Patent US3308885A successfully refreshed from Google Patents.
US3308885A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of subsurface hydrocarbon fluid-bearing formations to reduce water production therefrom
Assignee: Union Oil Company of California
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Filing: 1965-12-28
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Granted: 1967-03-14
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Expires: 1985-12-28
Abstract
No abstract record available.
Inventors
- 👤 Burton B Sandiford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:22
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/84; C09K8/86; C09K8/88; C09K8/882
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
A METHOD FOR RECOVERING FLUID HYDROCARBONS FROM A SUBTERRANEAN FORMATION WHICH IS JPENETRATED BY A WELL BORE, AND FOR REDUCING THE CONCOMITANT PRODUCTION OF RESERVOIR WATER THEREFROM, WHICH COMPRISES: INJECTING INTO SAID FORMATION THROUGH SAID WELL BORE AN AQUEOUS TREATING SOLUTION COMPRISING A MINOR PROPORTION OF A WATER-SOLUBLE, PARTIALLY HYDROLYZED POLYACRYLAMIDE TREATING AGENT HAVING A MOLECULAR WEIGHT IN EXCESS OF ABOUT 200,000, AT LEAST ABOUT 8% BUT NOT MORE THAN ABOUT 70% OF THE AMIDE GROUPS THEREOF THAVING BEEN HYDROLYZED TO CARBOXYL GROUPS, THEN TERMINATING THE INJECTION OF SAID TREATING AGENT AND THEREAFTER PLACING THE TREATED WELL ON PRODUCTION.
Claim 2
Independent Claim
99 words
A METHOD FOR RECOVERING FLUID HYDROCARBONS FROM A SUBTERRANEAN FORMATION WHICH IS JPENETRATED BY A WELL BORE, AND FOR REDUCING THE CONCOMITANT PRODUCTION OF RESERVOIR WATER THEREFROM, WHICH COMPRISES: INJECTING INTO SAID FORMATION THROUGH SAID WELL BORE AN AQUEOUS TREATING SOLUTION COMPRISING A MINOR PROPORTION OF A WATER-SOLUBLE, PARTIALLY HYDROLYZED POLYACRYLAMIDE TREATING AGENT HAVING A MOLECULAR WEIGHT IN EXCESS OF ABOUT 200,000, AT LEAST ABOUT 8% BUT NOT MORE THAN ABOUT 70% OF THE AMIDE GROUPS THEREOF THAVING BEEN HYDROLYZED TO CARBOXYL GROUPS, THEN TERMINATING THE INJECTION OF SAID TREATING AGENT AND THEREAFTER PLACING THE TREATED WELL ON PRODUCTION.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-13 | 1970-09-12 | 1971-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-13 | 1974-09-12 | 1975-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-13 | 1978-09-12 | 1979-03-14 | $7700.00 | Window Closed / Lapsed |