CPC F04B 49/06 (2013.01) [E21B 43/128 (2013.01); E21B 47/12 (2013.01); E21B 47/138 (2020.05); F04B 47/06 (2013.01); F04B 53/18 (2013.01); G01L 3/02 (2013.01); H02K 5/124 (2013.01); H02K 5/132 (2013.01); H02K 11/24 (2016.01); H02K 11/30 (2016.01); F04B 2201/1202 (2013.01)] | 19 Claims |
1. An electrical submersible pump assembly for pumping well fluid from a well, comprising:
a pump having a pump housing containing a plurality of pump stages through which a pump shaft extends;
a motor having a motor housing containing a motor shaft;
a seal section having a seal housing containing a seal shaft that is coupled to and between the pump shaft and the motor shaft;
a motor shaft surface SAW (acoustic wave) sensor on the motor shaft;
a motor shaft SAW electronic circuit mounted to the motor housing, the motor shaft SAW electronic circuit having a motor shaft SAW antenna closely spaced to the motor shaft SAW sensor for monitoring torque on the motor shaft;
a controller adapted to be mounted at an upper end of the well for supplying power to the motor;
a motor gauge unit mounted to a lower end of the motor for transmitting signals to the controller; and
a signal line extending from the motor shaft SAW electronic circuit to the motor gauge unit for transmitting signals from the SAW electronic circuit to the motor gauge unit, and from the motor gauge unit to the controller.
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