A gas kick early detection method outside riser based on Doppler ultrasonic wave during deepwater drilling

YIN Bangtang,LIN Yingsong,WANG Zhiyuan,SUN Baojiang,LIU Shujie,SUN Jinsheng,HOU Jian,REN Meipeng,WANG Ning

Fig. 8. Amplitude spectrum after logarithmic transformation at gas void fraction of 0.