新型电磁随钻测量系统信道传输特性研究  

Transmission characteristics of new electromagnetic-measurement while drilling system

作　　者：李晓[1] 姚爱国[1] 李运升[1] 

机构地区：[1]中国地质大学工程学院,湖北武汉430074

出　　处：《煤田地质与勘探》2010年第2期76-78,共3页Coal Geology & Exploration

摘　　要：电磁波随钻测量不受钻井液性质影响,因而优势得以突现,但其发展瓶颈在于信号传输距离短。论述了电磁波通道式MWD(measurement while drilling)传输装置信道计算的等效传输线法,分析了天线参数、激励源频率等参数的变化对检测电压的影响规律,并通过计算探讨了影响电磁波传输质量的因素。结果显示,地面检测电压随金属环长度增大而增大;温度是对电磁信号传输装置影响显著的一个参数,它能彻底改变电子元件的工作性能,使其丧失功能。因此,工程技术人员可利用等效传输线理论,合理地选择所用激励装置尺寸参数,从而达到优化天线尺寸的目的。EM-MWD （Electromagnetic- measurement while drilling） develops rapidly because it can not be affected by drilling fluid. The main reason limiting its development and application now is that the distance the electromagnetic wave can reach is not deep enough. This paper mainly discusses the method of calculating the transmission channel of electromagnetic MWD system-effective transmission line method. Several factors possibly affecting the quality of electromagnetic wave transmission were discussed. The paper can mainly be divided into two parts： theoretical part and experimental part. The impacts of antenna parameters, excitation frequency on the voltage were discussed in the theoretical part. And the influence of the length of the metal ring on the voltage was proved in the experimental part. Through the analysis of various factors, engineering and technical personnel can use the effective transmission line method to choose rational incentives used by the device size parameters, which are optimized for the purpose of the antenna size. Based on the data collected, a number of deficiencies in the process of theoretical analysis were given.

关 键 词：随钻测量 电磁波 信道计算 等效传输线法 

分 类 号：P631[天文地球—地质矿产勘探]