井下高温高精度磁场随钻测量系统设计  

Design of High-precision Magnetic Measurement While Drilling System Applied in Downhole High Temperature Environment

作　　者：颜肖平[1] 梁华庆[1] 王志博 王龙[1] 曹旭东[1] YAN Xiao-ping;LIANG Hua-qing;WANG Zhi-bo;WANG Long;CAO Xu-dong(College of Information Science and Engineering,China University of Petroleum(Beijing),Beijing 102249,China)

机构地区：[1]中国石油大学(北京)信息科学与工程学院,北京102249

出　　处：《仪表技术与传感器》2022年第3期88-91,97,共5页Instrument Technique and Sensor

基　　金：国家科技重大专项项目(2017ZX05009-003)。

摘　　要：为了解决井下高温环境下微弱磁场的高精度测量问题,以提高在正钻井中对井眼附近磁性物质的探测距离,在分析噪声抑制方法基础上,从系统结构、高温器件选型、信号滤波与模数转换、电源稳压处理等方面进行了设计和优化。系统采用斩波技术和低噪声运算放大器降低了测量电路的固有噪声水平,选用高温三轴磁通门传感器Mag-610L及32位模数转换器ADS1282H实现了高温下磁场的高精度随钻测量。结果表明,静磁场强度测量分辨率达到0.1 nT,满足高温下测距的测量精度需求。In order to solve the problem of high-precision magnetic measurement in downhole high-temperature environment and improve the detection distance of magnetic materials near the borehole during drilling, based on the analysis of noise suppression methods, design and optimization were carried out from the aspects of system structure, high-temperature device selection, signal filtering, ADC,power supply voltage regulation processing and so on.The system used chopping technology and low-noise operational amplifiers to reduce the inherent noise level of the measurement circuit, and selected high-temperature three-axis fluxgate sensor Mag-610L and 32-bit ADS1282H to achieve high-precision magnetic measurement while drilling.The results show that the resolution of the static magnetic field reaches 0.1 nT,meeting the measurement accuracy requirements of ranging under high temperature.

关 键 词：高温 高精度 磁场 斩波技术 磁通门传感器 随钻测量 

分 类 号：P631[天文地球—地质矿产勘探] TP212[天文地球—地质学]