Patent US3335792A successfully refreshed from Google Patents.
US3335792A
Expired / Lapsed
US
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Method for increasing oil recovery
Assignee: Union Oil Company of California
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Filing: 1964-12-18
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Granted: 1967-08-15
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Expires: 1984-12-18
Abstract
No abstract record available.
Inventors
- 👤 Leo J O'brien
- 👤 Allyn T Sayre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:34
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/50; C09K8/516; C09K8/518; C09K8/58; C09K8/584; C09K8/60; C09K8/62; C09K8/70; C09K8/703; C09K8/72; C09K8/74; C09K8/92; C09K8/94
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
IN THE RECOVERY OF PETROLEUM FROM A SUBTERRANEAN FORMATION PENETRATED BY AN INJECTION WELL AND A PRODUCTION WELL WHEREIN A FOAM BANK IS DRIVEN THROUGH THE FORMATION BY AN AQUEOUS DRIVING FLUID, THE IMPROVEMENT WHICH COMPRISES INJECTING INTO SAID FORMATION THROUGH SAID INJECTION WELL A SUBSTANTIALY NON-GASEOUS DILUTE SURFACTANT SOLUTION IMMEDIATELY AFTER THE FOAM BANK AND PRIOR TO THE INJECTION OF THE DRIVING FLUID, SAID SURFACTANT SOLUTION BEING SUFFICIENT IN QUANTITY TO FOR A BUFFER ZONE BETWEEN SAID FOAM BANK AND SAID DRIVING FLUID WHEREBY SAID FOAM BANK SUBSTANTIALLY MAINTAINS ITS INTEGRITY AND THEREAFTER RECOVERING PETROLEUM FROM SAID PRODUCTION WELL.
Claim 2
Dependent Claim
100 words
IN THE RECOVERY OF PETROLEUM FROM A SUBTERRANEAN FORMATION PENETRATED BY AN INJECTION WELL AND A PRODUCTION WELL WHEREIN A FOAM BANK IS DRIVEN THROUGH THE FORMATION BY AN AQUEOUS DRIVING FLUID, THE IMPROVEMENT WHICH COMPRISES INJECTING INTO SAID FORMATION THROUGH SAID INJECTION WELL A SUBSTANTIALY NON-GASEOUS DILUTE SURFACTANT SOLUTION IMMEDIATELY AFTER THE FOAM BANK AND PRIOR TO THE INJECTION OF THE DRIVING FLUID, SAID SURFACTANT SOLUTION BEING SUFFICIENT IN QUANTITY TO FOR A BUFFER ZONE BETWEEN SAID FOAM BANK AND SAID DRIVING FLUID WHEREBY SAID FOAM BANK SUBSTANTIALLY MAINTAINS ITS INTEGRITY AND THEREAFTER RECOVERING PETROLEUM FROM SAID PRODUCTION WELL.
References Cited (Backward Citations)
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US3047066A
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US3136361A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-08-14 | 1971-02-13 | 1971-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-14 | 1975-02-13 | 1975-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-14 | 1979-02-13 | 1979-08-15 | $7700.00 | Window Closed / Lapsed |