Patent US3236307A successfully refreshed from Google Patents.
US3236307A
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Method and apparatus for releasing wall-stuck pipe
Assignee: Baker Hughes Holdings LLC
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Filing: 1962-01-11
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Granted: 1966-02-22
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Expires: 1982-01-11
Abstract
No abstract record available.
Inventors
- 👤 Cicero C Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:28
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/12; E21B33/127; E21B31/00; E21B31/03; E21B31/035; E21B31/107
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
THE METHOD OF RELEASING WALL-STUCK PIPE IN A WELL, COMPRISING, REMOVING THE FREE PORTION OF THE PIPE, PLACING MEANS IN THE WELL BORE TO FORM AND SEAL OFF AN ANNULUS THEREIN ABOVE THE STUCK POINT, CONNECTING SAID SEAL-FORMING MEANS TO THE WALL-STUCK PORTION OF THE PIPE, ESTABLISHING CIRCULATION OF A FLUID BETWEEN THE INTERIOR OF THE STUCK PIPE AND THE WELL ANNULUS ABOVE THE STUCK POINT TO THEREBY ESTABLISH SEPARATE UPWARDLY AND DOWNWARDLY MOVING COLUMNS OF SAID FLUID, AND ABRUPTLY INTERRUPTING THE MOVEMENT OF THE DOWNWARDLY MOVING COLUMN OF FLUID WHEREBY TO GENERATE A HIGH ENERGY DOWNWARD JAR DIRECTED AGAINST SAID PIPE TO RELEASE THE SAME.
Claim 2
Independent Claim
106 words
THE METHOD OF RELEASING WALL-STUCK PIPE IN A WELL, COMPRISING, REMOVING THE FREE PORTION OF THE PIPE, PLACING MEANS IN THE WELL BORE TO FORM AND SEAL OFF AN ANNULUS THEREIN ABOVE THE STUCK POINT, CONNECTING SAID SEAL-FORMING MEANS TO THE WALL-STUCK PORTION OF THE PIPE, ESTABLISHING CIRCULATION OF A FLUID BETWEEN THE INTERIOR OF THE STUCK PIPE AND THE WELL ANNULUS ABOVE THE STUCK POINT TO THEREBY ESTABLISH SEPARATE UPWARDLY AND DOWNWARDLY MOVING COLUMNS OF SAID FLUID, AND ABRUPTLY INTERRUPTING THE MOVEMENT OF THE DOWNWARDLY MOVING COLUMN OF FLUID WHEREBY TO GENERATE A HIGH ENERGY DOWNWARD JAR DIRECTED AGAINST SAID PIPE TO RELEASE THE SAME.
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) | 1969-02-21 | 1969-08-23 | 1970-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-21 | 1973-08-23 | 1974-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-21 | 1977-08-23 | 1978-02-22 | $7700.00 | Window Closed / Lapsed |