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钻柱、钻井工具及仪表 drill string, drilling tool and instrumentation
钻柱 drill string ; [机] drill stem ; drilling string
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船员们从这根钢管的顶部，一根一根地装上更多管道，直到这根“钻柱”足够长，能碰到海底。
The crew attaches new lengths of pipe one by one from the top until the “drill string” is long enough to hit the seafloor.
船员们从这根钢管的顶部，一根一根地装上更多管道，直到这根“钻柱”足够长，能碰到海底。
The crew attaches new lengths of pipe one by one from the top until the "drill string" is long enough to hit the seafloor.
立管内部核心是空心的(管中管)，留给钻柱使用。
The riser's inner hollow core (a pipe within a pipe) is reserved for the drill string.
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