中文摘要：

石油钻井过程中使用的钻柱自上而下贯穿整个井筒，钻柱是连续的钢质结构，为声波的高速传输提供了得天独厚的条件，被认为是一种很有潜力的高速通信方法。为此，笔者对纵波声波信号在钻柱信道中传输的时频域特性进行研究，并对钻井液阻尼的影响规律进行分析。研究结果表明，纵波声波以正弦信号形式传输效果较理想，钻井液阻尼对钻柱信道传输性能的影响较小；信道通带内的频率信号传输性能较好，经过钻柱信号的幅值和波形保持良好，阻带内的频率信号经过钻柱时其幅值衰减明显，并产生显著的色散现象，信号波形失真严重。因此，传输信号频率应尽量洗择在低师段的捅师带内。

英文摘要：

As a continuum steel structure, drill strings provide a unique condition for high-speed transmission of sound waves, which is considered to be a promising method for high-speed communications. So the characteristic of the acoustic wave transmitting through the drill string is simulated. The influence of the drill fluid viscous damp- ing is analyzed. The results show that signal transmission performance of pure sinusoidal longitudinal wave is good. The effect of the drill fluid viscous damping on the signal transmission performance is small. And the signal transmission performance is good in passband, waveform and spectrum of the frequency transmit well, while the waveform and spectrum distortion of the stopband frequency is severe with significant chromatic dispersion. Therefore, the transmission signal frequency should be selected in the low frequency passband.