Oil-gas-water three-phase flow array type electromagnetic correlation flow measurement method

Abstract

An oil-gas-water three-phase flow array type electromagnetic correlation flow measurement method is characterized in that an array type electromagnetic correlation flowmeter with a pair of coil structures is adopted, an upper electrode section and a lower electrode section which are in a distance L are taken on a measured pipeline along the axial flowing direction, and n pairs of detection electrodes are mounted uniformly and equal-angularly on each electrode section along the periphery of the inner wall of the measured pipeline, wherein n is larger than or equal to 2 and smaller than or equal to 16. The measurement method includes: an induction potential difference signal xi (i=1, 2, ...n) is generated between each pair of upper detection electrodes, an induction potential difference signal yi is generated between the corresponding pair of lower detection electrodes, and the time ti spent by fluid flowing through the sections of the upper and lower electrodes is calculated according to a mutual correlation method so as to obtain an average velocity vi; precise estimations of average velocities of oil-gas-water three-phase flow are obtained according to a data fusion method, and flux of oil-gas-water three-phase flow is obtained by means of comprehensive measurement of the cross section area of the pipeline and flow velocity signals. The oil-gas-water three-phase flow array type electromagnetic correlation flow measurement method guarantees accuracy in flux measurement of oil-gas-water three-phase flow.

Description

technical field [0001] The invention relates to an array-type electromagnetic correlation flow measurement method for oil-gas-water three-phase flow, in particular to an array-type electromagnetic correlation flow measurement method for conductive oil-in-water and gas-in-water oil-gas-water three-phase flow. Background technique [0002] The traditional electromagnetic flowmeter is an instrument for measuring flow. It obtains the flow by measuring the average flow velocity of the fluid and combining the cross-sectional area of ​​the sensor pipe. Compared with the turbine flowmeter, the electromagnetic flowmeter is non-invasive and does not produce pressure loss. It is not affected by the characteristics of the fluid itself such as fluid temperature, pressure, density and viscosity, and can quickly respond to changes in the flow of the fluid. [0003] Traditional electromagnetic flowmeters are suitable for measuring the flow of conductive single-phase fluids (such as water). ...

AI Technical Summary

Problems solved by technology

For oil-in-water and air-in-water oil-gas-water three-phase flow with high water content, since the fluid contains non-conductive oil-gas phase, it will also affect the flow velocity distribution on the cross-section of the measuring pipe. At this time, the application of traditional electromagnetic flowmeter measurement has defects. , the error of the measurement result is large

Images