Response characteristics of drill-string guided wave in downhole acoustic telemetry  

作　　者：赵傲耸 陈浩 何晓 王秀明 曹雪砷 Ao-Song Zhao;Hao Chen;Xiao He;Xiu-Ming Wang;Xue-Shen Cao(State Key Laboratory of Acoustics,Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China;Beijing Engineering Research Center of Sea Deep Drilling and Exploration,Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]State Key Laboratory of Acoustics,Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Beijing Engineering Research Center of Sea Deep Drilling and Exploration,Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190,China

出　　处：《Chinese Physics B》2023年第3期299-307,共9页中国物理B（英文版）

基　　金：the National Natural Science Foundation of China(Grant Nos.11734017 and 12174421);the Scientific Instrument Developing Project of the Chinese Academy of Sciences(Grant Nos.YJKYYQ20200072 and GJJSTD20210008).

摘　　要：Modeling of a drill-string acoustic channel has been an important topic in downhole telemetry for a long time.The propagation of drill-string guided waves in the borehole contains excitation,attenuation,and mode conversion issues that have not been considered by existing modeling methods.In this article,we formulate a hybrid modeling method to investigate the response characteristics of a fundamental-mode drill-string wave in various borehole environments.This hybrid method provides channel functions,including transmitting and receiving deployments,periodicity of the structure,and formation property changes.The essential physics of the drill-string wave propagation is captured with a one-dimensional model.The analytical solutions of the wavefield in multilayered cylindrical structures are introduced into a propagation matrix to express drill-string-wave interactions with the borehole environments.The effectiveness of the proposed method is confirmed through comparison with the finite-difference method.In addition,by designing numerical models,we investigate the conversion effect of the drill-string wave at the tool joint.We demonstrate that the conversion intensity of the drill-string wave is positively correlated not only with the cross-sectional area of the tool joint but also with the wave impedance of the outer formation.Hard formation outside the borehole reduces the energy leakage while intensifying the conversion of drill-string waves to Stoneley waves,and the opposite is true for the drill string in an infinite fluid.The converted Stoneley waves interfere with the drill-string waves,resulting in variations of bandgap distribution,which challenges the reliability of the data transmission.

关 键 词：downhole acoustic telemetry drill-string wave bandgap characteristic mode conversion 

分 类 号：TE151[石油与天然气工程—油气勘探]