声波沿钻柱最优传输特性的研究  

Optimization of acoustic communication along the drillstring

作　　者：周静[1] 邱彬[1] 倪文龙[1] 尚海燕[1] 

机构地区：[1]西安石油大学井下测控研究所,西安710065

出　　处：《振动与冲击》2015年第18期161-165,204,共6页Journal of Vibration and Shock

基　　金：国家科技重大专项(2011ZX05021-005);钻井新技术新方法研究(2011A-4206)

摘　　要：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。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 refleetionless 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.

关 键 词：声波遥测 数据传输 信道特性 声信道 

分 类 号：TE927[石油与天然气工程—石油机械设备]