The United States Coastguard (USCG) and Bureau of Safety and Environmental Enforcement (BSEE) have each published a joint Safety Alert relating to the reasons for a drillship’s unsuccessful attempts to avoid a hurricane.
The Joint Safety Alert addresses an extreme weather event involving a Mobile Offshore Drilling Unit (MODU) conducting well operations in the Gulf of Mexico. The MODU, with 115 personnel onboard, lost 11 marine riser joints and a lower marine riser package (LMRP) and polluted the Gulf of Mexico with 88 barrels of miscellaneous fluids in its failed attempt to evacuate the area and evade Hurricane Ida.
The BSEE investigation concluded that:
- The operator and contractor representatives failed to promptly start Temporary Abandonment (TA) procedures. The temporary abandonment was delayed as the operator and contractor jointly decided to conduct a crew change during an operation and reduced staffing and time constraints;
- Over-torqued bolts and equipment breakdowns prevented the drill crew from retrieving the marine riser and LMRP, causing further delays;
- The MODU’s Master stopped work so the crew could make storm preparations, such as placing covers on riser hatches. The Master and marine crew maneuvered the MODU with 12 riser joints and LMRP still hanging under the moonpool at speeds between 1 and 3.5 knots. Still, they could not evade Category 2+ hurricane-force wind and high/rough seas. The riser subsequently broke just below the rotary sending 11 riser joints and LMRP to the seafloor.
The Coast Guard and BSEE have issued the Safety Alert jointly to highlight the importance of risk-based operational planning and preparation when addressing extreme weather events. Among the recommendations offered by the USCG and BSEE are:
- Ensure all considerations and associated risks are documented and discussed with the operations team;
- Determine a “decision time” to act in the face of an extreme weather event. The decision to continue operations should not depend on a forecast track to the asset location. Don’t wait on a definitive weather forecast to react;
- Document contingencies for when extreme weather conditions cannot be evaded or when evacuation is impossible. Ensure Hurricane Plans or Extreme Weather Plans are up to date; identify search and rescue assets available to conduct a mass evacuation of personnel;
- Review Extreme Weather Plans before hurricane season to verify which plan takes precedence and reflects actual company operations and practices. Also, discuss documents with involved personnel, and identify and correct any training gaps.
Members may wish to refer to:
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