drill column

[′dril ‚käl·əm]

(mining engineering)

A steel pipe that can be wedged across an underground opening in a vertical or horizontal position to serve as a base on which to mount a diamond or rock drill.

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But they become extremely dangerous when they build up inside the drill column of a well.

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Investigators know the explosion was triggered by a bubble of methane gas that escaped from the well and shot up the drill column, expanding quickly as it burst through several seals and barriers before igniting.

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Many believe the accident was caused by corporate negligence, as the Blowout Preventer (BOP), which sat on the seafloor connecting the well to the drill column, was supposed to prevent such an event.

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Rescued rig workers described how a bubble of methane gas escaped from the well and expanded as it shot up the drill column before exploding.