US2859818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of recovering petroleum
Assignee: Pan American Petroleum Corp
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Filing: 1956-08-20
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Granted: 1958-11-11
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Expires: 1976-08-20
Abstract
No abstract record available.
Inventors
- 👤 Howard N Hall
- 👤 Rue John W La
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:48
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/16; E21B43/17
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
A METHOD OF RECOVERING PETROLEUM FROM AN UNDERGROUND FORMATION HAVING IN COMMUNICATION THEREWITH A PLURALITY OF WELLS, SAID FORMATION HAVING A FIRST PERMEABLE FLOW CHANNEL IN THE LOWER PORTION THEREOF AND A SECOND PERMEABLE FLOW CHANNEL IN THE UPPER PORTION THEREOF, SAID FIRST PERMEABLE FLOW CHANNEL INCLUDING AT LEAST ONE FORMATION FRACTURE EXTENDING FROM AT LEAST ONE OF SAID WELLS SUBSTANTIALLY PARALLEL TO THE BOTTOM OF SAID FORMATION TOWARD AT LEAST ONE OF THE REMAINING WELLS, WHICH COMPRISES INJECTING A PETROLEUM SOLVENT INTO AT LEAST ONE OF SAID WELLS, AND INTO SAID SECOND PERMEABLE FLOW CHANNEL WHEREBY SAID SOLVENT CONTACTS SAID FORMATION BELOW SAID SECOND FLOW CHANNEL DILUTING RESIDUAL PETROLEUM THEREIN, PREVETING FLOW OF SAID SOLVENT THROUGH SAID SECOND FLOW CHANNEL DIRECTLY TO ANOTHER WELL, ALLOW-
Claim 2
Independent Claim
126 words
A METHOD OF RECOVERING PETROLEUM FROM AN UNDERGROUND FORMATION HAVING IN COMMUNICATION THEREWITH A PLURALITY OF WELLS, SAID FORMATION HAVING A FIRST PERMEABLE FLOW CHANNEL IN THE LOWER PORTION THEREOF AND A SECOND PERMEABLE FLOW CHANNEL IN THE UPPER PORTION THEREOF, SAID FIRST PERMEABLE FLOW CHANNEL INCLUDING AT LEAST ONE FORMATION FRACTURE EXTENDING FROM AT LEAST ONE OF SAID WELLS SUBSTANTIALLY PARALLEL TO THE BOTTOM OF SAID FORMATION TOWARD AT LEAST ONE OF THE REMAINING WELLS, WHICH COMPRISES INJECTING A PETROLEUM SOLVENT INTO AT LEAST ONE OF SAID WELLS, AND INTO SAID SECOND PERMEABLE FLOW CHANNEL WHEREBY SAID SOLVENT CONTACTS SAID FORMATION BELOW SAID SECOND FLOW CHANNEL DILUTING RESIDUAL PETROLEUM THEREIN, PREVETING FLOW OF SAID SOLVENT THROUGH SAID SECOND FLOW CHANNEL DIRECTLY TO ANOTHER WELL, ALLOW-
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) | 1961-11-10 | 1962-05-12 | 1962-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-10 | 1966-05-12 | 1966-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-10 | 1970-05-12 | 1970-11-11 | $7700.00 | Window Closed / Lapsed |