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

Claim 11:
12. A method for controlling an electrical submersible pump (ESP), comprising:
generating an electrical drive signal to power the ESP;
measuring a current of the electrical drive signal;
measuring a voltage of the electrical drive signal;
calculating a speed of a shaft of an electric motor of the ESP based on a frequency induced by rotation of the electric motor detected in the current;
measuring a first pressure of a fluid at an intake of the ESP;
measuring a second pressure of the fluid at an outlet of the ESP;
determining a ratio of pressure-to-torque in the ESP based on the first pressure, the second pressure and torque
determining a value of flow of the ESP based on at least the pressure-to-torque ratio;
determining a density of the fluid in the ESP based on at least one of the speed of the shaft or the value of flow of the ESP; and
reducing the speed of the electric motor responsive to the density being lower than a predetermined threshold value.