US3942833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Running tools
Assignee: Individual
•
Filing: 1972-11-09
•
Granted: 1976-03-09
•
Expires: 1992-11-09
Abstract
Abstract A running tool for setting and retrieving well devices in and from wells having a mandrel reciprocable in its axial bore and slips suspended from the mandrel for reciprocation therewith into and out of supporting engagement with a well device, the bore including a counterbore in its lower portion permitting expansion of the slips into releasing position and a reduced lower extremity for contracting said slips into supporting position. A spring, confined in the counterbore around the mandrel, constantly urges said mandrel and slips downwardly and permits relative downward movement of the tool and expansion of the slips upon setting of the well device. A latch assembly is adapted to maintain the mandrel and slips in their relative upper positions upon slow lifting of the tool and is releasable upon rapid raising of said tool due to the inertia of said mandrel and slips combining with the compression of the spring to overcome the force of the latch assembly and permit upward movement of said tool relative to said mandrel and slips and reengagement of the slips with the well device. A safety lock may be provided to hold the latch assembly inoperative and prevent the inertia of the mandrel and slips from becoming effective.
Inventors
- 👤 Rowe A. Plunk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:04
CPC Classifications
E; E21; E21B; E21B23/00; E21B31/00; E21B31/12; E21B31/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
302 words
A running tool for setting and retrieving a well device comprising a tubular housing having a tapered portion at the lower end of its bore adapted to receive the upper end of said device, a mandrel reciprocable in said housing from a lower position to and above an upper position, slip means carried by said mandrel, said slip means being disposed in engagement with said tapered portion in gripping position when said mandrel is in its lower position and out of engagement with said tapered portion in release position when said mandrel is at or above said upper position, said mandrel being disposed above said upper position when tool is lowered fully, first spring means urging said mandrel toward said lower position, and latch means carried by said housing for selectively holding said mandrel in said upper position, said latch means comprising a latch portion moveable into and out of engagement with a downwardly facing shoulder on said mandrel, said latch portion being spaced below said shoulder when said mandrel is above said upper position, second spring means biasing said latch portion toward engagement with said shoulder, said second spring means having a predetermined strength sufficient to retain said latch portion in latching engagement with said shoulder upon slow upward movement of said housing whereby said housing, said mandrel, and said slip means may be moved upwardly together with said slip means latched in its upper release position, but said predetermined strength being insufficient to retain said latch portion in latching engagement with said shoulder upon rapid upward movement of said housing, whereby during said rapid upward movement, said latch portion rides outwardly over said shoulder due to the inertia of said mandrel, and said slip means is moved by said first spring means to its lower gripping position with said device.
Claim 2
Dependent Claim
302 words
A running tool for setting and retrieving a well device comprising a tubular housing having a tapered portion at the lower end of its bore adapted to receive the upper end of said device, a mandrel reciprocable in said housing from a lower position to and above an upper position, slip means carried by said mandrel, said slip means being disposed in engagement with said tapered portion in gripping position when said mandrel is in its lower position and out of engagement with said tapered portion in release position when said mandrel is at or above said upper position, said mandrel being disposed above said upper position when tool is lowered fully, first spring means urging said mandrel toward said lower position, and latch means carried by said housing for selectively holding said mandrel in said upper position, said latch means comprising a latch portion moveable into and out of engagement with a downwardly facing shoulder on said mandrel, said latch portion being spaced below said shoulder when said mandrel is above said upper position, second spring means biasing said latch portion toward engagement with said shoulder, said second spring means having a predetermined strength sufficient to retain said latch portion in latching engagement with said shoulder upon slow upward movement of said housing whereby said housing, said mandrel, and said slip means may be moved upwardly together with said slip means latched in its upper release position, but said predetermined strength being insufficient to retain said latch portion in latching engagement with said shoulder upon rapid upward movement of said housing, whereby during said rapid upward movement, said latch portion rides outwardly over said shoulder due to the inertia of said mandrel, and said slip means is moved by said first spring means to its lower gripping position with said device.
Claim 3
Dependent Claim
61 words
The running tool according to claim 1 wherein the interior of said tubular housing is enlarged to provide a counterbore having a downwardly facing shoulder at its upper end, the lower portion of said mandrel extending into the counterbore and having a radial flange thereon and said first spring means being confined on said mandrel between the shoulder and the flange.
Claim 4
Dependent Claim
53 words
The running tool according to claim 1 wherein said latch means comprises an arm extending axially of said housing and pivotally received in a channel in said housing, and said latch portion comprises an inwardly offset portion of said arm extending through an opening in said housing for selective engagement with said mandrel.
Claim 5
Dependent Claim
18 words
The running tool according to claim 3 wherein said second spring means is formed integrally with said arm.
References Cited (Backward Citations)
US1285523A
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US1795322A
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US2614881A
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US2745693A
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US2889170A
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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) | 1979-03-09 | 1979-09-08 | 1980-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-09 | 1983-09-08 | 1984-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-09 | 1987-09-08 | 1988-03-09 | $7700.00 | Window Closed / Lapsed |