Early monitoring of gas infl ux of drilling fl uid in risers during deepwater drilling using Lamb waves

作者：Duan Wen-Xing,Xiao Cheng-Wen,Ai Yong,Xin Yi,Zhu Lei

摘要：Early warning of gas in deepwater drilling risers is critical to the timely detection of seepage and consequently blowout reduction. We numerically simulate the acoustic fi eld in water-based drilling fl uids from a sound source outside the riser by using a 3D cylindrical coordinates finite-difference method. By changing the gas content of the drilling fluid, the relation between the amplitude and attenuation of the A0- and the S0-mode Lamb waves in the riser, the fl uid properties in the pipe, and the position of the top and bottom interfaces of the slug fl ow were assessed. The simulation results suggests that the amplitude and attenuation of the Lamb waves refl ect the gas content in the riser and are sensitive to low gas content. Moreover, the Lamb waves amplitude and attenuation reflect the position of the top and bottom interface of the slug fl ow.

发文机构：Exploration and Development Research Institute of Petro China Tarim Oilfi eld Company

关键词：DEEPWATERDRILLINGLambwaveriserGASinfluxMONITORING

分类号： O[理学]