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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.
Today, PetroChina is one of the world's largest companies by market capitalization. It is also China's largest producer of oil and natural gas. Last year, the company's output from production included 932.9 million barrels of oil, as well as 2.8 trillion cubic feet of natural gas.