由于孔深。
Well body track curve can be drawn out through surveying the depth in the hole.
通过对井筒不同深度的测量，即可得出井身轨迹曲线。
Lock in the blade of hole cutter, to make sure that per depth is consistent.
锁于开洞器的刀片上，确保每次开洞深度一致。
Lock in the blade of hole cutter, to make sure that per depth is consistent.
锁于开洞器的刀片上，确保每次开洞深度一致。
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