Nigeria’s NNPC Makes The World's 25 Biggest Oil Companies

Love em or hate em, oil and natural gas companies keep the world running, and will for many years to come. The following 2012 ranking of the world's biggest is based on the combined volumes of oil and natural gas that these companies produce each day.

1. Saudi Aramco - 12.5 million barrels per day

2. Gazprom - 9.7 million barrels per day

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

4. ExxonMobil - 5.3 million barrels per day

5. PetroChina - 4.4 million barrels per day

6. BP - 4.1 million barrels per day

7. Royal Dutch Shell - 3.9 million barrels per day

8. Pemex - 3.6 million barrels per day

9. Chevron - 3.5 million barrels per day

10. Kuwait Petroleum Corp. - 3.2 million barrels per day

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

12. Sonatrach - 2.7 million barrels per day

13. Total - 2.7 million barrels per day

14. Petrobras - 2.6 million barrels per day

15. Rosneft - 2.6 million barrels per day

16. Iraqi Oil Ministry - 2.3 million barrels per day

17. Qatar Petroleum - 2.3 million barrels per day

18. Lukoil - 2.2 million barrels per day

19. Eni - 2.2 million barrels per day

20. Statoil - 2.1 million barrels per day

21. ConocoPhillips - 2 million barrels per day

22. Petroleos de Venezuela - 1.9 million barrels per day

23. Sinopec - 1.6 million barrels per day

24. Nigerian National Petroleum - 1.4 million barrels per day

25. Petronas - 1.4 million barrels per day

Source.