Method for measuring multiphase flow based on multi-section impedance type long-waist inner core and related speed measurement

Abstract

The invention belongs to the technical field of fluid measurement, and relates to a method for measuring a multiphase flow based on a multi-section impedance type long-waist inner core and related speed measurement. An adopted sensor comprises a cone throttling member, a shrinkage pressure drop differential pressure transmitter, a permanent pressure loss differential pressure transmitter and an electrical sensitive sensor. The method comprises the following steps of: acquiring two pairs of differential pressure signals generated by the cone throttling member; acquiring an electrical signal byusing the electrical sensitive sensor; calculating volume flow of mixed fluid according to a correlation method; measuring data according to the differential pressure signals and the electrical signal; classifying, identifying and prejudging a flow pattern by using a support vector machine; measuring dielectric constant of the mixed fluid by using a capacitive model; measuring conductivity of themixed fluid by using a conductivity model; and calculating a procedure parameter of an oil-gas-water flow. The method is not influenced in spite of conductivity of a continuous phase of the multiphase flow, and has the characteristics of high measuring accuracy, high reliability, more acquirable measuring information and the like.

Description

technical field [0001] The invention belongs to the technical field of fluid measurement, and specifically relates to a measurement method that integrates the principle of differential pressure measurement and the principle of electrical measurement, which is used to determine the content of each phase component of a multiphase flow within the range of a continuous phase from a conductive phase to a non-conductive phase, Parameters such as velocity and flow. The present invention takes the measurement of oil / gas / water multiphase flow as the description object, but is not limited to this application, and the measurement method of the present invention is still applicable in other industrial processes and chemical reactions. technical background [0002] Multiphase flow usually refers to the flow of two or more substances at the same time, including gas-liquid two-phase flow, gas-solid two-phase flow, liquid-solid two-phase flow, liquid-liquid two-phase flow, and gas-liquid-li...

AI Technical Summary

Problems solved by technology

The inner cone flowmeter can achieve more accurate and effective flow measurement of clean or dirty fluid with a wider range ratio under the condition of a shorter straight pipe section, but its own structural characteristics also have some disadvantages: at the tail of the cone The existence of the vortex area causes the pulsation of the pressure signal here, which reduces the measurement accuracy and repeatability, and the overall pressure loss is large. For example, the structural deformation of the inner cone flowmeter is made according to the flow characteristics of the multiphase flow, such as the inner Venturi tube. , spindle flowmeter and shuttle flowmeter, etc., can effectively improve the accuracy and stability of multiphase flow measurement

However, tomography technology has not yet met the requirements of industrial applications in terms of real-time performance, measurement accuracy, and image quality, and the conflict between the rapidly changing characteristics of multiphase flow and the complexity of tomography image reconstruction algorithms may lead to inconsistencies in the calculation results. big error

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