CAJ | 학술논문

为了利用钻柱作为声波信道实现地面与井下之间的信息传输，需要研究声波沿钻柱最优传输特性。建立用于井下信息声传输特性研究的非周期性钻柱组合模型，利用等效透声膜法，对8根不同长度的钻杆组合和不同截面积的钻杆组合的声传播特性进行了研究分析。结果表明，对于不同长度钻具组合，先增后减的钻具组合和先减后增的钻具组合的声传播特性优于其他钻具组合构建的声波钻柱模型；对于不同截面积钻具组合，先减后增的钻具组合的声传播特性优于其他钻具组合构建的声波钻柱模型。信道的建模与计算机仿真研究最优声波沿钻柱传输特性，可为声波信号更好传输研究提供有力的技术支持与测试平台。
위료이용찬주작위성파신도실현지면여정하지간적신식전수，수요연구성파연찬주최우전수특성。건립용우정하신식성전수특성연구적비주기성찬주조합모형，이용등효투성막법，대8근불동장도적찬간조합화불동절면적적찬간조합적성전파특성진행료연구분석。결과표명，대우불동장도찬구조합，선증후감적찬구조합화선감후증적찬구조합적성전파특성우우기타찬구조합구건적성파찬주모형；대우불동절면적찬구조합，선감후증적찬구조합적성전파특성우우기타찬구조합구건적성파찬주모형。신도적건모여계산궤방진연구최우성파연찬주전수특성，가위성파신호경호전수연구제공유력적기술지지여측시평태。
In order to develop a communication system that uses extensional stress waves in hollow steel drill pipe to carry encoded data between the bottom of well and the operator,it is necessary to know the optimal signal transmission characteristics.An aperiodic model of drill-string assembly was established to characterize the downhole information transmission and analyz the characteristics of combinations of eight drill pipes with different lengths and different cross-sectional areas by applying the reflectionless acoustic transmission model(RATO).The results showe that the ascent-then-descend(ATD)and the descend-then-ascent(DTA)pipe arrangements have more efficient energy transfer capability than other pipe arrangements for different lengths of bottom hole assemblies(BHA).The DTA pipe arrangement has more efficient energy transfer capability than other pipe arrangements for different cross-sectional areas of BHAs.The analysis on the RATO of drill tools and the simulation of optimal transmission of the acoustic drilling string channel provide theoretical and technical foundation for the further research of acoustic telemetry.