Multiphase flow measurement method based on double-section impedance type long waist cone sensor

Abstract

The invention belongs to the fluid measurement technology field and relates to a multiphase flow measurement method based on a double-section impedance type long waist cone sensor. The adopted sensor comprises a cone throttling element, a systolic blood pressure drop differential pressure transmitter, a permanent pressure loss differential pressure transmitter and an electrical sensitive sensor. The method comprises the following steps: collecting two pairs of differential pressure signals generated by the cone throttling element; utilizing the electrical sensitive sensor to collect an electrical signal; calculating the total mass flow rate, the each-phase mass flow rate and the each-phase mass content according to a double-differential pressure model of a single throttling element; utilizing a support vector machine to realize classify, identify and pre-judge a flow pattern according to the measurement data of the differential pressure signals and the electrical signal; adopting a capacitance model to measure a mixed fluid dielectric constant; adopting a conductivity model to measure the mixed fluid conductivity; and calculating the procedure parameter of oil-gas-water three-phase flow. The multiphase flow measurement method is not influenced by the fact that whether a multiphase flow continuous phase is conducted or not, has the characteristics of high measurement precision,high reliability and the like and can obtain more measurement information.

Description

Technical field [0001] The invention belongs to the technical field of fluid measurement, and specifically relates to a measurement method that combines the principle of differential pressure measurement with the principle of electrical measurement, and is used to determine the content of each phase component of a continuous phase from a conductive phase to a non-conductive phase. Parameters such as flow rate and flow rate. The present invention takes oil / gas / water multiphase flow measurement as the description object, but it 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-liquid and gas-liquid-solid multiphase flow F...

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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