Patent US3256936A successfully refreshed from Google Patents.
US3256936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling underwater wells
Assignee: Shell USA Inc
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Filing: 1961-06-22
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Granted: 1966-06-21
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Expires: 1981-06-22
Abstract
No abstract record available.
Inventors
- 👤 Glenn D Johnson
- 👤 Bruce J Watkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:07
CPC Classifications
H; H05; H05K; H05K7/00; H05K7/14; E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/035; E21B41/00; E21B41/04; E21B7/00; E21B7/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
A METHOD OF DRILLING AN OFFSHORE WELL FROM AN OPERATIONAL PLATFORM POSITIONED ABOVE THE SURFACE OF A BODY OF WATER, SAID METHOD COMPRISING ASSEMBLIES A FOUNDATION ASSEMBLY, HAVING A VERTICAL OPENING THERETHROUGH, INSERTING A STRING OF SURFACE CASING INTO THE VERTICAL OPENING OF THE FOUNDATION ASSEMBLY, RELEASABLY CONNECTING TOGETHER THE LOWER END OF SAID SURFACE CASING AND SAID FOUNDATION ASSEMBLY, SUSPENDING SAID SURFACE CASING FROM SAID OPERATIONAL PLATFORM, INSERTING A DRILL STRING AND BIT THROUGH SAID SURFACE CASING, ROTATING SAID DRILL STRING AND BIT TO DRILL A HOLE IN THE OCEAN FLOOR OF A DIAMETER AND LENGTH TO RECEIVE AT LEAST THE LOWER PORTION OF SAID FOUNDATION ASSEMBLY, LOWERING SAID FOUNDATION ASSEMBLY SUPPORTED BY SAID SURFACE CASING AND CONNECTED THERETO ALONG SAID DRILL STRING AND INTO THE HOLE IN THE OCEAN FLOOR, AND CEMENTING THE FOUNDATION ASSEMBLY IN THE HOLE IN THE OCEAN FLOOR.
Claim 2
Independent Claim
144 words
A METHOD OF DRILLING AN OFFSHORE WELL FROM AN OPERATIONAL PLATFORM POSITIONED ABOVE THE SURFACE OF A BODY OF WATER, SAID METHOD COMPRISING ASSEMBLIES A FOUNDATION ASSEMBLY, HAVING A VERTICAL OPENING THERETHROUGH, INSERTING A STRING OF SURFACE CASING INTO THE VERTICAL OPENING OF THE FOUNDATION ASSEMBLY, RELEASABLY CONNECTING TOGETHER THE LOWER END OF SAID SURFACE CASING AND SAID FOUNDATION ASSEMBLY, SUSPENDING SAID SURFACE CASING FROM SAID OPERATIONAL PLATFORM, INSERTING A DRILL STRING AND BIT THROUGH SAID SURFACE CASING, ROTATING SAID DRILL STRING AND BIT TO DRILL A HOLE IN THE OCEAN FLOOR OF A DIAMETER AND LENGTH TO RECEIVE AT LEAST THE LOWER PORTION OF SAID FOUNDATION ASSEMBLY, LOWERING SAID FOUNDATION ASSEMBLY SUPPORTED BY SAID SURFACE CASING AND CONNECTED THERETO ALONG SAID DRILL STRING AND INTO THE HOLE IN THE OCEAN FLOOR, AND CEMENTING THE FOUNDATION ASSEMBLY IN THE HOLE IN THE OCEAN FLOOR.
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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) | 1969-06-20 | 1969-12-20 | 1970-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-20 | 1973-12-20 | 1974-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-20 | 1977-12-20 | 1978-06-21 | $7700.00 | Window Closed / Lapsed |