测井技术2011，Vol.35Issue(3)：224-229,6.
随钻电磁波测井仪器线圈系参数设计方法研究
On Coil System Design for MWD Electromagnetic Wave Logging Tools
赵媛 1顿月芹 1袁建生1
作者信息
- 1. 清华大学电机工程与应用电子技术系电力系统国家重点实验室，北京100084
- 折叠
摘要
Abstract
The coil system with transmitting and receiving antennas at a fixed frequency is the key structure of electromagnetic logging-while-drilling tools. In this paper, the basic principles of e-lectromagnetic wave logging-while-drilling are studied. The key design parameters including the source frequency, the transmitter-receiver spacing and the receiver interval are analyzed, and the principles and steps of coil system design are given. A critical requirement in the design of the coils system is to produce different desired signals for different typical ground models. The parameters must be reasonable values to achieve the desired effect. The simulation results show that the source frequency is affected by conductivity, dielectric constant and the required precision of minimum phase difference. The lower frequency can increase the investigating depth, but will reduce the investigating characteristic of thin layers. The receiver interval is affected by the minimum electromagnetic wavelength, the required precision of minimum phase difference and the minimum thickness of the horizontally thin-layer that can be detected. Reducing the receiver interval can improve investigating characteristics of thin layers, but if the spacing is too small, it will affect the resolution of the phase difference. The transmitter-receiver spacing can affect the investigating depth. It can increase the investigating depth, but too larger spacing will make the signals too small. The results provide a valuable reference for the design of electromagnetic logging-while-drilling tools.关键词
随钻电磁波测井；线圈系；参数；设计；探测特性Key words
LWD electromagnetic wave log/ coil system/ parameter/ design/ investigating char-acteristic分类
天文与地球科学引用本文复制引用
赵媛,顿月芹,袁建生..随钻电磁波测井仪器线圈系参数设计方法研究[J].测井技术,2011,35(3):224-229,6.
