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Working mechanism and experimental study of electromagnetic measurement while drilling systems based on a relay station
Geophysical Prospecting ( IF 1.8 ) Pub Date : 2021-01-25 , DOI: 10.1111/1365-2478.13075
Chunhua Lu 1, 2 , Rongjing Wang 1, 2 , Huibin Zhao 1 , Tao Zhang 1
Affiliation  

Electromagnetic measurement while drilling systems transmit downhole data via an information channel composed of a drill string and formation; the formation has a strong attenuation effect on the signal. Signal attenuation during electromagnetic wave transmission through the formation limits the well depth at which this technique can be applied. This paper discusses several commonly used methods to improve the depth at which electromagnetic measurement while drilling applications can be conducted, including turbine power supplies, adaptive power outputs and transmitting antenna extensions. Based on both theory and practice, the characteristics of these methods are analysed, and a relay station‐infused electromagnetic measurement while drilling system is proposed. The relay station‐infused electromagnetic measurement while drilling system consists of a downhole instrument assembly, a relay station and a ground receiver assembly. The repeater receives the electromagnetic wave signal from the underground transmitter and, after amplification, decoding and other processing, re‐encodes the signal and forwards it to the ground receiver at different frequencies, so as to increase the underground electromagnetic wave signal relay transmission. The design of the relay station module is introduced in detail, and the influencing factors and rules of signal transmission are analysed. Signal transmission experiments show that the electromagnetic measurement while drilling system based on a relay station can reliably represent the relay of signals and can thus be used in deeper wells.

中文翻译:

基于中继站的随钻电磁测量系统的工作机理与实验研究

随钻电磁测量系统通过由钻柱和地层组成的信息通道传输井下数据;地层对信号有很强的衰减作用。通过地层的电磁波传输过程中的信号衰减限制了可以应用此技术的井深。本文讨论了几种常用的方法,以改善可进行钻井应用时进行电磁测量的深度,包括涡轮机电源,自适应功率输出和发射天线扩展。在理论和实践的基础上,分析了这些方法的特点,提出了继电系统随钻测量电磁干扰的方法。中继站注入式随钻电磁测量系统由井下仪器组件,中继站和地面接收器组件组成。转发器从地下发射器接收电磁波信号,经过放大,解码和其他处理后,再对信号进行重新编码,然后以不同的频率转发到地面接收器,以增加地下电磁波信号的中继传输。详细介绍了中继站模块的设计,分析了影响信号传输的因素和规律。信号传输实验表明,基于中继站的随钻电磁测量系统可以可靠地表示信号的中继,因此可以在更深的井中使用。中继站和地面接收器组件。转发器从地下发射器接收电磁波信号,经过放大,解码和其他处理后,再对信号进行重新编码,然后以不同的频率转发到地面接收器,以增加地下电磁波信号的中继传输。详细介绍了中继站模块的设计,分析了影响信号传输的因素和规律。信号传输实验表明,基于中继站的随钻电磁测量系统可以可靠地表示信号的中继,因此可以在更深的井中使用。中继站和地面接收器组件。转发器从地下发射器接收电磁波信号,经过放大,解码和其他处理后,再对信号进行重新编码,然后以不同的频率转发到地面接收器,以增加地下电磁波信号的中继传输。详细介绍了中继站模块的设计,分析了影响信号传输的因素和规律。信号传输实验表明,基于中继站的随钻电磁测量系统可以可靠地表示信号的中继,因此可以在更深的井中使用。解码和其他处理,对信号进行重新编码,然后以不同的频率将其转发到地面接收器,以增加地下电磁波信号的中继传输。详细介绍了中继站模块的设计,分析了影响信号传输的因素和规律。信号传输实验表明,基于中继站的随钻电磁测量系统可以可靠地表示信号的中继,因此可以在更深的井中使用。解码和其他处理,对信号进行重新编码,然后以不同的频率将其转发到地面接收器,以增加地下电磁波信号的中继传输。详细介绍了中继站模块的设计,分析了影响信号传输的因素和规律。信号传输实验表明,基于中继站的随钻电磁测量系统可以可靠地表示信号的中继,因此可以在更深的井中使用。分析了信号传输的影响因素和规律。信号传输实验表明,基于中继站的随钻电磁测量系统可以可靠地表示信号的中继,因此可以在更深的井中使用。分析了信号传输的影响因素和规律。信号传输实验表明,基于中继站的随钻电磁测量系统可以可靠地表示信号的中继,因此可以在更深的井中使用。
更新日期:2021-01-25
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