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

利用Lamb波进行深水隔水管气侵早期监测（英文）

作　　者：Duan Wen-Xing Xiao Cheng-Wen Ai Yong Xin Yi Zhu Lei 

机构地区：[1]Exploration and Development Research Institute of Petro China Tarim Oilfi eld Company,Korla 841000,China

出　　处：《Applied Geophysics》2019年第1期25-32,共8页应用地球物理（英文版）

基　　金：partially supported by the National Science and Technology Major Project(No.2016ZX05003-004)

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.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 field in water-based drilling fluids 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 fluid properties in the pipe, and the position of the top and bottom interfaces of the slug flow were assessed. The simulation results suggests that the amplitude and attenuation of the Lamb waves reflect 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 flow.

关 键 词：Deepwater DRILLING LAMB wave riser GAS infl ux MONITORING 

分 类 号：O[理学]