Patent US2862304A successfully refreshed from Google Patents.
US3587733A
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Method of rotatably releasing a tubular running string from a floating drilling vessel
Assignee: Vetco Inc
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Filing: 1968-11-01
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Granted: 1971-06-28
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Expires: 1988-11-01
Abstract
Abstract CASING IS RUN IN A WELL UNDERLYING THE OCEAN FROM A FLOATING VESSEL BY A TUBULAR RUNNING STRING ATTACHED TO A CASING HANGER BY LEFT-HAND THREADS. THE CASING HANGER IS LANDED IN A HANGER BODY FIXED TO THE OCEAN FLOOR AND LOCKED IN PLACE. THE CASING IS THEN CEMENTED IN PLACE, WHEREUPON THE RUNNING STRING IS ROTATED WHILE APPLYING FLUID PRESSURE TO ITS INTERIOR, WHICH EXERTS A LIFTING FORCE AT THE TOP OF THE RUNNING STRING AND SUPPORTS A MAJOR PORTION OF ITS WEIGHT THEREBY RELIEVING THE HEAT THREADS OF SUCH WEIGHT AND OF THE ACCOMPANYING FRICTION. THIS FACILITATES COMPLETE UNTHREADING OF THE RUNNING STRING FROM THE CASING HANGER.
Inventors
- 👤 William F Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:11
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/04; E21B33/043
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |