BHA轴向磁干扰对方位测量误差的影响——基于人工磁场模拟方法  

Effect of BHA axial magnetic interference on the azimuth measurement error:a simulation method based on artificial magnetic field

作　　者：孟卓然 Meng Zhuoran(Logging While Drilling Center,China Petroleum Logging Co.,Ltd.,Shaanxi Xi'an 710054,China)

机构地区：[1]中国石油集团测井有限公司随钻测井中心,陕西西安710054

出　　处：《石油学报》2020年第8期1011-1018,共8页Acta Petrolei Sinica

基　　金：国家科技重大专项“随钻地层评价成像测井系列”(2017ZX05019-002);中国石油天然气集团有限公司重大专项“近钻头伽马电阻率成像随钻测井系统研发”(2018E-2107)资助。

摘　　要：井下钻具组合(BHA)磁化形成的轴向磁场干扰是定向组件磁方位测量的一个重要的误差因素。为了对该误差因素进行独立分析,建立了大型三轴亥姆霍兹线圈人工磁场系统作为研究环境,使用不同磁通量的多个磁化组件作为干扰源研究在理想环境中轴向干扰磁场对定向组件的影响,并在此基础上提出了一种估算磁化组件磁极强度和校正轴向干扰的方法,通过改变空间姿态和三轴亥姆霍兹线圈磁场强度,分析了在不同井斜角、方位角和磁倾角的井眼轨迹中,轴向磁干扰对定向组件方位测量误差的影响,最后证明了校正磁性组件的轴向干扰方法,可以有效地提升BHA定向组件的方位测量精度。The axial magnetic interference formed by the magnetization of bottom hole assembly(BHA)is an important error factor for the magnetic azimuth measurement of directional components.To independently analyze the error factor,this study establishes a large-scale triaxial Helmholtz coil artificial magnetic field system as the research environment,uses multiple magnetized components with different magnetic flux as the interference sources,and investigates the impact of axial interfering magnetic field on directional components in an ideal environment.On this basis,this study proposes a method for estimating the magnetic pole strength of magnetized components and correcting the axial interference,and by changing the spatial attitude and the magnetic field strength of triaxial Helmholtz coil,analyzes the effect of axial magnetic interference on errors in the azimuth measurement of directional components in the well trajectories with various inclination,azimuth and magnetic dip angle.Finally,it is proved that the method for correcting the axial interference of magnetic components can effectively improve the accuracy of azimuth measurement of the BHA directional component.

关 键 词：三轴亥姆霍兹线圈 轴向磁干扰 定向测量 磁倾角 井眼轨迹 

分 类 号：TE271[石油与天然气工程—油气井工程]