US4529523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrophobically modified polymers
Assignee: Aqualon Co
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Filing: 1982-06-08
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Granted: 1985-07-16
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Expires: 2002-06-08
Abstract
Abstract The amount of oil which can be recovered from an oil containing subterranean formation is increased by using a water flooding medium. The performance of a water flooding medium is improved where a nonionic, hydrophobically modified, water-soluble polymer, is used as a thickener.
Inventors
- 👤 Leo M. Landoll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:06
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58; C09K8/588; Y; Y10; Y10S; Y10S507/00; Y10S507/935; Y10S507/936
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
In the method of enhancing the recovery of oil from an oil-containing formation by means of a polymer thickened water flooding medium, the improvement comprising the thickener for said water flooding medium being from about 0.1 to about 2.0%, by weight of the water flooding medium, of a nonionic water-soluble copolymer of ethylene oxide and an epoxy-n-alkane, where the alkane moiety is present in the copolymer in an amount from about 0.2 to about 2.0%, by weight of the copolymer, and contains 8 to 25 carbon atoms, and where the copolymer has a molecular weight of 50,000 to 1,000,000.
Claim 2
Dependent Claim
99 words
In the method of enhancing the recovery of oil from an oil-containing formation by means of a polymer thickened water flooding medium, the improvement comprising the thickener for said water flooding medium being from about 0.1 to about 2.0%, by weight of the water flooding medium, of a nonionic water-soluble copolymer of ethylene oxide and an epoxy-n-alkane, where the alkane moiety is present in the copolymer in an amount from about 0.2 to about 2.0%, by weight of the copolymer, and contains 8 to 25 carbon atoms, and where the copolymer has a molecular weight of 50,000 to 1,000,000.
References Cited (Backward Citations)
US3282337A
Cited
US3399725A
Cited
US3815679A
Cited
US4074759A
Cited
US4099569A
Cited
US4151333A
Cited
US4297226A
Cited
US4326969A
Cited
US4326970A
Cited
US4228277A
Cited
US4228277B1
Cited
US4243802A
Cited
US4304902A
Cited
US4432881A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-15 | 1989-01-14 | 1989-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-15 | 1993-01-14 | 1993-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-15 | 1997-01-14 | 1997-07-16 | $7700.00 | Window Closed / Lapsed |