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. |