US3335792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for increasing oil recovery
Assignee: Union Oil Company of California
•
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 13:02
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)
US2053285A
Cited
US2866507A
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US3047066A
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US3136361A
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US3185634A
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US3196944A
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US3177939A
Cited
US3207217A
Cited
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 |