There are twice-weekly flights to the UK now. 17 hours. How do you think argentina would stop chile receiving flights?
I've known oil workers from saudi, jordan, libya, places like this. Really grim places where you're living on an expat compound for months at a time - because the money is fantastic. Basically, they suck it up and think of the money going into their accounts. Where they go on their few days off is not really a big concern. If it was, the UK is 17 hours away.
what oil refinery/tanker facilities does argentina have? I really don't see any need to include argentina in the process of shipping the oil back to the UK (or to markets). If there was a chance of that happening, the argentine government's new permit legislation has just put paid to it. The oil will be pumped ashore to the falklands and a new depot will be built to take tankers. That's normally what happens when oil is found.