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

Claim 0:
1. An electrical submersible pump system, comprising:
an electrical submersible pump (ESP) comprising an electric motor;
drive circuitry electrically coupled to the ESP and configured to provide an electrical signal to power the ESP;
a current sensor configured to measure a current of the electrical signal;
a voltage sensor configured to measure a voltage of the electrical signal; and
a processing circuit configured to:
calculate speed of a shaft of the electric motor based on a frequency induced by rotation of the electric motor detected in the current;
calculate a density of a fluid in the ESP based on the speed;
determine a torque in the ESP based on a measured current of the electrical signal, a measured voltage of the electrical signal, a resistance of a conductor that electrically couples the ESP to the drive circuitry, and a resistance of a stator of the ESP; and
reduce the speed of the electric motor responsive to the density being lower than a predetermined threshold value.