Method of inhibiting corrosion of metal piping in an oil/gas well
AssigneeImam Abdulrahman Bin Faisal University
InventorAeshah Hassan Saeed ALAMRI
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Abstract
A corrosion inhibitor composition is described. The corrosion inhibitor composition includes 1 to 15 weight percentage (wt. %) of a polymer having at least one vinylpyrrolidone unit and at least one vinyl acetate unit, 0.1 to 1 wt. % of a thioamide having 2 to 20 carbon atoms, 1 to 5 wt. % of a thioalcohol having 2 to 8 carbon atoms, 1 to 3 wt. % of a surfactant, 0 to 15 wt. % of an aliphatic alcohol having 1 to 8 carbon atoms, 30 to 60 wt. % of a solvent, and each wt. % based on a total weight of the corrosion inhibitor composition. The present disclosure also describes a method for inhibiting corrosion of a metal with the corrosion inhibitor composition of the present disclosure.
Claims20
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The method of claim 10, wherein the corrosion inhibitor composition, the polymer is a poly(1-vinylpyrolidone-co-vinylacetate).
The method of claim 10, wherein the corrosion inhibitor composition, the thioamide is thiobenzamide.
The method of claim 10, wherein the corrosion inhibitor composition, the thioalcohol is 2-mercaptoethanol.
The method of claim 10, wherein the corrosion inhibitor composition, the surfactant is a non-ionic surfactant of formula (II)
- wherein:
- R is selected from the group consisting of a hydrocarbon chain having 8 to 22 carbon atoms, an optionally substituted alkyl, and an optionally substituted cycloalkyl;
- each of w, x, y, and z is an integer of from 1 to 20 inclusive;
- and
- w+x+y+z=20.
The method of claim 10, wherein the corrosion inhibitor composition, the aliphatic alcohol is methanol.
The method of claim 10, wherein the corrosion inhibitor composition, the solvent is water.
A method for inhibiting corrosion of a metal piping in an oil or gas well containing a corrosive fluid, comprising:
- adding a corrosion inhibitor composition to the corrosive fluid in the oil or gas well to contact the corrosion inhibitor with the metal piping in an amount of 10 to 1000 ppm based on a total number of parts by weight of the corrosive fluid,
- wherein the corrosive fluid comprises carbon dioxide and/or halides in an amount of at least 0.5 g carbon dioxide and/or halides per kg of the corrosive fluid, and
- wherein the corrosion inhibitor composition comprises:
- 1 to 15 wt % of a polymer having at least one vinylpyrrolidone unit and at least one vinyl acetate unit;
- 0.1 to 1 wt % of a thioamide having 2 to 20 carbon atoms;
- 1 to 5 wt % of a thioalcohol having 2 to 8 carbon atoms;
- 1 to 3 wt % of a surfactant;
- 0 to 15 wt % of an aliphatic alcohol having 1 to 8 carbon atoms;
- and
- 30 to 60 wt % of a solvent, each wt % based on a total weight of the corrosion inhibitor composition.
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Dependencies are inferred from the claim text.