DOWNHOLE HYDRAULIC MOTOR Russian patent published in 2009 - IPC E21B4/02 

FIELD: engines and pumps.

SUBSTANCE: invention is related to technical facilities for drilling and repair of oil and gas wells, namely to downhole hydraulic motors for driving rock-destroying tool. Motor comprises turbine section, spindle, screw section comprising stator and hollow rotor, valve installed in cavity of screw section rotor and distributing flow of drilling fluid between hollow rotor and screw section at different modes of downhole motor operation, unit for connection of screw section hollow rotor and turbine section shaft in the form of hinged joint. Bore is arranged in lower part of rotor, where spring is installed, and movable joint, for instance splined one, which interact with upper head of hinged joint. Movable joint provides for transfer of rotation torque from hollow rotor of screw section to turbine section shaft, and hollow rotor of screw section is installed with the possibility of displacement in axial direction relative to screw section stator that contacts with it.

EFFECT: higher reliability of engine operation due to reduction of screw section start-up torque.

2 dwg