Patent ID: 11913444
Assignee: SENSIA LLC
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  E  H | IPC E  F  H

Claim 14:
15. A non-transitory computer-readable medium encoded with instructions that, when executed by a processor, cause operations comprising:
receiving a measurement of a current of an electrical drive signal powering an electrical submersible pump (ESP);
receiving a measurement of a voltage of the electrical drive signal;
calculating speed of a shaft of an electric motor of the ESP based on a frequency detected in the current, wherein the frequency is induced in the current by rotation of the electric motor;
calculating, based on the speed, a density of a fluid in the ESP and a flow rate of the fluid in the ESP;
calculating a resistance of a conductor that electrically couples the ESP to circuitry that generates the electrical drive signal as a function of temperature of the conductor;
calculating a resistance of a stator of the ESP as a function of a temperature of the electric motor;
calculating a torque in the ESP based on the measurement of the current, the measurement of the voltage, the resistance of the conductor, and the resistance of the stator; and
reducing the speed of the electric motor responsive to the density being lower than a predetermined threshold value.