Not Happening
You are full of it as we say here in the states.
There is no replacement that can fit on any of the Shell platforms here in the Gulf other that the S-76. With only 52'X52' helipad with multiple obstructions.
And with a 2 hour TSA security time to any changes in manfest for any aircraft over 12,500 The 20 changes a hour Shell makes will cripple thier process with anything larger than the S76
So I guess they will shut everthing down so they can retrofit helipads that can support the S-76 replacement. At over $100 a barrel and 250,000 barrels a day here anybody want to make bets.