| 摘要 |
A downhole running tool for positioning and locking tool support mandrels within landing nipples of the production tubing string of a well. A housing is provided which forms an internal receptacle receiving upper and lower core sections forming an elongated core which is telescopically movable to collapsed and extended positions defined by spaced stops formed by the housing. A portion of the core extends from the housing for connection with a tool support mandrel. A collet type releasable retainer secures locking lugs of the housing in a substantially fixed position within the internal receptacle and is movable to a lug release position upon contact with the landing nipple during upward movement of the downhole running tool to thus permit spring urged movement of the core to force the mandrel from its retracted position to its locating position. Complete collapsing telescopic movement of the housing relative to the elongated core is cushioned by the core urging spring to protect the mandrel and its wall tool from excessive jarring. A shear pin is sheared by downward jarring action of the housing relative to the core to thus release the core for full collapsing telescoping movement within the internal receptacle. During such movement a second shear pin is sheared to provide positive indication that the tool support mandrel has been placed in its fully locked position. Full collapsing of the core also retracts locking lug members from locking position within the fishing neck of the mandrel and permits separation of the core from the mandrel upon shearing of a third shear pin.
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