SELECTIVE AND NONSELECTIVE LAYOUT OF MOUNTING MANDREL WITH INNER SLEEVE DISPLACING UPWARDS Russian patent published in 2015 - IPC E21B23/02 

FIELD: mining.

SUBSTANCE: group of inventions relates to mining and can be used for mounting the mounting mandrel in the wellbore. The selective and nonselective layout of the mounting mandrel comprises a mounting mandrel attached to the running tool. The taper clamping sleeve on the tool secures the inner mandrel in a position closer to the bottom hole in the mounting mandrel. For nonselective layout the deviating dowel on the mounting mandrel enters into the profile of the pin, and the ledges on the dowel and the profile prevent the further descent into the well. The drillers cut the first shear pin on the running tool with the help of impact with jar down, and the taper clamping sleeve displaced and releases its fastening on the inner mandrel. The released inner mandrel, displaced with the spring, moves to a position closer to the wellhead, and the flange is located behind the forward based dowel to lock it in the profile. For the selective layout the deviating dowel is held diverted to activate using the setting ratchets on the running tool, coming into contact with the transition as it rise to the wellhead. After mounting the mounting mandrel the drillers disconnected the running tool from it.

EFFECT: increase of the reliability of operation of the mounting mandrel.

32 cl, 27 dwg