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US 4,378,839 AGranted
Well tool
AssigneeOtis Engineering Corporation
InventorErnest P. Fisher, Jr.
Life of this patent
Estimating the term…
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.
Claims11
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.
8 more elements
Dependencies are inferred from the claim text.