My brotheris fairly high up in BP and was explaining alot of it to me and from what I gathered. The north sea oil drilled by the uk costs around 40$ a barrel to drill, when prices get very low then its not worth the effort to drill it. At present Fracking which is the new thing costs around $80 to make and the Saudis and others in the OPEC cartel are worried about how much it will hit their econemy in the long run so they have pushed the price of oil down below fracking prices to drive the fracking companies out of business. The middle east can support the low prices at present but once the Frackers are out of business (unless the US goverment supports them) then prices will go back up. That's my understanding of it all. Oh and I think it only costs the Saudi's $12 a barrel to produce Oil.