SIDE HOLE DRILLING DEVICE Russian patent published in 2012 - IPC E21B7/08 

FIELD: mining.

SUBSTANCE: invention includes a wedge-like diverter with a fastening mechanism made in the form of hydraulic anchor, cutting tool attached to upper part of wedge-like diverter by means of a detaching device with a shear bolt and fluid supply channel connecting the cavity of drill pipes and cavity of cutting tool to working cavity of anchor. Cutting tool is equipped with a cylinder, and detaching device is made in the form of a piston installed in the cylinder and rigidly attached to shear bolt, which is located perpendicular to upper diverting surface of the wedge and has annular grooves. One of the grooves is located below the wedge surface, and the other one is located in housing of cutting tool. Piston is fixed in transport position by means of a limit stop designed for the force of detachment of cutting tool from wedge at the pressure exceeding the pressure of fastening the hydraulic anchor in the well shaft.

EFFECT: due to the fact that it is possible to detach the cutting tool from the wedge by the fluid pressure, the operating reliability of the device in horizontal sections of inclined and multibranch wells will be improved and probability of emergency situations will be reduced.

2 dwg