Patent ID: 6092595
Filing Date: 2000-07-25
Classification: E21B

Abstract:
A deep drilling system, comprising:a) a driving motor;b) a drilling spindle connected to the driving motor;c) a hydrodynamic retarder having a rotor blade wheel and a stator blade wheel, the retarder being disposed between the driving motor and the drilling spindle to compensate for restoring torques on the drilling spindle occurring during a change in operating state, the rotor blade wheel and the stator blade wheel forming a toroidal working space filled with a working medium during operation of the deep drilling device, the rotor blade wheel being continuously connected to the driving motor, the rotor and stator each having blades sloped relative to a plane of separation between the rotor blade wheel and stator blade wheel, the blades being sloped to a degree to cause the rotor blade wheel to rotate essentially in a freewheeling manner during operation of the drilling spindle, and to produce a braking torque during occurrence of restoring torques on the drilling spindle, occurring during interruption of power flow from the motor.