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A heavy，thick-walled tube，usually steel，used between the drill pipe and the bit in the drill stem to weight the bit in order to improve its performance is called a ______.
A.heavy-walled drill pipe
B.tool joint
C.down hole tool
D.drill collar
参考答案
更多 “ A heavy，thick-walled tube，usually steel，used between the drill pipe and the bit in the drill stem to weight the bit in order to improve its performance is called a ______.A.heavy-walled drill pipeB.tool jointC.down hole toolD.drill collar ” 相关考题
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