Patent US3662823A successfully refreshed from Google Patents.
US3662823A
Expired / Lapsed
US
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Replacement of sub-sea blow-out preventer packing units
Assignee: Hydril LLC
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Filing: 1970-07-31
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Granted: 1972-05-16
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Expires: 1990-07-31
Abstract
Abstract A method of retrieving a blow-out preventer packer from a blowout preventer body at a sub-sea well head location includes the steps: A. ELEVATING, RELATIVE TO THE BODY, A PACKER HOLDDOWN MEANS TO VERTICALLY EXPOSE THE PACKER FOR REMOVAL, IN THE SEA, B. MOVING A PACKER RETRIEVAL TOOL LATERALLY AND DOWNWARDLY TO PENETRATE THE BODY, AND EFFECTING LIFTING ATTACHMENT OF THE TOOL TO THE PACKER, AND C. MOVING SAID TOOL WITH THE PACKER ATTACHED THERETO UPWARDLY AND LATERALLY IN THE SEA TO LIFT THE PACKER OUT OF VERTICAL ALIGNMENT WITH THE BODY, FOR SUBSEQUENT ELEVATION OF THE PACKER TO THE SURFACE.
Inventors
- 👤 Fernando Murman
- 👤 George E Lewis
- 👤 Allen I Dunn
- 👤 Charles E O'brien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:37
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/06; E21B33/064; E21B33/035
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
117 words
The method of retrieving a blow-out preventer packer from a blow-out preventer body at a sub-sea well head location, there being hold-down means attached to the body and extending directly above the packer, said method including: a. elevating said hold-down means in the sea relative to the body to vertically expose the packer for removal, b. moving a packer retrieval tool laterally and downwardly in the sea to penetrate the body and effecting lifting attachment of the tool to the packer; and c. moving said tool with the packer attached thereto upwardly and laterally in the sea to lift the packer out of vertical alignment with the body, for subsequent elevation of the packer to the surface.
Claim 2
Independent Claim
117 words
The method of retrieving a blow-out preventer packer from a blow-out preventer body at a sub-sea well head location, there being hold-down means attached to the body and extending directly above the packer, said method including: a. elevating said hold-down means in the sea relative to the body to vertically expose the packer for removal, b. moving a packer retrieval tool laterally and downwardly in the sea to penetrate the body and effecting lifting attachment of the tool to the packer; and c. moving said tool with the packer attached thereto upwardly and laterally in the sea to lift the packer out of vertical alignment with the body, for subsequent elevation of the packer to the surface.
Claim 3
Dependent Claim
18 words
The method of claim 1 wherein said lifting attachment of the tool to the packer is magnetically effected.
Claim 4
Dependent Claim
18 words
The method of claim 1 wherein said lifting attachment of the tool to the packer is mechanically effected.
Claim 5
Dependent Claim
30 words
The method of claim 1 wherein said elevation of the hold-down means is effected by lifting a tubular riser to the lower end of which said hold-down means is attached.
Claim 6
Dependent Claim
75 words
The method of claim 1 including the further steps of lowering a replacement packer and said tool in the sea to a location proximate said body from which the original packer has been retrieved, moving said tool with the replacement packer attached thereto laterally and downwardly to penetrate said body, detaching the packer from said tool, removing said tool upwardly and laterally from the body, and lowering said hold-down means for attachment to the body.
Claim 7
Dependent Claim
28 words
The method of claim 1 including the preliminary step of closing the well at a level below the packer to block the well against communication with the sea.
References Cited (Backward Citations)
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US2846178A
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US3023012A
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US3222075A
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US3225831A
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US3561723A
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US3533468A
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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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |