Ultrasonic attenuation method for measuring phase holdup in oil-water annular flow
To investigate the measurement of phase holdup of oil-water annular flow by ultrasonic attenuation method,a model of oil-water annular flow was created using COMSOL simulation software.The ultrasonic sensor structure was in size of 6mm,and the ultrasonic emission frequency was 1MHz.The relationship between ultrasonic attenuation coefficient and oil content of oil-water annular flow was determined through analyzing the ultrasonic attenuation characteristics of oil-water annular flow,establishing the measuring range of linear relationship.Based on this,the correlation factors of non-ideal annular flow and their influence on ultrasonic attenuation characteristics were investigated further.The differential threshold of non-ideal annular flow was presented to quantify the effects of non-ideal annular flow parameters on the ideal annular flow ultrasonic attenuation method.The range for the differential threshold of 10%was proposed for the degree of concentric and ellipticity of the non-ideal annular flow.Finally,the static verification experiment of oil-water annular flow was carried out.The results showed that the phase holdup of oil-water annular flow was in the range of 5%—30%,which was linearly connected to the ultrasonic attenuation coefficient.The differential threshold of non-ideal annular flowed varies from 0.75-1 and from 0-5%in the range of±10%,respectively.The trends in the experimental and simulation results were similar,attesting to the reliability of the simulation model.
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