of claim 13 , wherein:
the nitrogen-containing compound is an imidazoline compound formed from a reaction between a fatty acid or an ester derivative thereof and an alkyl polyamine compound containing at least one ethylene diamine group; and
the sulfur-containing compound is 2-mercaptobenzothiazole.

17. A corrosion inhibitor, comprising:
a nitrogen-containing compound having an alkyl amine group or an alkyl quaternary ammonium salt group;
at least one sulfur-containing compound selected from the group consisting of mercaptobenzothiazole and mercaptobenzoimidazole; and
an imidazoline compound with an iodine value above 120.

18. The corrosion inhibitor of claim 17 , wherein the imidazoline compound is formed from a reaction between a fatty acid or an ester derivative thereof and an alkyl polyamine compound containing at least one ethylene diamine group.

19. The corrosion inhibitor of claim 18 , wherein the fatty acid is tall oil fatty acid, and wherein the alkyl polyamine compound is diethylenetriamine (DETA) or aminoethylethanolamine (AEEA).

20. The method of claim 1 , wherein the corrosive mixture is a multi-phase mixture comprising brine and oil with a brine to oil ratio (w/o) of 20:80 to 90:10 by volume.

Assignees

• Kao Corp
• Chemeor Inc

Inventors

• Meng Fei
• Uno Mitsuru
• Tang Yongchun

Classifications

• C23F11/165

  Heterocyclic compounds containing sulfur as hetero atom · CPC title

• C23F11/149

  Heterocyclic compounds containing nitrogen as hetero atom · CPC title

• C23F11/141

  Amines; Quaternary ammonium compounds · CPC title

• C09K2208/32

  Anticorrosion additives · CPC title

• C09K15/26

  containing nitrogen and sulfur · CPC title