(EN) An apparatus for metering fluid in a subterranean well includes an electric submersible pump (12) having a motor (16), a seal section (18) and a pump assembly (20) and a metering assembly (34). The metering assembly includes an upper pipe section (36) with an outer diameter (38), the upper pipe section having an upper pressure sensing means, and a lower pipe section (40) with an outer diameter (42) smaller than the outer diameter of the upper pipe section, the lower pipe section having a lower pressure sensing means. A power cable is in electronic communication with the electric submersible pump and with the metering assembly.