TURBODRILL Russian patent published in 2002 - IPC

FIELD: turbodrills. SUBSTANCE: turbodrill has body whose one end is connected to drill pipe for supply of drilling mud. Body accommodates downhole hydraulic motor presenting multistage turbine. Each stage of multistage turbine is formed by guide stator disc forming passage channels and by working rotor disc forming passage channels. Rotor disc is installed on shaft located in body in bearings with possibility of rotation and whose end facing bottom hole carries rock-cutting tool. In this case, total area of inlets of passage channels of stator disc amounts from 1/5 to 3/5 of total area of inlets of passage channels of rotor disc. EFFECT: increased power and torque on rock-cutting tool. 3 cl, 5 dwg