Patent US3294167A successfully refreshed from Google Patents.
US3294167A
Expired / Lapsed
US
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Thermal oil recovery
Assignee: Shell USA Inc
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Filing: 1964-04-13
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Granted: 1966-12-27
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Expires: 1984-04-13
Abstract
No abstract record available.
Inventors
- 👤 John V Vogel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:37
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/16; E21B43/24
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
117 words
A METHOD OF RECOVERING HYDROCARBONS FROM A SUBSURFACE FORMATION WHICH COMPRISES THE STEPS OF PROVIDING COMMUNICATION THROUGH A WELL BETWEEN THE SURFACE OF THE EARTH AND A FIRST SUBSURFACE FORMATION FROM WHICH HYDROCARBONS HAVE BEEN RECENTLY RECOVERED BY A COMPLETED THERMAL RECOVERY METHOD WHEREBY SAID FORMATION RETAINS A SUBSTANTIAL AMOUNT OF HEAT, PROVIDING COMMUNICATION BETWEEN SAID HEAT-CONTAINING FIRST SUBSURFACE FORMATION AND A SECOND SUBSURFACE FORMATION CONTAINING HYDROCARBONS AT LEAST A PORTION OF SAID COMMUNICATION BEING PROVIDED THROUGH A WELL, FORCING FLUID FROM THE SURFACE OF THE EARTH DOWN TO, INTO AND OUT OF SAID HEAT-CONTAINING FIRST SUBSURFACE FORMATION, SAID FLUID HAVING A TEMPERATURE LESS THAN THAT OF SAID HEAT-CONTAINING FORMATION AT THE TIME IT IS FORCED THEREINTO,
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) | 1969-12-26 | 1970-06-27 | 1970-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-26 | 1974-06-27 | 1974-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-26 | 1978-06-27 | 1978-12-27 | $7700.00 | Window Closed / Lapsed |