井下NFC天线的研究及仿真分析  

Research and simulation analysis of downhole NFC antenna

作　　者：张祁梦莎 胡永建 孙成芹 孙琦 张冠杰 Zhang Qimengsha;Hu Yongjian;Sun Chengqin;Sun Qi;Zhang Guanjie(Beijing Petroleum Machinery Co.,Ltd.,Beijing 102206,China)

机构地区：[1]北京石油机械有限公司,北京102206

出　　处：《电子测量技术》2024年第1期17-22,共6页Electronic Measurement Technology

基　　金：中国石油集团公司直属院所基金(2021DQ03-47)项目资助。

摘　　要：为实现井下复杂环境中的近场通信,首先用三维有限元电磁仿真软件对铁氧体天线结构进行建模仿真,结果表明:线圈半径、导线半径、天线间距对天线正向传输系数的影响较大,铁氧体相对磁导率的影响较小。其次,为探究井下环境对天线传输性能的影响,用阻抗匹配工具对天线进行阻抗匹配,并建立带钻井液介质的金属钻具模型,结果表明:井下金属环境导致正向传输系数衰减3.3dB;钻井液电导率从0S/m增加到2S/m后,正向传输系数衰减8.2dB。将天线仿真模型与相同参数的实物模型进行对比,结果表明基本模型正向传输系数误差小于0.3dB,扩展模型正向传输系数误差小于5.5dB,仿真结果与实物测试结果具有一致性,可指导井下NFC天线设计。Ferrite antenna is modeled by 3D finite element electromagnetic simulation software to achieve near-field communication in complex downhole environments.The results show that the coil radius,wire radius,and antenna spacing have a significant impact on the forward transmission gain(S21)of the antenna,while the influence of the relative permeability of the ferrite loop is relatively small.To investigate the impact of the underground environment on antenna transmission performance,antenna impedance matching is performed,and a drilling tool model with drilling fluid medium is established.The results show that metals cause 3.3 dB attenuation of S21;increasing conductivity of drilling fluid from 0 S/m to 2 S/m causes 8.2 dB attenuation of S21.Simulation results and testing results show great consistency,the deviation of S21 curve is less than 0.3 dB for the basic model and less than 5.5 dB for the extended model,guiding downhole NFC antenna design.

关 键 词：近场通信(NFC) NFC天线 铁氧体环形天线 天线仿真 阻抗匹配 

分 类 号：TN98[电子电信—信息与通信工程] TE927[石油与天然气工程—石油机械设备]