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双套管钻孔法
当钻爆工作船进人施工地点锚定后,外套管靠自重下沉到水底钻孔位置的覆盖层或岩基上,由船舷固定盘和固定圈两处套住。再把内套管插人外套管内,并固定在上甲板的固定圈处。随着水位涨落,固定在船上的内套管便能在外套管中伸缩,自动适应水位变化。钻杆和钻头则穿过双套管进行钻孔。、当孔钻到设计深度后,利用钻机本身的卷扬机将钻具从双套管中取出。打开固定盘和固定圈后,双套管则可用卷扬机取出
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casing drilling
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