Abstract
Pseudo-slug flow is one of the main branches of the intermittent gas-liquid flow, which is widely encountered in horizontal shale gas well. The structure detection of the pseudo-slug flow is of great significance for revealing the flow pattern transition mechanism, understanding the heat and mass transfer between phases, and modeling the flow parameters. In this paper, we design an ultrasonic sensing system based on ultrasonic pulse-echo technology to detect the structures of pseudo-slug flow and accurately distinguish pseudo-slug from slug and large waves. In the horizontal gas-liquid flow experiment, the response signals of the ultrasonic transducer (UT) were collected, and the flow patterns were recorded synchronously by a wire-mesh sensor (WMS) and a high-speed camera (HSC). Based on the position and amplitude of the first echo of the ultrasonic pulse signal, the liquid film thickness sequence and the amplitude sequence are obtained. The structure of the pseudo-slugs is analyzed by the liquid film thickness sequence. Besides, the AOK TFR algorithm is applied to analyze the amplitude sequence. It is found that the time-frequency representation of the amplitude sequence enables to characterize the occurrences and the frequencies of pseudo-slug flows.
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