Patent US3333637A successfully refreshed from Google Patents.
US3333637A
Expired / Lapsed
US
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Petroleum recovery by gas-cock thermal backflow
Assignee: Shell USA Inc
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Filing: 1964-12-28
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Granted: 1967-08-01
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Expires: 1984-12-28
Abstract
No abstract record available.
Inventors
- 👤 Prats Michael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:55
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/16; E21B43/164; E21B43/24; Y; Y02; Y02P; Y02P90/00; Y02P90/70
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
A METHOD OF RECOVERING PETROLEUM FROM SUBTERRANEANS RESERVOIRS WHICH COMPRISES THE STEPS OF: (A) PENETRATING A PERMEABLE PETROLEUM PRODUCING RESERVOIR WITH A BOREHOLE; (B) INJECTING THROUGH SAID BOREHOLE INTO SAID RESERVOIR A SLUG OF A NON-CONDENSABLE GAS; (C) SUBSEQUENTLY INJECTING THROUGH SAID BOREHOLE INTO SAID RESERVOIR A HEATED FLUID HAVING A TEMPERATURE SUFFICIENT TO INCREASE THE MOBILITY OF THE RESERVOIR PETROLEUM; (D) TERMINATING SAID INJECTION OF HEATED FLUID;
Claim 2
Independent Claim
68 words
A METHOD OF RECOVERING PETROLEUM FROM SUBTERRANEANS RESERVOIRS WHICH COMPRISES THE STEPS OF: (A) PENETRATING A PERMEABLE PETROLEUM PRODUCING RESERVOIR WITH A BOREHOLE; (B) INJECTING THROUGH SAID BOREHOLE INTO SAID RESERVOIR A SLUG OF A NON-CONDENSABLE GAS; (C) SUBSEQUENTLY INJECTING THROUGH SAID BOREHOLE INTO SAID RESERVOIR A HEATED FLUID HAVING A TEMPERATURE SUFFICIENT TO INCREASE THE MOBILITY OF THE RESERVOIR PETROLEUM; (D) TERMINATING SAID INJECTION OF HEATED FLUID;
References Cited (Backward Citations)
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Cited
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Cited
US3136361A
Cited
US3155160A
Cited
US3100528A
Cited
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Cited
US3259186A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-31 | 1971-01-30 | 1971-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-31 | 1975-01-30 | 1975-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-31 | 1979-01-30 | 1979-08-01 | $7700.00 | Window Closed / Lapsed |