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.