Deflecting device for cutting a window in well casing

摘要

1. The deflection device for cutting a window in a well casing comprising a fixed to a hollow drill string mill-reamer, which is suspended on a scissor bolt member biasing the wedge equipped with hydraulic fixing assembly in the casing with a supply channel therein mud flowing through the column drill pipe, wherein the deflecting wedge is formed with an inclined surface in the form of a chute, hydraulic mount deflecting wedge within the casing is provided with a spacer member and at least a ram having on the outer surface of the teeth and the drilling fluid supply passage is formed as a pipe that connects an inner cavity of mill-reamer and a node of the hydraulic mount deflecting wedge in the casing, characterized in that it comprises coaxially mounted within the hollow mill-reamer a fishing sleeve with internal shoulder and circulation holes and the nozzle orifice with a central passage for the effluent and seat ball directed against mud flow jet nozzle is positioned within a fishing sleeve inner shoulder a fishing liner positioned downstream of drilling fluid from the nozzle orifice, the nozzle orifice is connected to a fishing sleeve shear screws and mounted within a fishing sleeve slidably, with site hydraulic mount deflecting wedge within the casing comprises a cylinder liner, bonded with spacer deflecting wedge, hollow stem disposed within the cylinder sleeve, the threaded cap integrated with the bottom part of the cylinder liner, piston ring, taken