©  Copyright 2013 Chemical Engineering & Gas Processing Rank Rank Company 2013 2003 1 1 Saudi Aramco (Saudi Arabia) 2 2 Gazprom (Russia) 3 3 NIOC (Iran) 4 4 ExxonMobil Corp. (USA) 5 N/A Rosneft (Russia) 6 6 Royal Dutch/Shell (NL/UK) 7 9 PetroChina (China) 8 5 Pemex (Mexico) 9 8 Chevron Corp. (USA) 10 12 KPC (Kuwait) 11 7 BP (UK) 12 10 Total (France) 13 N/A Petrobras (Brazil) 14 N/A QP (Qatar) 15 14 ADNOC (UAE) 16 15 Lukoil (Russia) 17 20 MoO (Iraq) 18 11 Sonatrach (Algeria) 19 18 PDVSA (Venezuela) 20 19 Statoil (Norway) 2013 Ranking of the World's Biggest Oil Companies by David Rachovich Source: Christopher Helman, "The World's Biggest Oil Companies  2013," Forbes, November 17, 2013