Z.
If the price gets high enough, it becomes worthwhile to extract the difficult stuff below the North Sea.
and indeed we are doing just that. There are some really clever steerable drill techniques to connect small pockets, injections of water and other agents and just going in stuff that was previously too deep. Above $100 or so/barrel it is worth it. But there is no denying that it is running out and one day, and quite soon, no amount of cleverness will help.
(and even a simple oil rig on land is quite complex.
http://theoildrum.com/node/5776
fracking for gas - how it is horizontal drilling done?
http://theoildrum.com/node/3808
i suggest to ignore the chatter in the comments below the main articles
)
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