Seal section with internal lubricant pump for electrical submersible well pump
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United States of America Patent
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Sep 25, 2018
Grant Date -
Feb 9, 2017
app pub date -
Apr 15, 2016
filing date -
Aug 6, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
A well pump assembly has a submersible well fluid pump, motor, and seal section with a seal section shaft for transferring rotation of a motor drive shaft to a pump drive shaft. The seal section has a shaft passage through which the seal section shaft extends. A movable compensating element has an interior containing motor lubricant that is in fluid communication with motor lubricant in the motor and also in fluid communication with motor lubricant in the shaft passage. A shaft seal restricts well fluid from entry into the shaft passage. A lubricant pump driven by the shaft has a discharge within the shaft passage below the shaft seal. A recirculation passage extends from the shaft passage at a point between the discharge of the lubricant pump and the shaft seal to the interior of the compensating element.
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