Multi-phase flow measuring methods based on single-section impedance long-waist internal cone sensor

Abstract

The invention belongs to the technical field of fluid measurement, and relates to multi-phase flow measuring methods based on a single-section impedance long-waist internal cone sensor. The adopted sensor comprises a cone throttling piece, a systolic pressure drop differential pressure transmitter, a permanent pressure loss differential transmitter and an electrical sensitive sensor. According tothe difference of properties of continuous phases, the invention provides two measuring methods which have the same inventive concept and respectively comprise the following steps of: collecting two pairs of differential signals generated by the cone throttling piece; collecting electrical signals by utilizing the electrical sensitive sensor; calculating the total mass flow rate, the mass flow rate of each phase and the mass content of each phase according to a double-differential model of a single throttling piece; selecting a corresponding electrical method according to whether the continuous phases are conductive, and calculating the section content of each phase; and selecting a corresponding calculating model, and calculating the procedure parameters of an oil phase, a gas phase and an aqueous phase. The multi-phase flow measuring method is characterized by high measuring precision, high reliability, capability of obtaining more measurement information, low cost and the like, andcan be widely applied in the industries of petroleum, chemical engineering, energy power, metallurgy 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 ratio, flow rate and flow and other parameters. 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-liquid and gas-liquid-solid multiphase flow flow etc. Multiphase flow in pipelines often occurs in modern engineering fields ...

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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