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US 4,391,326 AGranted
Stinger assembly for oil well tool
AssigneeDresser Industries, Inc.
InventorDonald R. Greenlee
Life of this patent
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AssigneeDresser Industries, Inc.
InventorDonald R. Greenlee
Estimating the term…
A stinger assembly for use in releasably connecting an upper section of a tubing string to a tool in a well includes a mandrel with a master cam slot formed therein to define upper and lower support shoulders. An indexable collar telescoped on the mandrel includes a follower which fits within the slot so that as the mandrel is moved vertically, the follower rides within the slot indexing the collar between upper and lower positions relative to the mandrel. A collet is journaled on and carried by the collar and includes a plurality of radially flexible spring-fingers which in the lower position are blocked against deflecting radially inwardly and in the upper position are free to deflect inwardly into an annular recess on the mandrel. The upper shoulder in the master cam slot supports the follower so that the spring-fingers are in registry with the recess to allow the collet to be disconnected from the well tool.
A stinger assembly for use in releasably connecting an upper section of a tubing string to a tool in a well, said assembly including a mandrel having an upper end portion adapted for connection to the lower end of the upper section of the tubing string and a lower end portion for telescoping with the tool, an indexable collar telescoped onto said mandrel, connector means extending between said mandrel and said collar, a first shoulder on one of said mandrel and said collar for engagement by said connector means to support said collar in a first vertical position relative to said mandrel, a second shoulder on one of said mandrel and said collar for engagement by said connector means to support said collar in a second vertical position relative to said mandrel above said first position, a collet telescoped onto said mandrel and connected rotatably with said collar, said collet having a plurality of radially flexible spring-fingers for latching said stinger to the tool, a first surface on said mandrel to keep said fingers from deflecting radially inward, a second surface on said mandrel spaced radially inward from said first surface to allow said fingers to deflect radially inwardly for connecting with and disconnecting from the tool, and a cam surface on one of said mandrel and said collar for engagement by said connector means for indexing said collar from said first vertical position with said first surface in registery with spring-fingers into said second position with said second surface in registery with said spring-fingers by first moving said mandrel upwardly within the well.
A stinger assembly for use in releasably connecting an upper section of a tubing string to a tool in a well including a mandrel having a master cam slot therein defining upper and lower support shoulders, an indexable collar telescoped onto said mandrel, a follower connected to said collar and extending into said master cam slot, a collet journaled on said collar and having a plurality of radially flexible spring-fingers connected thereto for latching said mandrel to the tool, said mandrel having an outer surface for blocking said fingers from deflecting inwardly and a recess wherein said fingers are free to deflect radially inwardly for connecting to and releasing from the tool, said upper support shoulder locating said spring-fingers vertically in registery with said recess when engaging said follower.
Dependencies are inferred from the claim text.