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钻孔具有从其原有方向偏离的侧向。孔斜的主要原因是:①钻机安装产生的误差,造成开孔偏斜:②所钻岩石的结构。钻头趋向于沿层理方向和在较软的岩层中钻进;③钻头和钻杆直径之间配合不正确;④钻进操作不适当(回转速度、给进
The borehole has a lateral offset from its original orientation. Hole oblique main reason is: ① rig installation error, resulting in open hole skew: ② rock structure of the drill. The drill bit tends to drill in the bedding direction and in the softer rock formation; (3) Incorrect fit between drill bit and drill rod diameter; (4) Inappropriate drilling operation