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（）.<br>A:heavy-walled drill pipe<br>B:tool joint<br>C:down hole tool<br>D:drill collar

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

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