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The desert kingdom has around 16% of the worldâs proven oil reserves and is the biggest global exporter of petroleum liquids. There is little doubt as to why its national oil company, Saudi Aramco, the biggest energy company in the world, generates over $1 billion in revenue every single day.
PetroChina is the fifth largest oil and gas company in the world. It produced 916.5 million barrels of crude oil and 2.558 trillion cubic feet of natural gas in 2012. Overseas crude oil production by the company during the year stood at 136.9 million barrels.