US3004602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Underwater oil well completion
Assignee: Richfield Oil Corp
•
Filing: 1956-11-05
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Granted: 1961-10-17
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Expires: 1976-11-05
Abstract
No abstract record available.
Inventors
- 👤 David C Kofahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:49
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/035
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
THE METHOD OF COMPLETION OF AN UNDERWATER WELL HAVING A SUBMERGED WELL HEAD STRUCTURE PROVIDED WITH A BLOWOUT PREVENTER, INCLUDING THE STEPS OF: LOWERING A CASTING STRING THROUGH THE WELL HEAD STRUCTURE AND BLOWOUT PREVENTER TO BRING A SHOULDER ON THE CASING STRING TO REST ON THE WELL HEAD STRUCTURE, SEPARATING AN UPPER PORTION OF THE CASING STRING FROM A REMAINING LOWER PORTION AT A LOCATION ABOVE SAID SHOULDER AND BELOW THE BLOWOUT PREVENTER, REMOVING THE UPPER PORTION OF THE CASING STRING, LOWERING A TUBING STRING THROUGH THE WELL HEAD STRUCTURE AND BLOWOUT PREVENTER INTO SAID REMAINING PORTION OF THE CASING STRING TO BRING A SHOULDER ON THE TUBING STRING TO REST ON THE TUBING HEAD, REMOVING THE BLOWOUT PREVENTER BY RAISING IT AXIALLY ALONG THE TUBING STRING, REMOVING AN UPPER PORTION OF THE TUBING STRING FROM A REMAINING PORTION PROJECTING ABOVE THE WELL HEAD STRUCTURE, AND IN-
Claim 2
Independent Claim
148 words
THE METHOD OF COMPLETION OF AN UNDERWATER WELL HAVING A SUBMERGED WELL HEAD STRUCTURE PROVIDED WITH A BLOWOUT PREVENTER, INCLUDING THE STEPS OF: LOWERING A CASTING STRING THROUGH THE WELL HEAD STRUCTURE AND BLOWOUT PREVENTER TO BRING A SHOULDER ON THE CASING STRING TO REST ON THE WELL HEAD STRUCTURE, SEPARATING AN UPPER PORTION OF THE CASING STRING FROM A REMAINING LOWER PORTION AT A LOCATION ABOVE SAID SHOULDER AND BELOW THE BLOWOUT PREVENTER, REMOVING THE UPPER PORTION OF THE CASING STRING, LOWERING A TUBING STRING THROUGH THE WELL HEAD STRUCTURE AND BLOWOUT PREVENTER INTO SAID REMAINING PORTION OF THE CASING STRING TO BRING A SHOULDER ON THE TUBING STRING TO REST ON THE TUBING HEAD, REMOVING THE BLOWOUT PREVENTER BY RAISING IT AXIALLY ALONG THE TUBING STRING, REMOVING AN UPPER PORTION OF THE TUBING STRING FROM A REMAINING PORTION PROJECTING ABOVE THE WELL HEAD STRUCTURE, AND IN-
References Cited (Backward Citations)
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US2241288A
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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) | 1964-10-16 | 1965-04-17 | 1965-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-16 | 1969-04-17 | 1969-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-16 | 1973-04-17 | 1973-10-17 | $7700.00 | Window Closed / Lapsed |