Patent US3841399A successfully refreshed from Google Patents.
US3841399A
Expired / Lapsed
US
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Secondary oil recovery
Assignee: ChampionX LLC
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Filing: 1973-01-29
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Granted: 1974-10-15
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Expires: 1993-01-29
Abstract
Abstract Recovery of oil from a well is improved by producing down-hole hydrolysis of a synthetic emulsion copolymer.
Inventors
- 👤 R Ryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:23
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58; C09K8/588
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
45 words
IN A METHOD OF RECOVERY OF PETROLEUM AT AN OIL WELL, THE IMPROVEMENT COMPRISING: PUMPING CONCURRENTILY INTO A PRODUCING WELL OR AN INJECTION WELL AN AQUEOUS SYNTHETIC EMULSION COPOLYMER CONSISTING OF ACRYLONITRILE AND ETHYL ECRYLATE, AND CAUSTIIC WHICH PRODUCES DOWN-HOLE HYDROLYSIS OF THE EMULSION COPOLYMER.
Claim 2
Dependent Claim
45 words
IN A METHOD OF RECOVERY OF PETROLEUM AT AN OIL WELL, THE IMPROVEMENT COMPRISING: PUMPING CONCURRENTILY INTO A PRODUCING WELL OR AN INJECTION WELL AN AQUEOUS SYNTHETIC EMULSION COPOLYMER CONSISTING OF ACRYLONITRILE AND ETHYL ECRYLATE, AND CAUSTIIC WHICH PRODUCES DOWN-HOLE HYDROLYSIS OF THE EMULSION COPOLYMER.
Claim 3
Dependent Claim
25 words
A method according to claim 1 in which down-hole hydrolysis is delayed by selecting and imposing a concentration of caustic in terms of down-hole temperature.
References Cited (Backward Citations)
US2827964A
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US2959574A
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US3370649A
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US3502146A
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US3603397A
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US3610339A
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US3684014A
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US3709297A
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US3794115A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |