CAJ | 학술논문

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。
위제고자력수찬측량적정안궤적정도，연구료수찬측량자간우교정방법。이용수찬측량삼수，계산정사각、공구면각화방위각；채취360°선전찬주기록、분석경향자력계독수적방법，규정자열점인기적경향자간우；채용순배질대적방법，규정찬주자화인기적축향자간우。통과방진측량삼수、자간우수거화지자삼수，응용자간우교정방법계산득도교정방위각，병여실측방위각、진실방위각진행료대비，결과발현，재기타정안삼수보지불변적조건하，정사각접근90°혹방위각접근90°、270°시，실측방위각오차변대；정사각접근0°혹방위각접근0°、180°시，실측방위각오차변소；진실방위각위0°～180°시，실측방위각비진실방위각소，진실방위각위180°～360°시，실측방위각비진실방위각대；정안궤적접근수평동혹수평서방향시，축향자간우적교정효과최차。자간우교정방법능구제고방위각측량정도，감소무자찬정장도。
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 interfer-ence originates from the magnetization of ferromagnetic portions of the drill string was corrected by loop it-eration 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 in-clination 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 azi-muth 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 poo-rer when trajectory approaches horizontal west or east and the correcting algorithm was stable .