Safety Alert
Semi-submersible Mobile Offshore Drilling Unit (MODU) Unlatched From Well in Progress
Semi-submersible Mobile Offshore Drilling Unit (MODU) Unlatched From Well in Progress
- IADC
- Safety Alert
- IADC Alert 22-05
- Marine OperationsVessel and Mooring
- Material fatigueMechanical failure
- Mooring operations
- Mooring linesWire rope
- Upstream oil and gas
- Offshore installation
Summary
A semi-submersible drilling unit was disconnected from its well and at a survival location during a storm when two mooring wires failed. Released fairleads punctured the hull and subsequently collided, sustaining significant damage. The identified primary wire failure mechanism was high-load, low-cycle bending fatigue.
Classifications: Material fatigue; metal fatigue.
Classifications: Mechanical failure; equipment failure.
Classifications: Mooring operations; berthing; unmooring.
Classifications: Mooring lines; mooring rope; mooring wire.
Classifications: Wire rope; steel wire rope.
Classifications: Upstream oil and gas; oil and gas extraction; upstream petroleum.
Classifications: Offshore installation; offshore platform; offshore rig.
Summary
The alert concerns a semisubmersible drilling unit becoming unlatched from a well during operations.
IADC Alert 22-05. Themes: marine operations, vessel and mooring.