WELL SIDE HOLE RE-ENTRY DEVICE Russian patent published in 2019 - IPC E21B7/08 

FIELD: drilling soil or rock.

SUBSTANCE: invention relates to the field of the oil and gas wells drilling, maintenance and overhaul. Device includes lowered on the pipe string housing with a guide surface from above, and an actuating element capable of moving in the housing between the transport position and the locking position and having a surface at the upper end for engagement with encountered in the casing string obstacles. Housing guide surface is configured to interact with the drilling tool after the housing installation in the casing string. Housing is equipped with directed upwards from the center to the housing perimeter the guide channel, and below the actuator is with the longitudinal upper cylinder, from below communicated with the pipes string. In the cylinder a piston is inserted with possibility of the limited upward movement, from above connected to the actuating element by the movable tie-rod, which in the transport position is inserted into the guide channel flush with the housing and is made with possibility of the longitudinal movement along the guide channel with extension with the pressure build-up in the upper cylinder and by its surface at the upper end hooking with the previously opened in the casing string window lower edge. Below the upper cylinder the housing is equipped with the smaller diameter rod, at which end the piston is fixed, inserted into the movable cylinder, by the hydraulic channel communicated with the upper cylinder bottom and installed with possibility of movement upward relative to the housing under the action of overpressure with fixation in the upper position. Between the movable cylinder upper end and the housing lower end, an elastic cuff is installed on the rod, which is made with possibility of expansion and the downhole space sealing during the movable cylinder moving upwards.

EFFECT: enabling the device complete extraction without the main wellbore bore reduction and its use simplification.

1 cl, 4 dwg