BOTTOMHOLE MOTOR Russian patent published in 2009 - IPC E21B4/02 

FIELD: mining.

SUBSTANCE: bottomhole motor consists of rotor, assembled in stator forming at least one chamber. The rotor has a central opening connected by windows with the chamber and at least three lengthwise grooves with rods installed in them. The motor contains a central shaft assembled relative to the stator and installed in the central opening of the rotor rotating the rotor. The central shaft has at least one internal pressure channel and at least one off-take internal channel. The pressure channel is equipped with a limiter of flow in a low part of the central shaft and has at least one window for fluid medium discharge. The off-take channel is equipped with the limiter of flow in an upper part of the central shaft and has at least one window for inlet of fluid medium. The window of the pressure channel is located opposite to one lengthwise side end of the chamber, while the window of the off-take channel of the central shaft is opposite to another lengthwise end of the chamber. At any angular position of the rotor at least one from windows of the rotor communicates with the window of the pressure channel of the central shaft to let fluid medium flow into the chamber. At least one another window of the rotor communicates with the window of the discharge channel of the central shaft to let flow of fluid medium into the discharge channel of the central shaft.

EFFECT: decreased length of motor, increased reliability of motor operating under high temperature in well more than 120°C.

8 cl, 5 dwg