METHOD TO MEASURE FLOW RATE OF MULTI-PHASE FLUID Russian patent published in 2014 - IPC G01F1/66 

FIELD: measurement equipment.

SUBSTANCE: method to measure flow rate of a multi-phase fluid, which consists in measurement of acoustic noise created by liquid movement as it flows via the available cross section, the speed of fluid passage is determined by frequency of acoustic noise caused by unevenness of liquid motion, previously they measure flow temperature and pressure in the pipe, density of each phase, and then, based on proposed dependences they calculate volume or mass fractions of each phase. At the same time, using laboratory results, they make equations of dependence of sound speed in each phase on pressure and temperature, and the equation of sound speed for water is complemented with the dependence on water salinity, at the same time the produced equations are recorded into a computing unit, they measure pressure and temperature in the pipeline, water salinity, they measure and record amplitudes and frequencies of oscillations in the pipe, along which the multi-phase liquid is flowing, the measured range of frequencies is divided into parts that correspond to each phase, in each of the parts after application of quick Fourier transforms they identify maximum values of amplitudes and appropriate frequencies, and calculate the volume flow rate of each phase of liquid in accordance with the appropriate formula.

EFFECT: reduced error of measurement in each phase.

4 dwg