Two-phase gas-liquid flow capacitive sensor

Abstract

The two-phase gas-liquid flow capacitive sensor includes flange, protecting plate, capacitive plate, connecting pipe, plate pipe, shielding hood and stray capacitance filter circuit. The flanges are fixed to ends of connecting pipe, the plate and the shielding hood are fixed between two flanges, the capacitive plate is set outside the plate pipe, the protecting plate is set outside and the capacitive plate and the shielding hood are connected with lead separately. The protecting plate and the capacitive plate are in some optimal length, the angle of the arced pole plate is 120-140 deg and the radius of the shielding hood is in its optimal value. The present invention has simple structure, low cost, long life, high sensitivity and capacity of measuring flow rate, phase density and sliding ratio, and other advantages. The present invention is suitable for non-invasion measurement of two -phase gas-liquid flow in oil pipeline.

Description

technical field [0001] The invention relates to a capacitive sensor for oil field oil pipeline measurement, in particular to a gas-liquid two-phase flow capacitive sensor. Background technique [0002] In the production of petroleum industry, the crude oil sprayed or extracted from oil wells is a multiphase flow, which contains crude oil, water, natural gas and mud sand, etc. Due to the different flow conditions of the pipeline, this multiphase flow may produce annular flow, Turbulent flow, core flow and other flow patterns, its metering problem is a very complicated problem. And its accurate measurement is an extremely important basis for oil production. For example, the measurement of oil-water content is the most important technical index for evaluating underground oil storage, extraction value, recovery degree and formulation of extraction plan. In order to solve the problem of measuring the mixed flow of substances with different configurations of gas and liquid in oil...

AI Technical Summary

Problems solved by technology

In order to solve the problem of measuring the mixed flow of substances with different configurations of gas and liquid in oil pipelines, separate measurement is usually used, that is, the crude oil is subjected to high-pressure and low-pressure separation processes to separate gas, oil, and water, and then use a plate flowmeter or vortex meter for single-phase measurement. Phase measurement is not only low in efficiency and high in cost, but also has large measurement errors and cannot meet the needs of oil production. Therefore, it is very necessary to study a method that can dynamically reflect all the required data information in real time, that is, accurately measure the flow velocity and phase of multiphase flow. Concentration, sliding ratio, etc., and long life, low cost and non-invasive oil pipeline multiphase flow measurement sensor

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