Alert 09 – 07 Failed “O” Rings Result in Dropped Drill String


The rig operation was back reaming. During this operation, the air supply to the drum clutch of the draw works suddenly bled off, resulting in the top drive along with the drill string to moving down approximately 10 feet (4-meters). The drill pipe elevator came in contact with the rotary table resulting in damage to the bails and the link tilt hydraulic cylinders.

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