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US3770055A
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Film forming hydrazine-containing corrosion inhibitor
Assignee: Marathon Oil Co
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Filing: 1971-10-29
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Granted: 1973-11-06
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Expires: 1991-10-29
Abstract
Abstract Corrosion rates in oil wells are reduced by injecting the combination of about 2-200 ppm. of a film-forming nitrogencontaining corrosion inhibitor (e.g. an imidazoline compound) and about 0.01-1.0 ppm. of residual hydrazine, the ppm. based on water either produced or injected through the well, e.g. water produced in a gas lift well or water injected into an injection well. Such is especially useful with water injection wells, gas lift wells, etc.
Inventors
- 👤 A Larsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:21
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/54; C23; C23F; C23F11/00; C23F11/08; Y; Y10; Y10S; Y10S166/00; Y10S166/902; Y10S507/00; Y10S507/939
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
46 words
an acid selected from the group consisting of hydrochloric acid and an organic carboxylic acid containing 1 to about 14 carbon atoms, the ppm based on the water and the amount of injected hydrazine being less than the molecular equivalent of oxygen present in the water.
Claim 2
Dependent Claim
20 words
The process of claim 1 wherein about 0.1 to about 0.5 ppm. of residual hydrazine is injected into the well.
Claim 3
Dependent Claim
23 words
The process of claim 1 wherein about 10 to about 20 ppm. of the film-forming nitrogen-containing corrosion inhibitor is injected into the well.
Claim 4
Dependent Claim
13 words
The process of claim 1 wherein the well is a gas lift well.
Claim 5
Dependent Claim
13 words
The process of claim 1 wherein the well is a water injection well.
Claim 6
Independent Claim
64 words
A method of reducing the corrosion rate in a well and associated conduits and gathering systems wherein water is either produced or injected and the average temperature of the water is up to about 135*F., the method comprising injecting into the well about 0.01 to about 1.0 ppm of residual hydrazine and about 2 to about 200 ppm of a salt obtained by reacting:
Claim 7
Dependent Claim
11 words
The process of claim 6 wherein the acid is acetic acid.
Claim 8
Dependent Claim
13 words
The process of claim 1 wherein the well is a gas lift well.
Claim 9
Dependent Claim
13 words
The process of claim 1 wherein the well is a water injection well.
References Cited (Backward Citations)
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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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |