We are unlikely to ever run out of oil, it is more a case of it is just not economical to extract the oil that remains.
http://www.imeche.org/knowledge/themes/e...il-run-out
There are also likely to new reserves identified in the future such as those in Canada and possibly the Falklands:
http://www.imeche.org/knowledge/themes/e...ew-sources
But also we really do not know what other reserves may be hidden away in parts of Africa, Asia, Russia, China etc. Yes all the easy extraction stuff will be gone, but there will be other undiscovered oil fields waiting to be tapped into, this is likely to more than sufficient for the likes of medicines etc if we can just focus on alternative fuels for power and transport etc......