Patent US3104707A successfully refreshed from Google Patents.
US3104707A
Expired / Lapsed
US
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Freeing pipe stuck in a borehole
Assignee: Jersey Production Research Co
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Filing: 1960-01-18
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Granted: 1963-09-24
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Expires: 1980-01-18
Abstract
No abstract record available.
Inventors
- 👤 Charles R Overly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:35
CPC Classifications
E; E21; E21B; E21B31/00; E21B31/03; E21B31/035
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
103 words
IN AN EARTH DRILLING OPERATION WHEREIN AN ANNULAR DRILL PIPE STRING IS POSITIONED IN A BOREHOLE BY A PIPE MANIPULATING DERRICK AND DRILLING FLUID IS CIRCULATED THROUGH THE PIPE STRING AND THE ANNULAR SPACE THEREAROUND, THE METHOD OF FACILITATING LIFTING OF THE PIPE STRING FROM THE BOREHOLE WITH THE DERRICK, COMPRISING: PUMPING A PRESSURIZED GASIFORM FLUID DOWN THE PIPE STRING TO DISPLACE DRILLING FLUID IN THE PIPE STRING; SEALING THE INTERIOR OF THE DRILL PIPE STRING AGAINST DRILLING FLUID FLOW INTO AND UP THE PIPE STRING FROM THE ANNULAR SPACE THEREAROUND; AND REDUCING THE PRESSURE OF THE GASIFORM FLUID IN THE PIPE STRING.
References Cited (Backward Citations)
US1774640A
Cited
US1867832A
Cited
US1903232A
Cited
US2726063A
Cited
US2808887A
Cited
US2865454A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-09-23 | 1967-03-25 | 1967-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-09-23 | 1971-03-25 | 1971-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-09-23 | 1975-03-25 | 1975-09-24 | $7700.00 | Window Closed / Lapsed |