US4378839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well tool
Assignee: Otis Engineering Corp
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Filing: 1981-03-30
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Granted: 1983-04-05
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Expires: 2001-03-30
Abstract
Abstract A subsurface safety valve is combined with a locating means for locating the safety valve as it is pumped down into the well. A locking mandrel is provided that locks the safety valve in position after it has been located by a downward force being exerted on the locking means. When it is desired to remove the subsurface safety valve a pulling tool is run in and a downward force exerted to release the locking means permitting it thereafter to be retrieved from the well by reverse circulation.
Inventors
- 👤 Ernest P. Fisher, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:47
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/10; E21B34/105; E21B23/00; E21B23/02; E21B23/08
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
165 words
A locking mandrel comprising: a body; locking dogs carried by the body and extensible radially to lock the mandrel in a landing nipple; prop-out means slidable in the body between an upper out-of-the-way position permitting the dogs to retract, an intermediate position propping said dogs in extended position, and a lower out-of-the-way position permitting said dogs to retract; a setting sleeve movable downwardly from an upper running position to a lower setting position and moving said prop-out means from its upper out-of-the-way position to its intermediate dog extending position; means between said body and said setting sleeve preventing movement of said setting sleeve below said lower setting position; a release sleeve carried by said prop-out means and movable from an upper position to a lower position and moving said prop-out means to its lower out-of-the-way position to release said dogs; means releasably securing said setting sleeve to said body in its upper running position; and means releasably securing said release sleeve to said setting sleeve.
Claim 2
Dependent Claim
165 words
A locking mandrel comprising: a body; locking dogs carried by the body and extensible radially to lock the mandrel in a landing nipple; prop-out means slidable in the body between an upper out-of-the-way position permitting the dogs to retract, an intermediate position propping said dogs in extended position, and a lower out-of-the-way position permitting said dogs to retract; a setting sleeve movable downwardly from an upper running position to a lower setting position and moving said prop-out means from its upper out-of-the-way position to its intermediate dog extending position; means between said body and said setting sleeve preventing movement of said setting sleeve below said lower setting position; a release sleeve carried by said prop-out means and movable from an upper position to a lower position and moving said prop-out means to its lower out-of-the-way position to release said dogs; means releasably securing said setting sleeve to said body in its upper running position; and means releasably securing said release sleeve to said setting sleeve.
Claim 3
Dependent Claim
35 words
The locking mandrel of claim 1 wherein means are provided for positively releasably holding said prop-out means against upward movement while in said intermediate position and non-releasably locking said prop-out means in said lower position.
Claim 4
Dependent Claim
69 words
The locking mandrel of claims 1 or 2 wherein a running collet providing a part of a knuckle joint is held in contracted position while the setting sleeve is in its upper running position and is released to expand with movement of the setting sleeve to its lower setting position; said collect when expanded providing means releasably holding said prop-out means against upward movement while in said intermediate position.
Claim 5
Dependent Claim
52 words
The locking mandrel of claim 3 in combination with a subsurface safety valve which will bypass fluid under pressure from above the safety valve to permit a pulling tool to be pumped into engagement with the locking mandrel and release the locking mandrel by moving said releasing sleeve to said lower position.
Claim 6
Dependent Claim
28 words
The locking mandrel of claim 3 wherein the means releasably holding the prop-out means in each of said upper and intermediate positions includes shear means in each position.
Claim 7
Dependent Claim
127 words
The locking mandrel of claims 1 or 2 wherein a running collet providing a part of a knuckle joint is held in contracted position while the setting sleeve is in its upper running position and is released to expand with movement of the setting sleeve to its lower setting position, said collet when expanded providing means releasably holding said prop-out means against upward movement while in said intermediate position, said running collet providing an upwardly facing shoulder to be engaged and moved downwardly by a pulling tool and when moved downwardly shifting said release sleeve from said upper position to its lower position to move said prop-out means to its lower out-of-the-way position to release said dogs, and means releasably securing said running collet to said body.
Claim 8
Dependent Claim
52 words
The locking mandrel of claim 6 in combination with a subsurface safety valve which will bypass fluid under pressure from above the safety valve to permit a pulling tool to be pumped into engagement with the locking mandrel and release the locking mandrel by moving said releasing sleeve to said lower position.
Claim 9
Dependent Claim
28 words
The locking mandrel of claim 6 wherein the means releasably holding the prop-out means in each of said upper and intermediate positions includes shear means in each position.
Claim 10
Dependent Claim
54 words
The locking mandrel of claims 1, or 2 in combination with a subsurface safety valve which will bypass fluid under pressure from above the safety valve to permit a pulling tool to be pumped into engagement with the locking mandrel and release the locking mandrel by moving said releasing sleeve to said lower position.
Claim 11
Dependent Claim
28 words
The locking mandrel of claim 9 wherein the means releasably holding the prop-out means in each of said upper and intermediate positions includes shear means in each position.
Claim 12
Dependent Claim
30 words
The locking mandrel of claims 1, or 2 wherein the means releasably holding the prop-out means in each of said upper and intermediate positions includes shear means in each position.
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) | 1986-04-04 | 1986-10-04 | 1987-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-04 | 1990-10-04 | 1991-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-04 | 1994-10-04 | 1995-04-05 | $7700.00 | Window Closed / Lapsed |