WELL DRILLING DEVICE Russian patent published in 2008 - IPC E21B4/02 

FIELD: mining.

SUBSTANCE: invention concerns mining gerotor type motors and can be applied in drilling of oil, gas and exploration wells. The device includes screw gerotor device with immobile stator with elastic cover and mobile hollow rotor with elastic cover. LH screw thread is made on the inner surface of stator and outer surface of hollow rotor, the number of stator and rotor pitches differing by one. LH screw thread (line) is made on the inner surface of the hollow rotor and outer surface of torsion, the number of hollow rotor pitches differing by one. Eccentricity of immobile torsion is directed opposite to the eccentricity formed by the stator and hollow rotor geometry.

EFFECT: improved reliability of screw pair and launching characteristics of motor.

1 dwg