6. PetroChina – 4 million barrels per day
PetroChina is a state owned Chinese company with a massive annual revenue of 2 trillion Chinese Yen. This mega company has an oil production of 4.0 million barrels per day. While in 2005 it had a production figure of 2.6 million bpd. PetroChina has the highest number of employees on this list with a tremendous figure of 552,800.
=4. Rosneft – 4.7 million barrels per day
Rosneft is the only company in this list whose Oil production took a tremendous hike over the decade from 0.3 million to 4.7 Million barrels per day. With its Headquarter located in Moscow, Russia, Rosneft has Annual revenue of $ 102 Billion.