煤矿安全2024，Vol.55Issue(12)：221-228,8.DOI:10.13347/j.cnki.mkaq.20231899
煤矿井下钻杆中声波传播特性分析
Analysis of acoustic wave transmission characteristics in underground coal mine drill pipe
摘要
Abstract
The acoustic wave transmission of MWD data is an important means to realize the high-speed and accurate transmission of borehole data in coal mine,which is conducive to changing the situation that most of the underground gas extraction in coal mine is in"blind drilling".In order to verify the reliability of acoustic wave transmission in drill pipe,the acoustic wave propagation characteristics of drill pipe pillar composed of mining drill pipe are investigated.According to the basic theory of sound wave trans-mission in solid,the sound wave transmission channel is equivalent to a periodic structure composed of drill pipe and its joint,and the transmission characteristics of sound wave in drill pipe are analyzed by using the propagation equation of sound wave in periodic structure.Through numerical simulation,the propagation of sound waves in drill pipe is analyzed,and the effects of different drill pipe diameters,knock positions and sand injection conditions on the propagation characteristics and attenuation law of sound waves are compared.The results show that the larger outer diameter of drill pipe and the lower knock point are beneficial to signal transmis-sion.The water injection signal inside the drill pipe attenuates obviously,and the amplitude of the signal attenuates exponentially,while the influence of the external sand environment on the signal intensity can be ignored.The excitation signal,acoustic output and attenuation characteristics obtained by the test platform agree with the basic trend of the simulation results.关键词
随钻测量/钻杆/声波传播特性/频谱/有限元法Key words
measurement while drilling/drill rod/acoustic transmission characteristic/frequency spectrum/finite element method分类
矿业与冶金引用本文复制引用
任玺宁,高珺,张佳..煤矿井下钻杆中声波传播特性分析[J].煤矿安全,2024,55(12):221-228,8.基金项目
陕西省重点研发计划资助项目(2021GY-331) （2021GY-331）
