Oil and gas field corrosion inhibitor compositions
AssigneesKao Corporation, Chemeor, Inc.
InventorsFei Meng, Mitsuru Uno, Yongchun Tang
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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.
Claims20
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.
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.
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.
Dependencies are inferred from the claim text.