DEVICE FOR REMOVING THE WHIPSTOCK FROM A HORIZONTAL SITE OF A MULTILATERAL WELL Russian patent published in 2018 - IPC E21B31/18 

FIELD: drilling soil or rock.

SUBSTANCE: invention relates to the field of drilling and workover of wells and can be used in the construction of sidetracks from the horizontal part of previously drilled and cased horizontal wells. Device includes a hole with a hook for a reciprocal sample of a whipstock connected to a pipe string. Hook is made in the form of a pipe segment that narrows from the barrel and is configured to interact when the pipe string is rotated about the axis with a sample of a whipstock, which is made in the form of a groove on its rear side with axial dimensions exceeding the size of the hook and angles corresponding to the hook angles. Trunk from above is equipped with a thickening with a diameter larger than the diameter of the sidetrack, and with the possibility of interacting with the upper end of the whipstock to combine the hook with the selection of the whipstock. Groove is made on the inner surface of the hook from the trunk to the apex. Barrel is provided with a channel with a tangential outlet combined with a hook groove to direct the flow of liquid from the stem to the top of the hook and a hydro-vibrator mounted above the bulge. Whipstock sample or the hook is equipped with a technological recess and a spring-loaded lock for a suitable technological recess of the sample of a whipstock or hook, which is configured to exit from the interaction with the deepening when the hook is moved downward relatively to the sample. Upper angle of the hook relative to the perpendicular plane of the device at the top of the hook is made equal to 5–10°, and the bottom corner – 20–50°.

EFFECT: reliability is increased, the operation of capturing the whipstock is facilitated and its hold, it becomes possible to detach the device from the wedge-deflector.

1 cl, 8 dwg