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任何形式的钻头在石油和天然气钻探的井底破碎岩石过程中都会很快地磨损。为了更换磨废的钻头,便从井中将整个钻杆柱分段(立根)提取出来,这要花费许多时间。
Any type of drill bit will quickly wear away during rock bottoming of oil and gas drilling. In order to replace a worn-out drill bit, it is time-consuming to extract the entire drill string segment (stand) from the well.