磁力随钻测量磁干扰校正方法研究 |
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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. |
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作者姓名: | 许昊东 黄根炉 张 然 韦红术 程锋瑞 |
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作者单位: | 1.中国石油大学(华东)石油工程学院,山东青岛 266580; |
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基金项目: | 中海石油有限公司科技攻关项目“陆丰低渗油气藏测试工程联作关键技术研究”(编号:CCL2012SZPS0005)资助 |
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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。
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关 键 词: | 径向磁干扰 钻柱磁化 轴向磁干扰 方位角 |
收稿时间: | 2013-03-14 |
Method of Magnetic Interference Correction in Survey with Magnetic MWD |
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Affiliation: | 1.School of Petroleum Engineering, China University of Petroleum(Huadong), Qingdao, Shandong, 266580, China;2.Drilling Department, CNPC Amudarya Petroleum Company Ltd., Beijing, 102206, China;3.Shenzhen Branch, CNOOC, Shenzhen, Guangdong, 518000, China |
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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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