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Ultrasound Array Scanning for Oil-gas-water Three-phase Flow Measurement Based on Plane Wave

Sheng Tian  Chao Tan  Feng Dong  
【摘要】:In order to extract the size and distribution of discrete phases in oil-gas-water three-phase flow, a method that combines an ultrasonic array sensor with plane wave scanning is proposed and studied through numerical simulation. A frequency-domain simulation model is established. The size of the transmitting aperture that can generate plane wave is optimized from four elements to eight elements. Under the action of an ultrasonic plane wave, the curves that could express the relationship between the ultrasound attenuation coefficient(UAC) and the receiving element position of the oil bubble and gas bubble are plotted. We found that these curves have their own inherent variation rules. With transmitting aperture position shift, the UAC curve trend of the gas bubble changes significantly, but the UAC curve trend of the oil bubble has little change. The difference of oil bubble diameter will cause the UAC curve shape of the three-phase flow consistent with the curve shape of oil-water two-phase flow or gas-water two-phase flow. The relationship about the curves of the receiving element position between the variation of UAC could distinguish the spacing between the oil bubble and gas bubble. The transmitting/receiving aperture size for the three-phase flow measurement is selected as four elements/four elements or five elements/five elements, and the excitation-measurement mode is determined. This research lays a foundation for improving the accuracy of image reconstruction in the ultrasound process tomography for multiphase flow.

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