Can't speak for all the big oil companies but one certain Dutch company we flew for in Malaysia would rather you blow the floats and ditch in the water versus landing on a rig unscheduled in the event of an emergency.
The potential loss of revenue, lives and damage to their reputation, should you screw up, far exceeded that of a helicopter ditching in the water with it's potentially "expendable" air frame, crew and occupants.
I didn't believe it until one of their resident senior aviation safety managers showed me both scenarios run through their internal risk matrix. Land as soon as possible took on an entirely different meaning..........slow, low and back to the airport. Not onto one of dozen or more platforms unannounced
Seriously..................................