US4056145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic holddown for well packer stinger
Assignee: Dresser Industries Inc
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Filing: 1975-10-28
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Granted: 1977-11-01
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Expires: 1995-10-28
Abstract
Abstract Hydraulic locking means is provided in a dual stinger latching mechanism which hydraulic locking means secures tubular conduit within the packer latching mechanism against pressure below the packer tending to pump the conduit out. The hydraulic locking means utilizes the pressure below the packer to activate a gripping means on the conduit which is subject to the upward pressure force.
Inventors
- 👤 Marion Barney Jett
- 👤 Dennis Mitchel Spriggs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:28
CPC Classifications
E; E21; E21B; E21B23/00; E21B23/04; E21B23/042; E21B23/0418; E21B23/0422; E21B33/00; E21B33/10; E21B33/12; E21B33/122
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
89 words
A relatch stinger mechanism for multi-string well packers, comprising: body means having bore passage means therethrough adapted to receive a plurality of conduit strings telescopically therein; latch means in said body means for securing the remainder of the conduit strings in said body means when one conduit string is removed therefrom; and, hydraulic lock means in said body means communicating with pressure acting below the well packer and adapted to be engaged in response to said pressure into restraining abutment with a conduit string in said bore passage means.
Claim 2
Dependent Claim
89 words
A relatch stinger mechanism for multi-string well packers, comprising: body means having bore passage means therethrough adapted to receive a plurality of conduit strings telescopically therein; latch means in said body means for securing the remainder of the conduit strings in said body means when one conduit string is removed therefrom; and, hydraulic lock means in said body means communicating with pressure acting below the well packer and adapted to be engaged in response to said pressure into restraining abutment with a conduit string in said bore passage means.
Claim 3
Dependent Claim
42 words
The relatch stinger mechanism of claim 1 wherein said lock means comprises lateral sliding lock member means telescopically located in sealing slidable engagement in said body means and arranged for radial projecting into abutment with a conduit string in said bore passage.
Claim 4
Dependent Claim
40 words
The relatch stinger of claim 2 wherein said lock member means comprises a hydraulically actuated piston member having angled abutment surface means thereon adapted for wedging abutment with an angled surface on a conduit string in said bore passage means.
Claim 5
Dependent Claim
38 words
The relatch stinger of claim 3 wherein said surface means are angled to provide a restraining force against a conduit string in said bore passage means equal to or greater than the hydraulic buoyance of the conduit string.
Claim 6
Dependent Claim
24 words
The relatch stinger of claim 4 wherein said surface means comprises a plurality of transverse teeth across the abutment end of said piston member.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-31 | 1981-05-02 | 1981-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-31 | 1985-05-02 | 1985-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-31 | 1989-05-02 | 1989-11-01 | $7700.00 | Window Closed / Lapsed |