Worker lengthen a drill at Priobskoye oil field, some 100 km from the Siberian town of Khanty-Mansiysk, March 22, 2005. Priobskoye was a jewel field in the crown of oil firm Yugansk, formerly a key oil producing unit of oil major YUKOS. Yugansk was re-nationalised last December to recover YUKOS's back taxes and is now controlled by state oil firm Rosneft. Picture taken March 22, 2005. REUTERS/Sergei Karpukhin CVI/SM