It sounds to me that the oil drilling is in its early stages, so commercial use seems still a bit away. But one should keep in mind that the oil price kinda affects which oil fields are profitable to use. It should be remembered that when the oil price rose up 100 $ some time ago a lot of of new oil fields were suddenly "discovered". In fact most of the fields were already known, but only after the rise of the price per barrel it became profitable to make use of them. It could probably be the same for the Falklands. (Not to mention that it wouldn't make that much a difference whether you have to send you tankers all the way down to the Falklands as compared to the route to the oil producers in the Middle East... )