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中文摘要：
目前钻调整井、加密井和丛式井已经成为各油田增产增效的重要措施。井网密度的增大导致井间距的减小,邻井套管产生的磁干扰影响愈发显著。为此,采用圆柱坐标系,建立了套管在地磁场磁化的磁场模型,从水平磁化场和竖直磁化场2方面研究了地磁场中竖直套管周围磁场分布规律。研究结果表明,半径小于0.5 m的范围内,水平磁化场Hh检测出区别,Hh的极大值出现在0°和180°方位线上,随着半径增大,磁场强度迅速衰减为地磁场大小,Hh的极小值出现在90°和270°方位线上,随着半径增大,磁场强度迅速增大为地磁场大小;H总的变化规律与Hh一致,峰值有所增大。采用套管短节中心水平面的磁场数据对理论模型进行了验证,表明所建模型与试验规律具有较好的符合性。研究结果可为后续已知磁场分布获得空间位置的反演研究打下基础,从而可以更好地指导钻井,防止井眼碰撞。
英文摘要：
Currently,adjustment wells,infill wells and cluster wells are of great importance for production and efficiency enhancement in different oilfields. Higher densities of well patterns will inevitably lead to reductions in spaces among wells,and consequently,magnetic interferences generated by neighboring casing may become more outstanding. Accordingly,cylindrical-coordinate system has been used to construct magnetic field model for geomagnetic field magnetization of casing,in order to determine distribution of magnetic fields around vertical casing in geomagnetic field in horizontal magnetization field and vertical magnetization field,respectively. Research results show that horizontal magnetization fields,Hh,within radius less than 0. 5 m displayed certain differences,with the maximum Hh on the 0° and 180° azimuth lines. With increases of radius,magnetic field intensity rapidly attenuates to the intensity of geomagnetic field with minimum Hh on the 90° and 270° azimuth lines. With further increases of radius,magnetic field intensity rapidly increases to the intensity of geomagnetic field. The changes of total magnetic field Ht coincided well with changes of Hh with peak values increased slightly. Magnetic field data on horizontal plane of the casing sub have been used to verify the theoretical model. Test results show that the model has high conformity with the testing rules observed. The research results can be used to provide better guidance for drilling operations and protect boreholes from collision.
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