DEVICE FOR EXTRACTING THE WELDING WIRE FROM A WELL Russian patent published in 2018 - IPC E21B31/20 

FIELD: oil and gas industry.

SUBSTANCE: invention is related to the area of drilling and workover of oil and gas wells and may be used during construction of multi-hole wells and sidetracks from previously drilled wells. Device includes a barrel with a hook for a reciprocal sample of a wedge-deflector connected to a string of pipes. Hook is made in the form of a segment of a pipe made to interact with the rotation of the pipe string around the axis with the selection of a wedge-deflector in the form of a cylindrical groove on its rear side. Barrel is made of assembled from the outer and inner parts, co-axially inserted into each other with the possibility of limited axial extension with the overcoming of the force of the spring, located between them. For synchronous rotation of the barrel parts when the hook is inserted into the sample of the wedge-deflector on the cooperating ends of the outer and inner parts of the trunk, one-sided inclined projections and the corresponding one-sided inclined slots, which are made to be disengaged when the trunk portions are expanded. Slope of the protrusions and grooves is formed so that, when the axial force of the spring and the weight of the pipe string interact, the outer part of the barrel with the hook disengages from the selection of the wedge-deflector. Trunk from above is equipped with a thickening made with a diameter larger than the diameter of the sidetrack, and with the possibility of interaction with the upper end of the wedge-deflector to combine the hook with the selection of the wedge-deflector.

EFFECT: reliability increases, the strength of the wedge-deflector increases and the operation of its extraction is facilitated, emergency situations are eliminated.

1 cl, 8 dwg