FILE PHOTO: Bach Ho oil rig is seen off Vietnam's coastal Vung Tau city in this April 20, 2010 picture. Vietnam's crude oil production fell 18.8 percent in April from the same month last year to an estimated 1.15 million tonnes, or about 281,000 barrels per day, the government said on Tuesday. Picture taken on April 20, 2010. REUTERS/Stringer (VIETNAM - Tags: ENERGY BUSINESS)/File Photo