近钻头无线短传理论及信号衰减特性分析  

Theory and Signal Attenuation Characteristics of Near-bit Wireless Short Hop

作　　者：宋殿光 岳步江[2] 狄帮让[1] 张龙[2] 范业活[3] 贺鸣 SONG Dianguang;YUE Bujiang;DI Bangrang;ZHANG Long;FAN Yehuo;HE Ming(Faculty of Geophysics,China University of Petroleum(Beijing),Beijing 102249,China;Aerospace Science&Industry Inertial Technology Co.,Ltd.,Beijing 100074,China;China Research Institute of Radiowave Propagation,Xinxiang,Henan 453000,China)

机构地区：[1]中国石油大学(北京)地球物理学院,北京102249 [2]航天科工惯性技术有限公司,北京100074 [3]中国电波传播研究所,河南新乡453000

出　　处：《西安石油大学学报（自然科学版）》2020年第2期98-103,共6页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：国家科技重大专项“旋转导向钻井系统研制”(2016ZX0522002)。

摘　　要：利用等效理论将螺线环天线等效成磁流环,使电流环和螺线环两种天线可共用同一仿真模型。利用COMSOL有限元软件实现了仿真建模,通过分别加载电流源和磁流源,实现了两种类型天线的无线短传信号仿真计算。通过大量算例分析,得到了地层电阻率、工作频率、天线与钻铤间距、源距和井眼等参数对两种天线信号衰减的影响规律,给出了两种短传天线工作性能与井况的对应关系。本研究对研制无线短传传感器,以及更好地理解和掌握该类仪器信号的衰减特征具有重要参考价值。Toroid antenna can be equivalent to the magnetic current loop using the equivalence theory,and then the current loop and the toroid antenna can share the same simulation model.The simulation model is established by COMSOL finite element software,and the simulation of short hop signal of two kinds of antennas is achieved by loading current source and magnetic current source respectively.The influence laws of formation resistivity,operating frequency,distance between antenna and drill collar,source distance and borehole parameters on the signal attenuation of two kinds of antennas are obtained through a large number of examples,the corresponding relations between the performance of two kinds of short transmission antennas and well conditions are given.The modeling methods and the conclusion given in this paper have important reference value for developing this kind of instrument,and understanding and mastering the signal attenuation characteristics of this kind of instrument better.

关 键 词：近钻头测量 无线短传 电流源 磁流源 螺线环天线 有限元素法 

分 类 号：TE927[石油与天然气工程—石油机械设备]