TURBODRILL Russian patent published in 1997 - IPC

FIELD: well drilling. SUBSTANCE: turbodrill includes a body, shaft installed in the body to form ring space, turbines placed in the ring space, radial bearings, multi-row thrust-radial bearing with internal and external races and connecting coupling. The turbodrill is made of one or several turbine and spindle sections enclosing internal bearing races placed on the shaft. External races are placed in the body. Blind axial passage is originated in the lower part of each of each shaft. Passage cavity is open to the ring space through radial passages above the point of bearing mounting. Turbine section shafts have additional radials passages open to the cavity of the radial passage and ring space below the point of bearing mounting. EFFECT: higher efficiency. 2 dwg