DOWNHOLE LANDING TOOL (VERSIONS) Russian patent published in 2019 - IPC E21B23/06 E21B31/18 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to production of oil and gas and can be used for movement, installation and extraction of well equipment. Borehole mounting tool comprises hollow housing with bore and ledge on inner cylinder, adapter and collet with inter-petal slots and collars on lobes for interaction with housing, barrel made with cylindrical ledge and guide cone and connected with adapter thread fixed with locking screw. In housing above bore there is internal thrust thread with direction opposite to thread screwing of downhole equipment. Collet is located on the shaft with possibility of longitudinal displacement restricted with an adapter. Collars on ends of petals of collet are made with thrust thread interacting with thrust thread of housing, and with inner chamfer interacting with cone made on upper part of protrusion of barrel, for expansion and reinforcement of engagement of threaded collars of collet for internal thrust thread of housing at lifting of downhole equipment. In the first version, the middle part of the barrel is made cone-shaped, providing compression of threaded collars of the collet when they pass into the internal thread of the housing until the protrusion of the barrel protrudes into the shoulder of the inner cylinder of the housing when landing the downhole equipment and engaging the threaded collars of the collet for the threaded thread of the housing, wherein barrel-like surface of the barrel has key ledges arranged in inter-petal grooves of collet to hold the collet from turning on the barrel while screwing the barrel with the adapter assembly from the case by rotating them in the opposite direction to screwing down the well equipment when removing them from the well. In compliance with second version threaded collars with collet lugs are arranged in lengthwise slots made in middle part of barrel with outlet to cone of protrusion of barrel and slope increasing depth of groove in direction of cone, which provides for compression of threaded collars of collet when they pass into internal thread of case. Thrust threads on collars of petals of collet and inside housing are made with trapezoidal profile.

EFFECT: higher reliability of downhole landing tools.

5 cl, 3 dwg