It still is a difficult subject for most drilling engineers to predict and control well path by applying the mechanical analysis of bottom hole assembly and the rock-bit interaction model.
利用下部钻具力学分析和钻头与地层相互作用模型来预测和控制井眼轨道对于大多数钻井作业来说仍是一个难题。
Most drilling in metal is done with a twist drill.
大多数金属钻孔用的是麻花钻头。
Most drilling in metal is done with a twist drill.
大多数金属钻孔用的是麻花钻头。
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