Patent US2952450A successfully refreshed from Google Patents.
US2952450A
Expired / Lapsed
US
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In situ exploitation of lignite using steam
Assignee: Phillips Petroleum Co
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Filing: 1959-04-30
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Granted: 1960-09-13
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Expires: 1979-04-30
Abstract
No abstract record available.
Inventors
- 👤 Purre Heino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:09
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/16; E21B43/24; E21B43/2405; E21B43/25; E21B43/26; E21B43/2605
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
A PROCESS FOR RECOVERING HYDROCARBONS FROM A SUBTERRANEAN LIGNITE STRATUM WHICH COMPRISES INJECTING STREAM AT A TEMPERATURE OF AT LEAST 400*F. INTO SAID STRATUM THRU A WELL THEREIN AT SUFFICIENT PRESSURE TO FRACTURE SAID STRATUM, CONTINUING STEAM INJECTION UNTIL A SUBSTANTIAL ANNULUS AROUND SAID WELL IS HEATED TO SUBSTANTIALLY THE STEAM TEMPERATURE, THEREAFTER, SUDDENLY RELEASING THE STEAM PRESSURE IN SAID WELL WHEREBY SHATTERING OF SAID STRATUM IS EFFECTED BY FLASH VAPORIZING OF LIQUID THEREIN AND HYDROCARBONS RELEASED BY THE HEATING OF SAID ANNULUS FLOW INTO SAID WELL, AND RECOVERING SAID HYDROCARBONS FROM SAID WELL.
Claim 2
Dependent Claim
94 words
A PROCESS FOR RECOVERING HYDROCARBONS FROM A SUBTERRANEAN LIGNITE STRATUM WHICH COMPRISES INJECTING STREAM AT A TEMPERATURE OF AT LEAST 400*F. INTO SAID STRATUM THRU A WELL THEREIN AT SUFFICIENT PRESSURE TO FRACTURE SAID STRATUM, CONTINUING STEAM INJECTION UNTIL A SUBSTANTIAL ANNULUS AROUND SAID WELL IS HEATED TO SUBSTANTIALLY THE STEAM TEMPERATURE, THEREAFTER, SUDDENLY RELEASING THE STEAM PRESSURE IN SAID WELL WHEREBY SHATTERING OF SAID STRATUM IS EFFECTED BY FLASH VAPORIZING OF LIQUID THEREIN AND HYDROCARBONS RELEASED BY THE HEATING OF SAID ANNULUS FLOW INTO SAID WELL, AND RECOVERING SAID HYDROCARBONS FROM SAID WELL.
References Cited (Backward Citations)
GB716620A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-13 | 1964-03-14 | 1964-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-13 | 1968-03-14 | 1968-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-13 | 1972-03-14 | 1972-09-13 | $7700.00 | Window Closed / Lapsed |