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drill string

(on a drill rig) the assemblage of drill pipes that link the drill bit to the mechanism that imparts rotary or reciprocating motion.
Origin of drill string
1695-1705 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for drill string
  • drill string safety valve was installed but could not be closed.
  • The downhole guidance probe is positioned directly behind the downhole motor, thus becoming an integral part of the drill string.
  • At the end of the drill string, at the bottom of the hole, a drill bit grind s away at the rock.
  • During drilling, elevators are used to add additional pipe to the drill string as the depth increases.
  • The gel will be pumped through the drill string and inflated packer equipped with a one-way check valve.
  • The bottom of the borehole normally heaves when the cleanout drill string is pulled back creating suction.
  • Do not tighten the chuck jaws against a moving drill string.
  • Drill pipe is the tubular member of the drill string to which tool joints are attached.
  • The operator pumps mud down the drill string while controlling the well bore pressures by using a choke at the outlet.
  • It is placed on the leading end of the rotating drill string and gradually bends the well bore until the desired angle is reached.
British Dictionary definitions for drill string

drill string

(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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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