Below Motor Equalizer of Electrical Submersible Pump and Method for Filling

摘要

An electrical submersible pump assembly has a pressure equalizer coupled to a lower end of a motor. The equalizer has a motor lubricant passage through which lubricant in the motor communicates with motor lubricant in the equalizing element. A valve element in the motor lubricant passage has a closed upper position and an open lower position. The valve element has a drive member on an upper end that mates with a shaft drive member on a lower end of the motor shaft while the valve element is in the upper position and disengages from the shaft drive member while the valve element is in the lower position. A locking feature between the valve element and the motor lubricant passage retains the valve element in the upper position and is releasable in response to rotation of the motor shaft in a selected direction.

主权项

1. An electrical submersible pomp assembly, comprising:
a pump; a motor having a rotatable shaft extending along a longitudinal axis and operatively coupled to the pump for driving the pump; a pressure equalizer coupled to an end of the motor, the equalizer having a movable element for communicating well fluid pressure exterior of the pressure equalizer to motor lubricant in the motor; an adapter that connects the equalizer to the motor, the adaptor having a motor lubricant passage through which motor lubricant in the motor communicates with motor lubricant in the equalizing element; and a valve located in the motor lubricant passage that selectively opens and closes the motor lubricant passage.