Gas-liquid two-phase mass flowmeter

Abstract

The invention provides a gas-liquid two-phase mass flowmeter. The gas-liquid two-phase mass flowmeter comprises a mass flowmeter, a differential pressure composite sensor and a flow computer, whereinthe mass flowmeter is used for measuring a mass flow, a temperature and a mixing density of a tested gas-liquid two-phase fluid; a differential pressure positive pressure pipe and a differential pressure negative pressure pipe of the differential pressure composite sensor are respectively connected with a pipeline, flowing to downstream and a pipeline, flowing to upstream, of the mass flowmeter; the differential pressure composite sensor is used for measuring average pressure and differential pressure of the tested gas-liquid two-phase fluid before and after flowing through the mass flowmeter;and the flow computer is connected with each of the mass flowmeter and the pressure differential composite sensor, and is used for calculating a gas-liquid two-phase flow of the tested gas-liquid two-phase fluid by combining a database in the mass flowmeter according to measurement parameters of the mass flowmeter and the differential pressure composite sensor, external input liquid-phase densityand gas-phase density. The gas-liquid two-phase mass flowmeter can be applied to condensate natural gas wells, aqueous shale gas wells, oil wells and other fields of multi-phase flow measurement, andthe measurement range and adaptability of the gas-liquid two-phase mass flowmeter are improved.

Description

technical field [0001] The invention relates to industrial multiphase flow measurement, in particular to a gas-liquid two-phase mass flowmeter. Background technique [0002] As a flowmeter with excellent performance and high precision, mass flowmeter has been widely used in gas and liquid flow measurement in industrial fields. [0003] At present, the traditional mass flowmeter can only use gas phase or liquid phase (single phase) as the measurement medium. If the volume percentage of the gas phase in the liquid phase exceeds 5% to 10%, the mass flowmeter will drive abnormally, stop or restart , the noise becomes larger, and the vibration frequency is out of control, resulting in large errors or inability to measure. [0004] In addition, when the mass flowmeter is used to measure the gas-liquid two-phase flow, there is another problem: the lower limit flow measurement value is relatively high, and the gas-liquid ratio and flow fluctuation are the normal working conditions ...

AI Technical Summary

Problems solved by technology

[0003] At present, the traditional mass flowmeter can only use gas phase or liquid phase (single phase) as the measurement medium. If the volume percentage of the gas phase in the liquid phase exceeds 5% to 10%, the mass flowmeter will drive abnormally, stop or restart , the noise becomes louder, and the vibration frequency is out of control, resulting in a large error or unable to measure

[0004] In addition, when the mass flowmeter is used to measure the gas-liquid two-phase flow, there is still a problem: the lower limit flow measurement value is relatively high, and the gas-liquid ratio and flow fluctuation are the normal working conditions of the gas-liquid two-phase flow. The mass flowmeter will increase the measurement error of the gas-liquid two-phase flow and the measurement result of the small flow rate will be zero. The above problems greatly limit the wide application of the mass flowmeter to measure the gas-liquid two-phase flow

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