US3815679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Secondary oil recovery process using beta-substituted acrylamide polymers
Assignee: Texaco Inc
•
Filing: 1972-11-17
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Granted: 1974-06-11
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Expires: 1992-11-17
Abstract
Abstract An improved secondary recovery process which comprises injecting a viscous aqueous solution containing a beta-substituted acrylamide polymer, which can be partially hydrolyzed, if desired, into a subterranean oil-containing reservoir via an injection well, forcing the solution through the formation and recovering oil via a production well.
Inventors
- 👤 J Blanke
- 👤 C Christopher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:00
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58; C09K8/588; E; E21; E21B; E21B43/00; E21B43/16; E21B43/20; Y; Y10; Y10S; Y10S507/00; Y10S507/935; Y10S507/936
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
22 words
The process of claim 1 wherein the beta-substituted polyacrylamide has a number average molecular weight of from about 300,000 up to 1,500,000.
Claim 2
Dependent Claim
14 words
The process of claim 1 wherein the said polyacrylamide is a polymer of 2-hexenamide.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein the beta-substituted polyacrylamide is a hydrolyzed polyacrylamide.
Claim 4
Dependent Claim
14 words
The process of claim 1 wherein the polyacrylamide is a hydrolyzed polymer of 2-hexenamide.
References Cited (Backward Citations)
US3039529A
Cited
US3282337A
Cited
US3370649A
Cited
US3399725A
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US3543855A
Cited
US3476186A
Cited
US3684014A
Cited
US3679000A
Cited
US3734183A
Cited
US3744566A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |