深层钻探的电磁信息传输方式研究

Study on Electromagnetic Information Transmission for Deep Drilling

摘要:

电磁随钻技术承载信息量大、传输速度快，便于对井下情况进行实时监控，受钻井工艺的影响小，近年来该技术的应用发展十分迅速。概述了目前井下钻探中电磁信号传输应用的基本方式，采用等效传输线方法\[2\]分析了井下发射极的结构参数，并进行了初步试验验证。试验结果能部分验证理论的正确性，但仍有部分参数的计算无法根据理论模型做出合理解释，其试验结果也不甚合理，尚需进一步改善理论模型，以便更好地理解钻杆/大地电磁传输系统。

Abstract:

Electromagnetic measurement while drilling can provide large amount information with high transmission rate, this technique was rapidly applied and developed in recent years. The paper summarized the basic modes of electromagnetic signal transmission in downhole drilling, analyzed the structure parameters of downhole emitting electrode by equivalent transmission line with primary test. The results could only partly prove validity of the verification theory; other parts of parameter calculation could not get the reasonable explanation by theoretical model, which need further improvement to understand drilling rod / magnetotelluric transmission system.