US2821255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Subformation oil production method
Assignee: Individual
•
Filing: 1956-03-30
•
Granted: 1958-01-28
•
Expires: 1976-03-30
Abstract
No abstract record available.
Inventors
- 👤 Spearow Ralph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:19
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/16; E21B43/166; E21B43/168; E21B43/18; E21B43/25; E21B43/26; E21B43/2605
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
A METHOD OF PRODUCING OIL FROM OIL HORIZONS HAVING AT LEAST SOME OF THE ORIGINAL FORMATION PRESSURE STILL RESIDENT THEREIN COMPRISING THE STEPS OF DRILLING THE BOREHOLE OF A PRODUCTION WELL BELOW THE BOTTOM LEVEL OF THE OIL HORIZON TO BE PRODUCED RUNNING A PRODUCTION CHANNEL TO THE VINCINITY OF THE BOTTOM OF THE HOLE BORE AND BELOW THE BOTTOM OF THE OIL HORIZON TO BE PRODUCED, SEALING SAID PRODUCTION CHANNEL TO THE WELL WALL TO PRODUCE AN ANNULAR SEAL FROM A LEVEL BELOW THE BOTTOM OF THE OIL HORIZON TO A LEVEL ABOVE THE TOP THEREOF, FORMING AT LEAST ONE OPEN PASSAGEWAY THROUGH THE EARTH FORMATIONS EXTENDING FROM A LEVEL BELOW THE HORIZON AND WITHIN THE WELL BORE UPWARDLY INTO THE BOTTOM OF THE OIL HORIZON, PRODUCING
Claim 2
Independent Claim
128 words
A METHOD OF PRODUCING OIL FROM OIL HORIZONS HAVING AT LEAST SOME OF THE ORIGINAL FORMATION PRESSURE STILL RESIDENT THEREIN COMPRISING THE STEPS OF DRILLING THE BOREHOLE OF A PRODUCTION WELL BELOW THE BOTTOM LEVEL OF THE OIL HORIZON TO BE PRODUCED RUNNING A PRODUCTION CHANNEL TO THE VINCINITY OF THE BOTTOM OF THE HOLE BORE AND BELOW THE BOTTOM OF THE OIL HORIZON TO BE PRODUCED, SEALING SAID PRODUCTION CHANNEL TO THE WELL WALL TO PRODUCE AN ANNULAR SEAL FROM A LEVEL BELOW THE BOTTOM OF THE OIL HORIZON TO A LEVEL ABOVE THE TOP THEREOF, FORMING AT LEAST ONE OPEN PASSAGEWAY THROUGH THE EARTH FORMATIONS EXTENDING FROM A LEVEL BELOW THE HORIZON AND WITHIN THE WELL BORE UPWARDLY INTO THE BOTTOM OF THE OIL HORIZON, PRODUCING
References Cited (Backward Citations)
US2404341A
Cited
US2754911A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-27 | 1961-07-29 | 1962-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-27 | 1965-07-29 | 1966-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-27 | 1969-07-29 | 1970-01-28 | $7700.00 | Window Closed / Lapsed |