石油化工高等学校学报2025，Vol.38Issue(2)：54-61,8.DOI:10.12422/j.issn.1006-396X.2025.02.007
考虑地下磁矿脉影响的井眼方位角校正方法
Borehole Azimuth Correction Method Considering the Effect of Underground Magnetic Veins
摘要
Abstract
In order to improve the accuracy of magnetic azimuth measurement,it is often necessary to establish a more accurate local geomagnetic model to obtain precise magnetic declination information.Compared with global geomagnetic model,local geomagnetic model contains magnetic anomaly information caused by underground magnetic ore veins at the surface.Considering the different burial depths and sizes of underground magnetic veins,their effects on magnetic declination at different borehole depths differ significantly.Therefore,it is necessary to consider the correction of the azimuth angle of medium and deep wells under the influence of underground magnetic veins.Based on ANSYS Maxwell numerical simulation software,the geomagnetic field model under the influence of magnetic veins of different burial depths and sizes was established.Through numerical simulation method and actual drilled borehole trajectory of a medium-deep well(Z well),a method of azimuth correction was given to quantitatively analyse the influence of underground magnetic veins on the azimuth and borehole trajectory.The results of the study show that the effect of underground magnetic veins on the azimuth of drilling within the 2 000 m thickness stratum is about 0.6° under the condition that the magnetic veins are buried at a depth of 2 100 m.After considering the influence of underground magnetic veins,the borehole trajectory is inevitably offset,and the offset increases with the depth of the well,which may cause off-targeting and other accidents for medium and deep wells.Therefore,it is of great significance to consider that the azimuth correction under the influence of geomagnetic veins can strongly improve the azimuth measurement accuracy and realise accurate guidance.关键词
随钻测量/磁矿脉/方位角/中深井/数值模拟Key words
Measurement while drilling(MWD)/Vein of magnetic flux/Azimuth/Medium-deep well/Numerical simulation分类
石油、天然气工程引用本文复制引用
胡贵,刘喆,刁斌斌,于瑞丰,吴华鹏,张富磊..考虑地下磁矿脉影响的井眼方位角校正方法[J].石油化工高等学校学报,2025,38(2):54-61,8.基金项目
国家自然科学基金项目(52234002,52474014). （52234002,52474014）
