DEVICE FOR WITHDRAWAL OF DOUBLE-SIDED DEFLECTING WEDGE FROM WELL Russian patent published in 2014 - IPC E21B31/12 

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 downhole splitters. The device comprises the main bore with catching hook and top joint for pipe string. The joint features diameter larger than that of additional drilled bores and is fitted with extra bore similar to the main one with catching hook directed towards the catching hook of the main bore. The main and additional bores are hollow and elastic and equipped with radial flushing channels arranged above catching hooks and aligned therewith. Above the joints there is a piston covered from outside by downwards spring-actuated cylinder fixed in the upper position, which is capable to move downwards and fix the bores from outside. In the lower part of the piston there are process plates with holes, and a thrust is placed between the latter in the lower position so that it is capable of limited movement upwards without slipping at interaction with the upper end of the deflecting edge. The cylinder features a circular groove with bevels interacting with balls in holes of the process plates pressed from inside by the thrust; in the thrust below holes there is mortising overlapping the holes in plates when the thrust is moved upwards to move the balls inwards and the cylinder gets unfixed.

EFFECT: improved reliability, expansion of functionalities, and decrease in accident rate.

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