BOTTOM-HOLE MOTOR Russian patent published in 2008 - IPC E21B4/02 

FIELD: mining.

SUBSTANCE: invention concerns drilling bottom-hole motors. The motor includes casing elements with engine stator, rotor elements with engine rotor non-coaxial to drill shaft and connected to it kinematically by a flexible shaft over end sealings. The motor has intermediary radial supports increasing longitudinal stability of the flexible shaft, restricting its transverse flexion against rotor engine elements and/or against case elements and preventing regular damage of flexible shaft and elements interacting with it. It allows reduction of flexible shaft diametre (and mass), thus reducing motor vibrations and altering forces and improving motor efficiency and power properties.

EFFECT: reduced motor vibration, improved power properties and efficiency of motor.

2 cl, 1 dwg