Not likely - more likely is that it is in port picking up more supplies for the rig. These rigs have only a very limited amount of deck space, mud tanks, fridges and freezers for food etc so they need to be constantly resupplied, and so as soon as a supply ship has been unloaded it heads back to port to pick up more - not much point it hanging around the rig burning fuel once it has been unloaded.
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