Workers adjust the valves of oil pipes at West Qurna oilfield in Iraqs southern province of Basra November 28, 2010. U.S. oil major ExxonMobil and its partners have awarded a contract to oil services firm Schlumberger Ltd to drill 10 wells in Iraqs West Qurna Phase One oilfield, industry sources familiar with the matter said. Picture taken November 28, 2010.(Reuters)