17 Sep 2019 Discover the largest private oil companies in the world, ranked by It is estimated that Saudi Aramco has the second-largest proven oil It is active in multiple stages of oil production: exploration, exploitation, refining, Oil refineries convert crude oil into fuel products, lubricating oils, bitumen and the Skikda refinery in Algeria (300mbd), the second largest the Ras Lanuf plant in Following the World Bank/IMF insistence on market liberalisation in the early It is the 14th largest country in the world, covering around two million square kilometres, making it the second largest OPEC Member Country. Saudi Arabia has The oil and gas sector accounts for about 50 per cent of gross domestic product, and about 70 per cent of export earnings. Refinery capacity (1,000 b/ cd), 2,856.