DIVERTING WEDGE FOR SPUDDING OF OFFSHOOTS FROM WELL Russian patent published in 2013 - IPC E21B7/08 

FIELD: oil and gas industry.

SUBSTANCE: device is intended for spudding of offshoots from cased and non-cased wells; it includes a diverting wedge with a hydraulic anchor, between which there arranged is a reducer, a movable connection between the reducer and the wedge, a fixing assembly of the diverting wedge, which is installed in the reducer. A cutting tool is attached to upper part of the diverting wedge by means of a shear element. At that, cavity of the cutting tool is connected to the anchor cavity through a liquid supply tube. The shear element is equipped with an external annular groove located below the diverting surface of the wedge, and a transverse slot from above. The cutting tool is equipped with a longitudinal cylinder and spring-loaded downward piston with a lateral longitudinal wedge projection corresponding as to the shape to a transverse slot of the shear element. At that, the below-piston cavity of longitudinal cylinder is interconnected with drilling pipes and a supply tube, and the above-piston cavity is interconnected with borehole space. At that, the cutting tool is equipped with a locking element providing fixation of the piston in upper position, above the shear element.

EFFECT: enlarging application field of the device, improving its operating reliability owing to detachment of the cutting tool from the wedge by means of fluid pressure.

3 dwg