Patent US3332481A successfully refreshed from Google Patents.
US3332481A
Expired / Lapsed
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Method of installing submarine drilling and production head
Assignee: Richfield Oil Corp
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Filing: 1965-10-20
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Granted: 1967-07-25
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Expires: 1985-10-20
Abstract
No abstract record available.
Inventors
- 👤 Jr Charles E Wakefield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:35
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/035
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
IN A METHOD FOR INSTALLING A PRODUCTION HEAD AT A WELL DRILLED IN A FORMATION UNDERLYING A BODY OF WATER WHEREIN A SURFACE CASING HAS BEEN CEMENTED IN THE WELL, THE STEPS COMPRISING: HANGING THE LOWER PORTION OF A WATER SHUTOFF CASING INSIDE SAID SURFACE CASING, SECURING THE UPPER PORTION OF SAID WATER CASING TO THE LOWER END OF A PRODUCTION MANDREL, LOWERING SAID PRODUCTION MANDREL WITH SAID UPPER PORTION OF SAID WATER SHUTOFF CASING ONTO SAID WELL WHEREBY SAID UPPER PORTION OF SAID WATER SHUTOFF CASING ENGAGES SAID LOWER WATER SHUTOFF CASING PORTION,
Claim 2
Dependent Claim
94 words
IN A METHOD FOR INSTALLING A PRODUCTION HEAD AT A WELL DRILLED IN A FORMATION UNDERLYING A BODY OF WATER WHEREIN A SURFACE CASING HAS BEEN CEMENTED IN THE WELL, THE STEPS COMPRISING: HANGING THE LOWER PORTION OF A WATER SHUTOFF CASING INSIDE SAID SURFACE CASING, SECURING THE UPPER PORTION OF SAID WATER CASING TO THE LOWER END OF A PRODUCTION MANDREL, LOWERING SAID PRODUCTION MANDREL WITH SAID UPPER PORTION OF SAID WATER SHUTOFF CASING ONTO SAID WELL WHEREBY SAID UPPER PORTION OF SAID WATER SHUTOFF CASING ENGAGES SAID LOWER WATER SHUTOFF CASING PORTION,
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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) | 1970-07-24 | 1971-01-23 | 1971-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-24 | 1975-01-23 | 1975-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-24 | 1979-01-23 | 1979-07-25 | $7700.00 | Window Closed / Lapsed |