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. 11. The influence of gas void fraction on amplitude spectra at the flow velocity of 0.65 m/s.