Biggest oil companies in north america
The biggest oil and gas producer of the country, PetroChina produced 1.1 billion barrels of oil and gas-equivalent in the first three quarters of 2018, which was a 2.2% increase compared with the same period in 2017. The company’s marketable gas output increased by 4.8% to 2.66 trillion cubic feet (tcf) during the same period.