CPC E21B 43/128 (2013.01) [E21B 47/008 (2020.05); F04D 13/0626 (2013.01); F04D 13/0633 (2013.01); F04D 13/10 (2013.01); H02K 5/1285 (2013.01); H02K 5/132 (2013.01); H02K 5/1675 (2013.01)] | 21 Claims |
1. A system for producing fluids from a subterranean well, the system comprising:
an electrical submersible pump assembly with a motor-pump unit, where the motor-pump unit has:
a motor housing, the motor housing being an elongated member;
a stator located within the motor housing, the stator having a stator body with an interior cavity extending along a central axis of the stator;
a rotor assembly located within the interior cavity of the stator, the rotor assembly comprising a rotor shaft, a rotor member, and an intermediate rotor bearing assembly, where the rotor member and the intermediate rotor bearing assembly circumscribe the rotor shaft;
an impeller mounted on the rotor shaft and located within the interior cavity of the stator, where the impeller circumscribes the rotor shaft; and
a liner located along an interior surface of the interior cavity, the liner being a thin walled member that is secured to the motor housing and hermetically seals the stator body from a wellbore fluid; where the liner has a polygonal cross section.
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