WELL DRILLING DEVICE Russian patent published in 2007 - IPC E21B4/02 

FIELD: oil, gas and exploratory hole drilling, particularly gyrator downhole motors.

SUBSTANCE: device comprises multiple gyrator mechanism including movable stator and fixed rotor. Multistart left-directed tread is formed on inner stator surface and outer rotor surface so that difference between number of stator and rotor ribs is equal to 1. Rotor is fixedly connected to drill string by means of torsion shaft and hollow semi-axle provided with through channels. To protect device against drilling fluid leaks and to provide axial force taking device has axial sealing support.

EFFECT: increased efficiency of horizontal well drilling, increased drill bit penetration rate due to dynamic load to be applied to face and due to drill bit momentum (without drilling string rotation) increased by downhole motor stator rotation.

1 dwg