... near-vertical aerial photography 近垂直航空摄影术 near-vertical well 接近垂直的井 near-well-bore area 近井底地带 ...
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由于倾角仪在这种接近垂直的井中会失去效果，故工具无法参考其朝上的那端来做射孔方向定位。
Near-vertical wells have no reference to the high side of the well rendering inclinometers ineffective. To facilitate accurate gun positioning an oriented gun hanger would need to be set using a gyro.
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