Patent US4457368A successfully refreshed from Google Patents.
US4457368A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shearable no go insert for a well lock
Assignee: Camco International Inc
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Filing: 1983-03-25
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Granted: 1984-07-03
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Expires: 2003-03-25
Abstract
Abstract An improved no go shoulder on a well lock which is adapted to lock in a locking notch in a landing nipple in a well in which the lock includes a setting wedge to be moved, after shearing setting shear means, for actuating locking dogs into the locking notch. The no go shoulder is of a shearable material having a shear strength load capacity greater than the shear strength capacity of the setting shear means but having a shear strength capacity less than the shear strength capacity of the landing nipple shoulder whereby the strength of the no go is sufficient to allow the lock to be set but is insufficient to deform the landing nipple shoulder. Preferably, the no go shoulder is a shearable insert positioned in a recess in the lock.
Inventors
- 👤 Jeffrey L. Knierimen
- 👤 Mark S. Fuller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:40
CPC Classifications
E; E21; E21B; E21B23/00; E21B23/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
121 words
In a well lock adapted to lock in a locking notch in a landing nipple in a well in which the lock includes a no go shoulder for contacting a landing nipple shoulder for allowing a setting wedge to be moved, after shearing setting shear means, for actuating locking dogs into the locking notch, the improvement in the no go shoulder comprising, said no go shoulder being of a shearable material having a shear strength load capacity greater than the shear strength load capacity of the setting shear means but less than the landing nipple shoulder whereby the strength of the no go is sufficient to allow the lock to be set but is insufficient to deform the landing nipple shoulder.
Claim 2
Dependent Claim
121 words
In a well lock adapted to lock in a locking notch in a landing nipple in a well in which the lock includes a no go shoulder for contacting a landing nipple shoulder for allowing a setting wedge to be moved, after shearing setting shear means, for actuating locking dogs into the locking notch, the improvement in the no go shoulder comprising, said no go shoulder being of a shearable material having a shear strength load capacity greater than the shear strength load capacity of the setting shear means but less than the landing nipple shoulder whereby the strength of the no go is sufficient to allow the lock to be set but is insufficient to deform the landing nipple shoulder.
Claim 3
Dependent Claim
20 words
The apparatus of claim 1 wherein the no go shoulder is an insert positioned in a recess in the lock.
Claim 4
Dependent Claim
13 words
The apparatus of claim 1 wherein the no go shoulder is a plastic.
Claim 5
Dependent Claim
150 words
In a well lock adapted to lock in a locking notch in a landing nipple in a well in which the lock includes a no go shoulder on the lock body for contacting a landing nipple shoulder for allowing a setting wedge to be moved, after shearing setting shear means, for actuating locking dogs outwardly into the locking notch, the improvement in the no go shoulder comprising, said no go shoulder being of a shearable insert positioned in the lock body and supported at each end and being of material having a shear strength load capacity greater than the shear means whereby the strength of the no go is sufficient to allow the lock to be set but is of a strength less than the nipple shoulder whereby the no go shoulder may be sheared without deforming the landing nipple shoulder thereby allowing the expanded dogs to hold the lock.
Claim 6
Dependent Claim
150 words
In a well lock adapted to lock in a locking notch in a landing nipple in a well in which the lock includes a no go shoulder on the lock body for contacting a landing nipple shoulder for allowing a setting wedge to be moved, after shearing setting shear means, for actuating locking dogs outwardly into the locking notch, the improvement in the no go shoulder comprising, said no go shoulder being of a shearable insert positioned in the lock body and supported at each end and being of material having a shear strength load capacity greater than the shear means whereby the strength of the no go is sufficient to allow the lock to be set but is of a strength less than the nipple shoulder whereby the no go shoulder may be sheared without deforming the landing nipple shoulder thereby allowing the expanded dogs to hold the lock.
Claim 7
Dependent Claim
34 words
The apparatus of claim 4 wherein the no go shoulder is an insert positioned in a recess in the lock with a space provided in the recess above the insert for receiving sheared materials.
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) | 1987-07-03 | 1988-01-02 | 1988-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-03 | 1992-01-02 | 1992-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-03 | 1996-01-02 | 1996-07-03 | $7700.00 | Window Closed / Lapsed |