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Response analyses on the drill-string channel for logging while drilling telemetry

Petroleum Science 2023年第5期20卷 2796-2808页

作者： Ao-Song Zhao Xiao He Hao Chen Xiu-Ming Wang State Key Laboratory of Acoustics Institute of AcousticsChinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China Beijing Engineering Research Center of Sea Deep Drilling and Exploration Institute of AcousticsChinese Academy of SciencesBeijing100190China

Downhole acoustic telemetry(DAT),using a long drill string with periodical structures as the channel,is a prospective technology for improving the transmission rate of logging while drilling(LWD)*** studies only focused on the acoustic property of a free drill string and neglected the coupling between pipes and fluid-filled *** addition to the drill-string waves,a series of fluid waves are recorded in the DAT channel,which has not been investigated *** channel characteristics result in lower transmission rates and stability than ***,a more realistic channel model is needed considering the fluid-filled *** this paper,we propose a hybrid modeling method to investigate the response characteristics of the DAT *** combining the axial wavenumbers and excitation functions of mode waves in radially layered LWD structures,the channel model is approximated to the 1-D propagation,which considers transmission,reflection,and interconversion of the drillstring and fluid *** proposed 1-D approximation has been well validated by comparing the 2-D finite-difference *** is revealed that the transmitted and converted fluid waves interfere with the drill-string wave,which characterizes the DAT channel as a particular coherent multi-path *** a fluid-filled borehole surrounds the drill string,the channel responses exhibit considerable delay as well as strong frequency selectivity in amplitude and *** new findings suggest that the complexity of the channel response has been underestimated in the past,and therefore channel measurements on the ground are *** address these channel characteristics,we apply a noncoherent demodulation *** transmission rate for synthetic data reaches 15 bps in a 94.5 m long channel,indicating that the acoustic telemetry is promising to break the low-speed limitation of mud-pulse telemetry.

关键词： Logging while drilling borehole geophysics Downhole acoustic telemetry Channel modeling Frequency selectivity

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