US Patent 11591899 Wellbore density meter using a rotor and diffuser

This disclosure relates to an electric submersible pump assembly to measure a density of a fluid in a wellbore. The ESP assembly includes a density meter having a diffuser with an interior volume defined by an inner surface, a rotatable rotor arranged in the interior volume, a measurement channel, and a sensor sub-assembly configured to measure pressures in the measurement channel. The rotor includes a rotor channel defined by a first face of a partition of the rotor and an interior wall of the rotor, extends from an inlet to an outlet. The inlet is arranged at a first radial distance from an axis and the outlet is arranged at a second radial distance from the axis, greater than the first radial distance. The measurement channel, defined by the inner surface of the diffuser and a second face of the partition, extends from the outlet to the inlet.