US3563315A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well cleaning method
Assignee: Pan American Petroleum Corp
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Filing: 1969-07-08
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Granted: 1971-02-16
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Expires: 1989-07-08
Abstract
Abstract Removal of corrosion-inhibiting film from metal surfaces by solvents containing carbon disulfide is prevented by including a small amount of the inhibitor in the solvent.
Inventors
- 👤 Edwin E Claytor Jr
- 👤 David W Simms
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:22
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/54; E; E21; E21B; E21B41/00; E21B41/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
51 words
The method of claim 1 in which said amine has from about 12 to about 20 carbon atoms per molecule and said acid has from about 10 to about 20 carbon atoms per molecule and the concentration of said amine salt is between about 2 and about 4 percent by weight.
Claim 2
Independent Claim
158 words
A method for treating a well in which corrosion of metal surfaces exposed to said well takes place and in which paraffin deposition occurs in at least one of the well and the formation penetrated by said well, the method comprising: contacting said exposed metal surfaces with a corrosion-inhibiting amine salt of a carboxylic acid whereby a corrosion-inhibiting film of the amine salt is deposited on the metal surfaces; when a troublesome amount of paraffin has deposited, contacting said paraffin with a paraffin solvent containing carbon disulfide and at least about 1 percent by weight of an amine salt of a carboxylic acid, said amine having at least about 10 carbon atoms per molecule and said acid having at least about 6 carbon atoms per molecule, whereby said paraffin is removed by said solvent without removal of said amine salt film by said carbon disulfide; and then resuming contacting of exposed metal surfaces with said corrosion-inhibiting amine salt.
Claim 3
Dependent Claim
51 words
The method of claim 3 in which said amine has from about 12 to about 20 carbon atoms per molecule and said acid has from about 10 to about 20 carbon atoms per molecule and the concentration of said amine salt is between about 2 and about 4 percent by weight.
References Cited (Backward Citations)
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US3070162A
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US3437146A
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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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |