Synergistic corrosion inhibitor blends

Patent metadata

Field	Value
Publication number	US-2025034447-A1
Application number	US-202418913713-A
Country	US
Kind code	A1
Filing date	Oct 11, 2024
Priority date	Mar 17, 2022
Publication date	Jan 30, 2025
Grant date	—

Abstract

A method for inhibiting corrosion of metal surfaces, such as carbon steel tubing, that are in contact with a fluid, such as brine in an oil and gas production fluid containing acid gases (e.g., CO2 and H2S) is accomplished by introducing a corrosion-inhibiting blend of two components into the fluid, where blend is glycolipids and quaternized amines, glycolipids and phosphate-containing compounds, quaternized amines and imidazoline-like compounds, quaternized amines and phosphate-containing compounds, or combinations of these blends. Each of the two components of the blends are present in an amount effective to synergistically inhibiting the corrosion of the metal surface when used together.

First claim

It is claimed:

1 . A synergistic corrosion inhibitor comprising a blend selected from the group consisting of:
at least one glycolipid and at least one phosphate-containing compound; at least one quaternized amine and at least one imidazoline-like compound; at least one quaternized amine and at least one phosphate-containing compound; and combinations of these blends.

2 . The synergistic corrosion inhibitor of claim 1 , wherein the at least one glycolipid is selected from the group consisting of sophorolipids and rhamnolipids.

3 . The synergistic corrosion inhibitor of claim 1 , wherein the at least one quaternized amine comprises ester and alkoxy functional groups.

4 . The synergistic corrosion inhibitor of claim 3 , wherein the at least one quaternized amine is selected from the group consisting of di(dimethyl(alkyl)ammonium chloride) ethanoyloxy-oxo, methyl quaternized N-methyl dialkanolamine and fatty acid diacid copolymers, and esterified diquaternary amines.

5 . The synergistic corrosion inhibitor of claim 1 , wherein the at least one phosphate-containing compound is selected from the group consisting of phosphate esters, ethoxylated phosphate esters, sodium hydroxypropylphosphate laurylglucoside crosspolymers, sodium laurylglucoside hydroxy propyl phosphates, and sodium cocoglucosides hydroxypropyl phosphates.

6 . The synergistic corrosion inhibitor of claim 1 , wherein the at least one imidazoline-like compound is selected from the group consisting of ethoxylated quaternized imidazolines, ethoxylated imidazolines, naphthenic acid imidazolines, imidazolines that are reaction products of tall oil fatty acid and diethylenetriamine, and combinations thereof.

7 . A synergistic corrosion inhibitor comprising:
a first component selected from the group consisting of glycolipids and quaternized amines; and a second component selected from the group consisting of phosphate-containing compounds and imidazoline-containing compounds.

8 . The synergistic corrosion inhibitor of claim 7 , wherein the first component is a glycolipid selected from the group consisting of sophorolipids and rhamnolipids.

9 . The synergistic corrosion inhibitor of claim 7 , wherein the first component is a quaternized amine comprising ester and alkoxy functional groups.

10 . The synergistic corrosion inhibitor of claim 9 , wherein the quaternized amine is selected from the group consisting of di(dimethyl(alkyl)ammonium chloride) ethanoyloxy-oxo, methyl quaternized N-methyl dialkanolamine and fatty acid diacid copolymers, and esterified diquaternary amines.

11 . The synergistic corrosion inhibitor of claim 7 , wherein the second component is a phosphate-containing compound selected from the group consisting of phosphate esters, ethoxylated phosphate esters, sodium hydroxypropylphosphate laurylglucoside crosspolymers, sodium laurylglucoside hydroxy propyl phosphates, and sodium cocoglucosides hydroxypropyl phosphates.

12 . The synergistic corrosion inhibitor of claim 7 , wherein the second component is an imidazoline-like compound selected from the group consisting of ethoxylated quaternized imidazolines, ethoxylated imidazolines, naphthenic acid imidazolines, imidazolines that are reaction products of tall oil fatty acid and diethylenetriamine, and combinations thereof.

13 . The synergistic corrosion inhibitor of claim 7 , wherein the first component is a quaternized amine, and the second component is a phosphate-containing compound.

14 . The synergistic corrosion inhibitor of claim 13 , wherein the phosphate-containing compound is selected from the group consisting of ethoxylated phosphate esters, sodium hydroxypropylphosphate laurylglucoside crosspolymers, and sodium laurylglucoside hydroxy propyl phosphates.

15 . The synergistic corrosion inhibitor of claim 7 , wherein the first component is a quaternized amine, and the second component is an imidazoline-like compound.

16 . The synergistic corrosion inhibitor of claim 15 , wherein the imidazoline-like compound is an ethoxylated quaternized imidazoline.

17 . The synergistic corrosion inhibitor of claim 7 , wherein the weight ratio of first component to second component ranges from about 20:1 to about 1:20.

18 . An oil or gas production fluid comprising:
a hydrocarbon selected from the group consisting of oil, natural gas, and combinations thereof; brine; a corrosive component; and a synergistic corrosion inhibitor comprising a blend selected from the group consisting of:
glycolipids and phosphate-containing compounds;
quaternized amines and imidazoline-like compounds;
quaternized amines and phosphate-containing compounds; and
combinations of these blends.

19 . The oil or gas production fluid of claim 18 , wherein the corrosive component is an acid gas selected from the group consisting of carbon dioxide and hydrogen sulfide.

20 . The oil or gas production fluid of claim 18 , wherein the amount of synergistic corrosion inhibitor in the fluid ranges from about 1 ppm to about 500 ppm.

Assignees

• Baker Hughes Oilfield Operations Llc

Inventors

• Menendez Carlos M
• Ramachandran Sunder
• Jackson Tracey

Classifications

• C23F11/128

  Esters of carboxylic acids · CPC title

• C23F11/173

  Macromolecular compounds · CPC title

• C23F11/141

  Amines; Quaternary ammonium compounds · CPC title

• C09K2208/32

  Anticorrosion additives · CPC title

• C23F11/167

  Phosphorus-containing compounds · CPC title