金属钻铤对随钻电磁波电阻率测井仪测量信号的影响  

The Influence of Metal Mandrel on Electromagnetic Resistivity Logging Responses

作　　者：宋殿光[1,2] 段宝良[2] 魏宝君 张贵宾[1] 

机构地区：[1]中国地质大学地球物理与信息技术学院,北京100083 [2]中国电波传播研究所,河南新乡453003 [3]中国石油大学理学院,山东青岛2665580

出　　处：《测井技术》2014年第2期201-205,共5页Well Logging Technology

基　　金：教育部新世纪优秀人才支持计划(NCET-10-0767)

摘　　要：采用轴对称二维有限元方法分析了金属钻铤的电导率、凹槽及线圈尺寸等参数对随钻电磁波电阻率测井仪测量信号的影响规律。均匀介质中钻铤对仪器的响应没有影响,但非均匀介质中钻铤的存在可以减小井眼和侵入的影响;接收线圈电势随钻铤电导率的增大而减小,但增大到一定数值后电势基本保持不变;凹槽与线圈间距对信号的影响要大于凹槽长度对信号的影响程度,在仪器的实际研制中对凹槽与线圈尺寸要求严格,而对凹槽长度则只需满足工程要求即可。The Two-dimension finite element method is used to analyze the influence of parameters such as conductivity and the size of groove and loop of metal mandrel on the signal of electromagnetic propagation resistivity logging instrument. The results show that the influence of metal mandrel in homogeneous media can be ignored, but in inhomogeneous media the existence of metal mandrel can reduce the influence of borehole and invasion. The voltage of receiver becomes small as the conductivity of mandrel grows, but the change of voltage will disappear after this parameter reaches some value. The influence of the space between groove and loop is bigger than the length of groove on the signal of receiver, so in practice of developing instrument the demand to the size of groove and loop is rigorous, and the demand to the length of groove is uncritical as it can satisfy the engineering need.

关 键 词：随钻测井 电磁波电阻率 金属钻铤 钻铤凹槽 有限元素法 

分 类 号：P631.84[天文地球—地质矿产勘探]