Corrosion inhibitor composition for wet sour crude

Patent metadata

Field	Value
Publication number	US-2024301275-A1
Application number	US-202318179827-A
Country	US
Kind code	A1
Filing date	Mar 7, 2023
Priority date	Mar 7, 2023
Publication date	Sep 12, 2024
Grant date	—

Abstract

A method of inhibiting sour corrosion of a metal surface including contacting the metal surface and composition in a corrosive medium. The corrosive medium includes hydrogen sulfide. The composition includes an aliphatic alcohol comprising 1 to 6 carbons, a polysorbate, a glycol compound, and a substituted benzimidazole compound. The composition includes a weight ratio of the substituted benzimidazole compound to the polysorbate of 1 to 3.

First claim

1 . A method of inhibiting sour corrosion of a metal surface, comprising:
contacting the metal surface with a composition in the presence of a corrosive medium; wherein the corrosive medium comprises hydrogen sulfide; wherein the composition comprises: an aliphatic alcohol comprising 1 to 6 carbons;
a polysorbate;
a glycol compound; and
a substituted benzimidazole compound,
wherein the composition comprises a weight ratio of the substituted benzimidazole compound to the polysorbate of 1 to 3.

2 . The method of claim 1 , wherein the substituted benzimidazole compound is at least one selected from the group consisting of 2-(2-pyridyl)benzimidazole, 2-(4-methyl-2-pyridyl)-1H-benzimidazole, and 2-(4-ethyl-2-pyridinyl)-1H-benzimidazole.

3 . The method of claim 1 , wherein the polysorbate is selected from the group consisting of polysorbate 20, polysorbate 40, polysorbate 60, and polysorbate 80.

4 . The method of claim 1 , wherein the glycol compound is selected from the group consisting of ethylene glycol and propylene glycol.

5 . The method of claim 1 , wherein the aliphatic alcohol is selected from the group consisting of methanol, ethanol, n-propanol, 2-propanol, n-butanol, isobutyl alcohol, tert-butyl alcohol, and 2,2-dimethyl-1-propanol.

6 . The method of claim 1 , wherein the composition comprises 1-10 wt. % of the substituted benzimidazole compound, 3-30 wt. % of the polysorbate, 35-50 wt. % of the glycol compound, and 35-45 wt. % of the aliphatic alcohol, based on the total weight of the composition.

7 . The method of claim 1 , wherein the composition does not comprise a quaternary ammonium salt, a mercaptocarboxylic acid, a 2-thioxodihydropyrimidine-dione, a sulfhydryl alcohol, glutathione, or a metal iodide.

8 . The method of claim 1 , wherein the metal surface is made from at least one material selected from the group consisting of carbon steel, stainless steel, iron, copper, nickel, and alloys thereof.

9 . The method of claim 1 , wherein the metal surface is carbon steel, and wherein the carbon steel comprises:
0.05-0.5 wt. % C; 0.5-2 wt. % Mn; 0.001 to 0.01 wt. % S; 0.005-0.05 wt. % P; 0.05-0.5 wt. % Cu; 0.01-0.05 wt. % Si; 0.01-0.1 wt. % Cr; 0.005-0.05 wt. % Mo; 0.01-0.1 wt. % Ni; 0.01-0.1 wt. % Cr; and Fe as a balance.

10 . The method of claim 1 , wherein the corrosive medium further comprises at least one salt selected from the group consisting of an alkali metal salt, an alkaline earth metal salt, and hydrates thereof.

11 . The method of claim 1 , wherein the corrosive medium further comprises 1-10 wt. % NaCl, 0.1-1 wt. % CaCl 2 ), and 0.01-1 wt. % MgCl 2 , based on the total mass of the corrosive medium.

12 . The method of claim 1 , wherein the corrosive medium further comprises carbon dioxide.

13 . The method of claim 1 , wherein the composition has a concentration of 25-200 parts per million (ppm) in the corrosive medium.

14 . The method of claim 1 , wherein the composition has a concentration of 75-125 ppm in the corrosive medium.

15 . The method of claim 1 , wherein the metal surface is at least partially coated with at least one layer of the composition prior to the contacting.

16 . The method of claim 1 , wherein the corrosive medium has a temperature of 30-70° C.

17 . The method of claim 1 , wherein the metal surface has a corrosion rate of less than 10 mils per year (mpy) in the corrosive medium.

18 . The method of claim 1 , wherein the metal surface has the corrosion rate of less than 6 mpy in the corrosive medium.

19 . The method of claim 1 , wherein the contacting is for at least 24 hours.

20 . The method of claim 1 , wherein the metal surface is part of a system for oil or gas production, transportation, or refining.

Assignees

• Univ King Fahd Pet & Minerals

Inventors

• Obot Ime Bassey

Classifications

• C23F11/00

  Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent (adding inhibitors to mineral oil, fuels, or lubricants C10; adding inhibitors to pickling solutions C23G) · CPC title

• C23F11/149

  Heterocyclic compounds containing nitrogen as hetero atom · CPC title

• C23F11/10

  using organic inhibitors · CPC title

• C09K8/54 Primary

  Compositions for in situ inhibition of corrosion in boreholes or wells · CPC title

• C23F11/146

  containing a multiple nitrogen-to-carbon bond · CPC title