US3216512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well drilling
Assignee: GAS DRILLING SERVICE CO
•
Filing: 1961-03-10
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Granted: 1965-11-09
•
Expires: 1981-03-10
Abstract
No abstract record available.
Inventors
- 👤 Donovan B Grable
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:31
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/01
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
130 words
THE METHOD THAT INCLUDES, LOWERING IN A WELL BORE A PIPE STRING INCLUDING ANNULARLY SPACED INNER AND OUTER PIPES DEFINING BETWEEN THEM A FLUD INJECTION PASSAGE HAVING AN OUTLET AT THE BOTTOM OF THE STRING, DRILLING THE CENTRAL BOTTOM OF THE HOLE INDEPENDENTLY OF SAID STRING AND REDUCING THE DRILLED FORMATION TO POWDERY CONSISTENCY, PROGRESSIVELY SUPPORTING THE SIDE WALL FORMATION OF THE BORE BY SAID PIPE STRING, AND CIRCULATING HIGH VELOCITY COMPRESSED AIR THROUGH SAID PASSAGE INTO THE BOTTOM OF THE BORE, JETTING SAID COMPRESSED AIR TO FLOW INWARDLY IN THE REACH OF OPERATION OF AN OPERATING DRILL BIT AT THE HOLE BOTTOM SO AS TO SWEEP ACROSS THE BOTTOM OF THE HOLE TO ENTRAIN AND REMOVE CUTTINGS THROUGH THE INNER PIPE OF THE PIPE STRING TO THE GROUND SURFACE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-08 | 1969-05-10 | 1969-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-08 | 1973-05-10 | 1973-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-08 | 1977-05-10 | 1977-11-09 | $7700.00 | Window Closed / Lapsed |