US3743018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil recovery process using an unhydrolyzed polyacrylamide and partially hydrolyzed polyacrylamide mobility control agent
Assignee: Marathon Oil Co
•
Filing: 1971-07-19
•
Granted: 1973-07-03
•
Expires: 1991-07-19
Abstract
Abstract A mixture of unhydrolyzed polyacrylamide together with partially hydrolyzed polyacrylamide is used for recovery of petroleum. The partially hydrolyzed material reduces permeability and the unhydrolyzed material maintains viscosity.
Inventors
- 👤 C Norton
- 👤 D Falk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:23
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58; C09K8/588; Y; Y10; Y10S; Y10S507/00; Y10S507/935; Y10S507/936
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
25 words
Processes according to claim 1 wherein the partially hydrolyzed polyacrylamide polymer has a molecular weight above 100,000 prior to comixing with said unhydrolyzed polyacrylamide polymer.
Claim 2
Dependent Claim
35 words
Processes according to claim 1 wherein the partially hydrolyzed polyacrylamide has a molecular weight of from about 1, 000,000 to about 10,000,000 and is hydrolyzed to from about 0.1 to about 70 percent of theory.
Claim 3
Dependent Claim
22 words
Process according to claim 1 wherein the aqueous solution is characterized by a viscosity of from about 1.5 to about 1,000 centipoises.
Claim 4
Dependent Claim
22 words
Process according to claim 4 wherein the aqueous solution is characterized by a viscosity of from about 5 to about 500 centipoises.
Claim 5
Dependent Claim
22 words
Process according to claim 4 wherein the aqueous solution is characterized by a viscosity of from about 10 to about 100 centipoises.
References Cited (Backward Citations)
US2827964A
Cited
US3039529A
Cited
US3343601A
Cited
US3543855A
Cited
US3476186A
Cited
US3634305A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |