许昊东, 黄根炉, 张然, 韦红术, 程锋瑞. 磁力随钻测量磁干扰校正方法研究[J]. 石油钻探技术, 2014, 42(2): 102-106. DOI: 10.3969/j.issn.1001-0890.2014.02.020
引用本文: 许昊东, 黄根炉, 张然, 韦红术, 程锋瑞. 磁力随钻测量磁干扰校正方法研究[J]. 石油钻探技术, 2014, 42(2): 102-106. DOI: 10.3969/j.issn.1001-0890.2014.02.020
Xu Haodong, Huang Genlu, Zhang Ran, Wei Hongshu, Cheng Fengrui. Method of Magnetic Interference Correction in Survey with Magnetic MWD[J]. Petroleum Drilling Techniques, 2014, 42(2): 102-106. DOI: 10.3969/j.issn.1001-0890.2014.02.020
Citation: Xu Haodong, Huang Genlu, Zhang Ran, Wei Hongshu, Cheng Fengrui. Method of Magnetic Interference Correction in Survey with Magnetic MWD[J]. Petroleum Drilling Techniques, 2014, 42(2): 102-106. DOI: 10.3969/j.issn.1001-0890.2014.02.020

磁力随钻测量磁干扰校正方法研究

Method of Magnetic Interference Correction in Survey with Magnetic MWD

  • 摘要: 为提高磁力随钻测量的井眼轨迹精度,研究了随钻测量磁干扰校正方法。利用随钻测量参数,计算井斜角、工具面角和方位角;采取360°旋转钻柱记录、分析径向磁力计读数的方法,纠正磁热点引起的径向磁干扰;采用循环迭代的方法,纠正钻柱磁化引起的轴向磁干扰。通过仿真测量参数、磁干扰数据和地磁参数,应用磁干扰校正方法计算得到校正方位角,并与实测方位角、真实方位角进行了对比,结果发现,在其他井眼参数保持不变的条件下,井斜角接近90°或方位角接近90°、270°时,实测方位角误差变大;井斜角接近0°或方位角接近0°、180°时,实测方位角误差变小;真实方位角为0°~180°时,实测方位角比真实方位角小,真实方位角为180°~360°时,实测方位角比真实方位角大;井眼轨迹接近水平东或水平西方向时,轴向磁干扰的校正效果最差。磁干扰校正方法能够提高方位角测量精度,减少无磁钻铤长度。

     

    Abstract: In order to improve accuracy of well trajectory measured by MWD,magnetic interference correction was studied.Inclination angle,tool-face and azimuth angle were worked out when surveying with magnetic MWD.Cross-axial magnetic interference originating from magnetic hot spots in the NMDC was corrected by rotating drillstring 360° and analyzing cross-axial magnetometer data.Axial magnetic interference originates from the magnetization of ferromagnetic portions of the drill string was corrected by loop iteration method.A series of conclusions were reached by a group of simulation data including survey data,magnetic interference data and geomagnetic parameters:the error of measured azimuth was larger when inclination approaches 90° or azimuth approaches 90°,270°;the error of measured azimuth was smaller when inclination approaches 0° or azimuth approaches 0°,180°;the measured azimuth was smaller than true azimuth when true azimuth was between 0° and 180°;the measured azimuth was larger than true azimuth when true azimuth was between 180° and 360°;the effect of correcting axial magnetic interference was poorer when trajectory approaches horizontal west or east and the correcting algorithm was stable.

     

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