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Safety Alert 300 - Unplanned Emergency Disconnect Sequence (EDS) of the Lower Marine Riser Package


While the rig employees were troubleshooting a network issue on the Driller’s Blowout Preventer (BOP) control panel of an ultra-deepwater semisubmersible drilling rig, an unplanned EDS occurred. The EDS of the deepwater well resulted in: 1) closing of the casing shear rams on electric line being used for logging and 2) closing of the blind shear rams and a disconnect of the Lower Marine Riser Package (LMRP) from the BOPs.

Document Collection
Issued Date
Year Created
Safety Alert/Bulletin Number
Safety Category
BOP/LMRP Failures
Well Operations