器件参数对核磁测井仪的频率特性影响  

The device parameters affect the frequency characteristics of the Nlog

作　　者：卢亚普 王玉玲[2] 魏涛 霍丹丹 刘秀庆 林涛 Lu Yapu;Wang Yuling;Wei Tao;Huo Dandan;Liu Xiuqing;Lin Tao

机构地区：[1]中油测井制造公司 [2]大庆钻探工程公司录井一公司

出　　处：《国外测井技术》2024年第2期54-60,2,共8页World Well Logging Technology

摘　　要：频率特性是核磁测井仪的一个重要参数,其准确性、一致性关系到所测地层油气信息的真实性;随着多频共振核磁仪器产量的增加,仪器频率一致性较差的问题暴露出来了。首先,介绍了核磁仪器的测井原理,由电容储能短节、电子线路短节和探头短节三部分组成,并对各自的功能及作用进行了分析。其次,通过对信号流程的分析,确定发射滤波电路、天线接口电路及探头等三部分电路,是影响仪器频率参数的关键电路。测试结果表明,电路中使用的电感、电容和场效应管等器件的参数,对仪器的频率参数影响明显;选用参数合适的器件,可以明显缩小频率参数的差异,提高仪器的频率一致性。Frequency characteristic is an important parameter of MRIlogging,its accuracy and consistency are related to the authenticity of the output of multi-frequency resonance nuclear magnetic instrument,the problem of poor frequency consistency is exposed.Firstly,the logging principle of MRI instrument is introduced of capacitor energy storage,electronic circuit and probe,and theirfunctions and functions are analyzed.Secondly,through the analysis of the signal process,the three-part circuits of the transmission filter circuit,the antenna interface circuit and the probe are determined,which are the key circuits affecting the frequency parameters of the instrument.The test results show that the parameters of inductance,capacitor and field effect tube used in the circuit obviously affect the frequency parameters of the instrument;selecting devices with appropriate parameters can significantly reduce the difference of frequency parameters and improve the frequency consistency of the instrument.

关 键 词：多频共振核磁 频率 滤波 谐振 

分 类 号：TE[石油与天然气工程]