Patent ID: 6120261
Filing Date: 2000-09-19
Classification: F04D

Abstract:
In combination, an improved electric motor and submersible pump apparatus for assembly between a first section and a second section of axially aligned well tubing for moving a liquid through the tubing, the motor and pump combination comprising:a) a hollow drive shaft that is mounted for rotation in axial alignment with the axis of the tubing, the drive shaft having an intake end and a discharge end and of a diameter sufficient to pass wireline logging tools and devices required to monitor and maintain the well tubing;b) bearings mounted on the exterior of, and proximate to the ends of the hollow drive shaft;c) a motor housing secured to the downstream end of the first section of tubing;d) a stator secured to the interior of the motor housing;e) a rotor mounted on the drive shaft proximate the stator;f) a pump housing secured to the upstream end of the second section of tubing, the pump housing containing pump impellers mounted on the hollow drive shaft for rotation inside of the pump housing;g) an annular seal between the discharge end of the pump housing and the drive shaft;h) a plurality of intake ports in the hollow drive shaft in fluid communication with the intake end of the pump and a plurality of discharge ports in the hollow drive shaft in fluid communication with the discharge end of the pump; andi) a check valve mounted on the interior of the drive shaft between the intake ports and discharge ports said check valve having a valve closure member movable between open and closed positions.