Wireless short-hop communication is a crucial solution for information transmission between logging while drilling (LWD) and measurement while drilling (MWD). It is important for closed-loop control in geosteering drilling. Compared with wired transmission, wireless short-hop communication offers a cost-effective and stable alternative. Besides, it reduces drilling risks and improves efficiency. Current research primarily concentrates on magnetic dipole (MD) antennas, where resistivity stands as the only continuous variable under investigation, and discussions regarding other parameters may be constrained. It lacks complex models and fails to account for factors such as borehole mud and antenna slots. This article utilizes the finite element method (FEM) to examine the transmitting and receiving characteristics of electric dipole (ED) and MD antennas. Investigate the effects of transmission conditions and instrument structure on the signal. Experimental validation in a water tank substantiates the reliability and practicality of numerical simulation results. It suggests that using a coil number between 150 and 200 turns with a frequency of 5–8 kHz for both antenna structures in oil-based mud can achieve transmission distances of over 15 m. The antenna slot has minimal impact on the signal. Design considerations should prioritize overall structural stability and mechanical strength. These findings contribute valuable insights to the design and optimization of the instrument.

中文翻译：

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井下感应电磁波无线短跳传输影响因素分析与实验研究


无线短跳通信是随钻测井（LWD）和随钻测量（MWD）之间信息传输的重要解决方案。这对于地质导向钻井的闭环控制具有重要意义。与有线传输相比，无线短跳通信提供了一种经济高效且稳定的替代方案。此外，它还降低了钻井风险并提高了效率。目前的研究主要集中在磁偶极子（MD）天线，其中电阻率是唯一正在研究的连续变量，关于其他参数的讨论可能受到限制。它缺乏复杂的模型，并且无法考虑钻孔泥浆和天线槽等因素。本文利用有限元法（FEM）研究电偶极子（ED）和MD天线的发射和接收特性。研究传输条件和仪器结构对信号的影响。水箱实验验证证实了数值模拟结果的可靠性和实用性。研究表明，两种天线结构在油基泥浆中使用线圈匝数为150～200匝、频率为5～8 kHz时，可实现超过15 m的传输距离。天线槽对信号的影响最小。设计考虑应优先考虑整体结构稳定性和机械强度。这些发现为仪器的设计和优化提供了宝贵的见解。