Study on the Downhole Influence Factors of Radio Frequency Identification Technology
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摘要: 与井下工具常用的压差和投球控制方式相比，射频识别技术具有控制灵活、施工过程中不改变钻井液排量和钻柱内通径等优点；但在实际应用中，井下复杂工况对射频识别系统的电磁干扰很大，其稳定性得不到保证。为解决这一问题，开展了井下射频电磁识别影响因素研究。通过分析，确定井下工具金属外壳和钻井液类型是主要影响因素；根据无线射频控制系统的工作环境和结构特点，建立了电磁通讯环境的有限元仿真模型，分析了其影响程度和变化规律，并通过室内试验对其进行了验证。研究发现，井下工具金属外壳所产生涡流的影响随井下天线与工具外壳间距增大而减小；钻井液的影响随其电导率增大而增大。研究认为，设计工具时可以合理增大井下工具金属外壳内壁与井下天线的间距；而钻井液的影响可通过优化射频控制电路方式解决。Abstract: Compared with the conventional control method of measuring differential pressure or pitching,the radio frequency identification technology is flexible,and drilling fluid displacement and borehole diameter can be maintained constant during the operation process.However,due to the complexity of downhole conditions,electromagnetic interference affects the stability of a radio frequency identification system in practical application.In order to solve this problem,the electromagnetic influence of radio frequency identification in the underground environment was carried out.Through analysis,it was determined that downhole metal and different types of drilling fluid were the main factors of influence or interference.According to the working environment and structure characteristics of radio frequency control system,the finite element simulation model of electromagnetic environment was established t,the influence degree and variation rule of downhole metal environment and different types of drilling fluid were analyzed and verified by means of lab test.The simulation results showed that the eddy current effect of downhole metal decreased as the space of the antenna and the casing of downhole tools increased,and the influence of drilling fluid would increase with its electro-conductibility increasing.Therefore,the space between the antenna and the inner wall of downhole tool casing should be increased properly during the design of downhole tools.The influence of drilling fluids could be solved by control circuit optimization.
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Keywords:
- RFID /
- electromagnetic simulation /
- influence factor /
- downhole tool /
- metal casing /
- drilling fluid
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