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. 10. Amplitude spectra when pump is on and off at the gas void fraction of 0.