A Theory Analysis and Experimental Study on Acoustic Transmission Properties in Drill String
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摘要: 为验证声波在钻柱中的传播特性,获取适合传输井下信息的频率点或频段,以Φ127.0 mm钻杆为研究对象,基于理想钻柱的频率方程,分析了不同长度钻杆的频率与波数的关系。分析认为,钻杆长度的不均匀性将导致钻柱通频带的交集缩小,若钻柱每个周期由不同长度的钻杆连接组成,通带将变窄,甚至在某些频带上因没有重叠部分而形成很宽的阻带。基于理想钻柱的瞬态响应方程,分析了钻杆接头对声波的反射作用,得到了声波通过多根钻杆后的瞬态特性。在室内采用每根长1.5 m的钻杆短节,进行了全尺寸接头钻杆短节声波传播特性试验,研究了不同频率声波在不同长度钻柱中的传播特性,验证了声波在钻柱中传播存在梳妆滤波器特性和色散现象,得到了适合钻柱中传播的声波频率范围和一些频率点,可为声波系统样机的研制提供理论基础和依据。Abstract: In order to validate the acoustic transmission properties in drill string,and get the right frequency point or band for underground information transmission,using Φ127.0 mm drill pipe as the research object,and analyzed the relationship between frequency and wave number of drill pipes with different lengths based on the frequency equation of ideal drill string.The analysis results show that unevenness of drill pipe length will lead to smaller intersection of drill string pass band; if each cycle of drill string consists of drill pipes with different lengths,the pass band will become narrow,or,in some frequency bands form very wide stop band because of no overlap.Based on transient response equation of ideal drill string,the reflection action of drill pipe connector to acoustic wave has been analyzed,to get transient properties of acoustic wave through a lot of drill pipes.Through indoor experiments on acoustic transmission properties with the full size joint,1.5 m-long drill pipe,we studied the transmission properties of different-frequency acoustic waves in different-length drill strings,verified that comb filter and dispersion phenomenon exist in the acoustic transmission in drill string,and got some frequency scope or frequency band that was suitable for acoustic transmission in drill string.
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Keywords:
- drill string /
- drill pipe /
- acoustic wave propagation /
- filtering /
- dispersion
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