US4250042A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion inhibition in well-drilling operations using aqueous systems containing ammonium carboxylates
Assignee: Lubrizol Corp
•
Filing: 1979-04-16
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Granted: 1981-02-10
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Expires: 1999-04-16
Abstract
Abstract Certain salts of polycarboxylic acids and amino compounds are useful as corrosion inhibitors in aqueous systems used in well-drilling operations. Typical such corrosion inhibitors are made from acids such as sebacic and azelaic acid and amino compounds such as ammonia, ethanol amine, di- and tri-ethanol amines and N,N-diethyl-ethanol amine.
Inventors
- 👤 William A. Higgins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:47
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/54; C09K8/02; C09K8/03; C09K8/035; Y; Y10; Y10S; Y10S507/00; Y10S507/939
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
66 words
A method of inhibiting metal corrosion in earth drilling operations employing aqueous drilling fluids which comprises including in the drilling fluids employed in such operations at least one water-soluble ammonium carboxylate salt made from at least one polycarboxylic acid (I) corresponding to the formula R(COOH).sub.2-3 (I) wherein R is an alkylene, alkenylene or hydroxyl alkylene group of about 4 to about 15 carbons, with (II) ammonia
Claim 2
Independent Claim
66 words
A method of inhibiting metal corrosion in earth drilling operations employing aqueous drilling fluids which comprises including in the drilling fluids employed in such operations at least one water-soluble ammonium carboxylate salt made from at least one polycarboxylic acid (I) corresponding to the formula R(COOH).sub.2-3 (I) wherein R is an alkylene, alkenylene or hydroxyl alkylene group of about 4 to about 15 carbons, with (II) ammonia
Claim 3
Dependent Claim
37 words
A method as described in claim 1 wherein the drilling fluid is used in the presence of oxygen gas such that the partial pressure of said oxygen is above that found in ambient air at sea level.
Claim 4
Dependent Claim
20 words
A method as described in claim 1 wherein the group R of the acid (I) is an unbranched, polymethylene group.
Claim 5
Dependent Claim
25 words
A method as described in claim 3 wherein the acid (I) is selected from the group consisting of sebacic, azelaic, dodecanedioic acids and mixtures thereof.
Claim 6
Dependent Claim
37 words
A method as described in claim 4 wherein the drilling fluid is used in the presence of oxygen gas such that the partial pressure of said oxygen is above that found in ambient air at sea level.
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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) | 1984-02-10 | 1984-08-11 | 1985-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-10 | 1988-08-11 | 1989-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-10 | 1992-08-11 | 1993-02-10 | $7700.00 | Window Closed / Lapsed |