ENERGY - The World's 25 Biggest Oil Companies

1. Saudi Aramco - 12.5 million barrels per day

Saudi Aramco is by far the biggest energy company in the world, generating more than $1 billion a day in revenues.

2. Gazprom - 9.7 million barrels per day

Russia's Gazprom is the world's largest producer of natural gas. Profits are more than $40 billion a year

3. National Iranian Oil Co. - 6.4 million barrels per day

4. ExxonMobil - 5.3 million barrels per day - $40 billion in annual profits 

5. PetroChina - 4.4 million barrels per day

6. BP - 4.1 million barrels per day -BP may not maintain its 4.1 million barrels per day for long; it is in talks to sell its 50% stake in Russian venture TNK-BP, which provides a quarter of production. 

7. Royal Dutch Shell - 3.9 million barrels per day

8. Pemex Mexico- 3.6 million barrels per day

9. Chevron - 3.5 million barrels per day

10. Kuwait Petroleum Corp. - 3.2 million barrels per day -Kurwait's biggest field, Burgan, continues to be operated by Chevron

11. Abu Dhabi National Oil Co. - 2.9 million barrels per day

12. Sonatrach - 2.7 million barrels per day

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