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2020 2nd alert HiPo#74 (Drops) Lower Tie back for torque tube broken and dropped to rig floor
While back reaming on 12 ¼’’ section with erratic torque and vibration, a piece from the lower tie back broke and dropped from the mast beam from height of 3 meters, weighing 18 Kg landing on the rig floor. Driller immediately stopped rotation and informed rig manger and DSV. Red zone was fully managed.
Ensure red zone is managed at all times. During drops inspection, check that there are no holes drilled in main beam structure. Check all NOV lower tie back for similar issue. Stop back reaming if excessive torque or vibration and report to TP and DSV.
Category:
Second Alerts
Document Type:
Safety
Format:
.pptx
Viewers:
36
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