drilling column

drilling column

[′dril·iŋ ‚käl·əm]
(engineering)
The column of drill rods, with the drill bit attached to the end.
References in periodicals archive ?
Column tops: similar design and color of cast stone Column piers below grade: depth TBD at time of drilling Column brick: similar or same brick and cast stone used at Gateway & Medal of Honor Park etc.
An oil well blowout is the term for an uncontrolled flow of oil from a well into the air, resulting when the pressure in the ground exceeds the pressure in the drilling column.
The methane gas shot up through the drilling column and out on the platform of the Deepwater Horizon - before igniting, exploding and engulfing the rig in flames.