近钻头电阻率测量理论及响应模拟  

Theory and Response Simulation of NearBit Resistivity Measurement

作　　者：宋殿光 岳步江[2] 狄帮让[1] 范业活[3] 贺明 SONG Dianguang;YUE Bujiang;DI Bangrang;FAN Yehuo;HE Ming(College of Geophysics and Information Engineering in China University of Petroleum,Beijing 102249,China;Aerospace Science&Industry Inertial Technology CO.LTD.,Beijing 100074,China;China Research Institute of Radiowave Propagation,Xinxiang,Henan 453000,China)

机构地区：[1]中国石油大学地球物理与信息工程学院,北京102249 [2]航天科工惯性技术有限公司,北京100074 [3]中国电波传播研究所,河南新乡453000

出　　处：《测井技术》2019年第6期564-568,共5页Well Logging Technology

摘　　要：利用有限元素法仿真软件,对采用螺线环型天线的近钻头电阻率测量工具进行建模仿真.对发射源进行等效变换,建立轴对称二维和三维磁流源等效模型.利用这2种模型,分析工作频率、地层电阻率、钻铤与天线尺寸等参数对信号衰减的影响规律,并对该仪器的前向和径向探测深度以及纵向分辨率指标进行分析和评估.结果表明,螺线环型天线能有效测量钻头周边电阻率信息,2种等效模型能有效分析信号的衰减规律和仪器的探测特性.研究给出的建模方法和得到的结论对研制该类仪器和分析仪器的响应规律具有重要的指导意义.The near-bit resistivity tool with a toroid antenna is simulated using finite element simulation software.Then equivalent axisymmetric 2D and 3D magnetic flux source models are built after equivalent transformation of the toroid transmitter.And finally,using the two models,the influences of working frequency,formation resistivity and the sizes of drill collar and antenna are analyzed on signal attenuation,and the front and radial detection depth and the vertical resolution are analyzed and evaluated.The results show that the toroid antenna can effectively measure the resistivity around bit,and the two equivalent models can analyze signal attenuation and detecting characteristics.The modeling methods and the conclusion play an important role for developing this type of logging tools and analyze the response law of the tools.

关 键 词：随钻测量 近钻头电阻率 发射源等效 探测深度 纵向分辨率 有限元素法 

分 类 号：P631.84[天文地球—地质矿产勘探]