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在定向井的斜井段进行开窗侧钻时，可利用开窗点的原方位作参照物来修正有磁环境对磁力测斜仪的干扰，从而用磁力测斜仪来代替陀螺测斜仪进行开窗定向。江苏油田真１４８井的钻井实践证明，利用该方法不但能提高定向准确性而且可降低侧钻成本。
When the side-drilled window of the directional well is used to open the window, the interference of the magnetic environment on the magnetic inclinometer can be corrected by using the original position of the window opening as reference to replace the gyro inclinometer with the magnetic inclinometer Open the window orientation. The drilling practice of Zhen 148 Well in Jiangsu Oilfield has proved that this method can not only improve the directional accuracy but also reduce the cost of sidetracking.