drill pipe

(in oil-well drilling or the like) any of several coupled tubes for rotating the bit and supplying drilling mud.
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World English Dictionary
drill string or drill pipe
(in the oil industry) a pipe made of lengths of steel tubing that is attached to the drilling tool and rotates during drilling to form a bore
drill pipe or drill pipe

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Drill pipe: the heavy seamless steel tubing used to rotate the drill bit and
  circulate the drilling mud.
The drill pipe is then carefully removed from the borehole and the casing and
  screen are set in the open hole and sealed in place.
Released drill pipe sling from aft rotary and attached to drill pipe on forward
Connections between the pump and drill pipe shall be relatively leak-free.
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