US3623979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition and process for inhibiting corrosion in oil wells
Assignee: Texaco Inc
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Filing: 1967-06-29
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Granted: 1971-11-30
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Expires: 1987-06-29
Abstract
Abstract Amide condensation products of polymeric acid and 1-aminoalkyl2-alkyl-2-imidazoline for use in compositions of oil-soluble, brine-dispersible corrosion inhibitors. Continuous or intermittent application of liquid coatings of these inhibitors on metals, particularly ferrous metals, in contact with sweet and sour petroliferous well fluids, form persistent films which afford excellent protection against corrosion, even at elevated temperature.
Inventors
- 👤 Jim Maddox Jr
- 👤 William SCHOEN
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:29
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/14; C23F11/149; Y; Y10; Y10S; Y10S507/00; Y10S507/939
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
78 words
The corrosion-inhibiting composition according to claim 1 in which the 1-aminoalkyl-2-alkyl-2-imidazoline of a is made by the reaction of a tall oil fatty acid selected from the group consisting of linoleic, conjugated linoleic, oleic, and stearic, and a polyalkylene polyamine selected from the group consisting of diethylenetriamine, triethylenetetramine, and tetraethylenepentamine; and the polymeric acid is a dicarboxylic acid having a molecular weight of about 600 and comprising approximately 70 to 76 percent by weight of dimerized linoleic acid.
Claim 2
Dependent Claim
170 words
A high-density corrosion-inhibiting composition in percentage by weight a. from about 15 to 35 percent of an amide condensation product of polymeric acid and 1-aminoalkyl-2-alkyl-2-imidazoline represented by the formula in which R is a tall oil fatty acid residual hydrocarbon radical containing from 17 to 32 carbon atoms; A is a bivalent ethylene radical; m is an integer from 1 to 6; R'' is a residual hydrocarbon radical of a polymeric acid containing from 15 to 70 carbon atoms and is selected from the group consisting of dimer, trimer, and higher molecular weight polymerized carboxylic fatty acids and mixtures thereof; and n is an integer from 2 to 4 and indicates the basicity of the polymeric acid; b. from about 1 to 10 percent of a releasing agent selected from the group consisting of cocoamine acetate and tall oil imidazoline acetate; c. from about 30 to 60 percent of zinc chloride weighting agent; d. from about 10 to 20 percent isopropanol; and e. from about 10 to 20 percent water.
Claim 3
Dependent Claim
152 words
An oil-soluble, brine-dispersible corrosion-inhibiting composition consisting of a. from about 15 to 35 weight-percent of amide condensation product of polymeric acid and 1-aminoalkyl-2-alkyl-2-imidazoline represented by the formula in which R is a tall oil fatty acid residual hydrocarbon radical containing from 17 to 32 carbon atoms; A is a bivalent ethylene radical; m is an integer from 1 to 6; R'' is a residual hydrocarbon radical of a polymeric acid containing from 15 to 70 carbon atoms and is selected from the group consisting of dimer, trimer, and higher molecular weight polymerized carboxylic fatty acids and mixtures thereof; and n is an integer from 2 to 4 and indicates the basicity of the polymeric acid. b. from about 0.5 to 10 weight-percent of an ethoxylated polypropylene glycol demulsifying agent; and c. from about 55 to 85 weight-percent of light gas oil aromatic solvent mutually soluble in oil and components a and b.
Claim 4
Independent Claim
117 words
A method of protecting metals from corrosive agents in sweet and sour petroliferous well fluids which comprises contacting the metal with an amide condensation product represented by the formula in which R is a tall oil fatty acid residual hydrocarbon radical containing from 17 to 32 carbon atoms; A is a bivalent ethylene radical; m is an integer from 1 to 6; R'' is a residual hydrocarbon radical of a polymeric acid containing from 15 to 70 carbon atoms and is selected from the group consisting of dimer, trimer, and higher molecular weight polymerized carboxylic fatty acids and mixtures thereof, and n is an integer from 2 to 4 and indicates the basicity of the polymeric acid.
Claim 5
Dependent Claim
50 words
A process of inhibiting corrosion of ferrous oil and gas well equipment in contact with sweet and sour petroliferous well fluids comprising, mixing said well fluids with the inhibiting composition of claim 1 to effect a minimum concentration by weight of inhibitor to well fluids of 10 parts per million.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |