US2827964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Secondary recovery of petroleum
Assignee: Union Oil Company of California
•
Filing: 1956-06-11
•
Granted: 1958-03-25
•
Expires: 1976-06-11
Abstract
No abstract record available.
Inventors
- 👤 Burton B Sandiford
- 👤 Jr Howard F Keller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:12
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
150 words
THE PROCESS FOR RECOVERING OIL FROM A SUBTERRANEAN OIL-BEARING FORMATION WHICH COMPRISES INTRODUCING INTO AN INPUT WELL PENETRATING SAID FORMATION OF FLOODING MEDIUM CONSISTING ESSENTIALLY OF AN AQUEOUS SOLUTION OF A WATERSOLUBLE PARTIALLY HYDROLYZED ACRYLAMIDE POLYMER AND FORCING SAID MEDIUM THROUGH SAID FORMATION TOWARD AT LEAST ONE OUTPUT WELL PENETRATING SAID FORMATION AT A DISTANCE FROM SAID INPUT WELL, SAID POLYMER HAVING A MOLECULAR WEIGHT SUCH THAT A 0.5 PERCENT BY WEIGHT AQUEOUS SOLUTION OF THE SAME HAS A VISCOSITY OF AT LEAST ABOUT 4 CPS. CPS. OSTWALD AT 21.5*C. ABOUT 0.8 AND ABOUT 10 TO SUCH AN EXTENT THAT BETWEEN ABOUT 0.8 AND ABOUT 10 PERCENT OF THE AMIDE GROUPS ORIGINALLY PRESENT IN THE UNHYDROLYZED POLYMER HAVE BEEN CONVERTED INTO CARBOXYL GROUPS, AND SAID POLYMER BEING EMPLOYED IN SUCH AMOUNT THAT THE SAID FLOODING MEDIUM HAS A VISCOSITY BETWEEN ABOUT 1 AND ABOUT 1000 CPS. AT THE FORMATION TEMPERATURE.
Claim 2
Dependent Claim
150 words
THE PROCESS FOR RECOVERING OIL FROM A SUBTERRANEAN OIL-BEARING FORMATION WHICH COMPRISES INTRODUCING INTO AN INPUT WELL PENETRATING SAID FORMATION OF FLOODING MEDIUM CONSISTING ESSENTIALLY OF AN AQUEOUS SOLUTION OF A WATERSOLUBLE PARTIALLY HYDROLYZED ACRYLAMIDE POLYMER AND FORCING SAID MEDIUM THROUGH SAID FORMATION TOWARD AT LEAST ONE OUTPUT WELL PENETRATING SAID FORMATION AT A DISTANCE FROM SAID INPUT WELL, SAID POLYMER HAVING A MOLECULAR WEIGHT SUCH THAT A 0.5 PERCENT BY WEIGHT AQUEOUS SOLUTION OF THE SAME HAS A VISCOSITY OF AT LEAST ABOUT 4 CPS. CPS. OSTWALD AT 21.5*C. ABOUT 0.8 AND ABOUT 10 TO SUCH AN EXTENT THAT BETWEEN ABOUT 0.8 AND ABOUT 10 PERCENT OF THE AMIDE GROUPS ORIGINALLY PRESENT IN THE UNHYDROLYZED POLYMER HAVE BEEN CONVERTED INTO CARBOXYL GROUPS, AND SAID POLYMER BEING EMPLOYED IN SUCH AMOUNT THAT THE SAID FLOODING MEDIUM HAS A VISCOSITY BETWEEN ABOUT 1 AND ABOUT 1000 CPS. AT THE FORMATION TEMPERATURE.
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) | 1961-03-24 | 1961-09-23 | 1962-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-24 | 1965-09-23 | 1966-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-24 | 1969-09-23 | 1970-03-25 | $7700.00 | Window Closed / Lapsed |