MULTIPLE TIMES INSTALLED PRE-INSTALLED MECHANISM FOR WELL TOOLS Russian patent published in 2019 - IPC E21B23/06 E21B33/129 

FIELD: mining.

SUBSTANCE: downhole tool for use in an underground well with a casing in it. Downhole tool has a mandrel, a wedge, a slip block of dies and a pre-set mechanism. Wedge is located near the mandrel and operates with the possibility of sliding relative to the mandrel in such a way that the wedge can slide between an unspecified position and an established position. Slip block dies associated with the wedge in such a way that when slip type wedge is in an unspecified position, slip type block dies is in a radial position inside and does not engage with the casing, and when the slip type wedge is in the installed position, the slip type block of the dies is in the radial position from the outside and engages with the casing. Preset mechanism has a first locking ring located between the first wedge and the mandrel and placed at least partially in the groove in the mandrel. Locking ring prevents the wedge from moving from an unstated position to a fixed position until the load on the mandrel exceeds a predetermined force.

EFFECT: technical result consists in improvement of efficiency of the downhole tool.

20 cl, 26 dwg