单词 | drill collar |
释义 | drill collar in the Oil and Gas Industry (drɪl kɒlər) Word forms: (regular plural) drill collars noun (Extractive engineering: Field development, Equipment) drillA drill collar is a thick tubular piece at the bottom of a drillpipe, which concentrates the weight on the rotating drill bit. The drill collar is a heavy, tubular connector between drillpipe and a bit. The drill collar is used to concentrate a heavy mass near the lower end of the drill column. A drill collar is a thick tubular piece at the bottom of a drillpipe, which concentrates the weighton the rotating drill bit. |
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