1.) Saudi Aramco
Saudi Aramco, a fully integrated, global petroleum and chemicals enterprise, is the state-owned oil company of the Kingdom of Saudi Arabia. During their 80-year history they have become a world leader in hydrocarbons exploration, production, refining, distribution, shipping and marketing, and the world’s top exporter of crude oil and natural gas liquids (NGLs).
The company manages proven conventional crude oil and condensate reserves of 260.2 billion barrels. Their average daily crude production in 2012 was 9.5 million barrels per day (bpd). Saudi Aramco and its subsidiaries own or have equity interest in domestic and international refineries with a total worldwide refining capacity of almost 4.5 million bpd, of which their equity share is 2.4 million bpd, making them the world’s sixth-largest refiner.
Gazprom is a global energy company with an average daily crude production of 9.7 million barrels per day. Its major business lines are geological exploration, production, transportation, storage, processing and sales of gas, gas condensate and oil, sales of gas as a vehicle fuel as well as generation and marketing of heat and electric power. The company holds the world’s largest natural gas reserves. Gazprom accounts for 14 percent of the global and 74 percent of the Russian gas output, respectively.
Since 1951, National Iranian Oil Company (NIOC) has been directing and making policies for exploration, drilling, production, research and development, refining, distribution and export of oil, gas, petroleum products. NIOC, with a vast amount of oil and gas resources, is one of the world’s largest oil companies. At the present time, it is estimated that the company holds 156.53 billion barrels of liquid hydrocarbons and 33.79 trillion cubic meters of natural gas. The company has an average daily crude production of 6.4 million barrels per day.
ExxonMobil is the world’s largest publicly traded international oil and gas company. The company holds an industry-leading inventory of global oil and gas resources and has an average daily crude production of 5.3 million barrels per day. They are the world’s largest refiner and marketer of petroleum products, and their chemical company ranks among the world’s largest. They operate in most of the world's countries and are best known by the familiar brand names: Exxon, Esso, and Mobil.
PetroChina Co. Ltd., is the largest oil and gas producer and distributor, playing a dominant role in the oil and gas industry in China. It is not only one of the companies with the biggest sales revenue in China, but also one of the largest oil companies in the world. PetroChina was established as a joint stock company with limited liabilities by China National Petroleum Corp. under the Company Law and the Special Regulations on the Overseas Offering and Listing of Shares by Joint Stock Limited Companies in 1999. The company has an average daily crude production of 4.4 million barrels per day.
BP is one of the world's leading international oil and gas companies with an average daily crude production of 4.1 million barrels per day. The company provides customers with fuel for transportation, energy for heat and light, lubricants to keep engines moving, and the petrochemicals products used to make everyday items as diverse as paints, clothes and packaging. Their upstream segment is responsible for activities in oil and natural gas exploration, field development and production. Their downstream segment is the product and service-led arm of BP, focused on fuels, lubricants and petrochemicals.
Shell is a global group of energy and petrochemical companies with an average daily crude production of 3.9 million barrels per day. Their upstream segment is focused on exploring for new oil and gas reserves and developing major projects where their technology and know-how adds value to the resource holders. Their downstream emphasis remains on sustained cash generation from existing assets and selective investments in growth markets. The company has spent $2.2 billion on developing alternative energies, carbon capture and storage, and CO2-related R&D over the past five years.
Mexico's state oil company Pemex is engaged in the exploration, production, transportation, refining, storage and sale of hydrocarbons and derivatives. The company produces an average daily crude production of 3.6 million barrels per day. Its products include petrochemicals, natural gas, liquid gas, sulphur, gasoline, kerosene, and diesel. Pemex operates 344 production fields; 6,382 production wells; 225 off-shore platforms; six refineries; eight petrochemical complexes; 7,896km of gas pipelines; 4,548km of oil pipelines; and 19 LPG distribution terminals.
Chevron has an average daily crude production of 3.5 million barrels per day. Chevron had a global refining capacity of 1.95 million barrels of oil per day at the end of 2012. The company explores for, produces and transports crude oil and natural gas; refines, markets and distributes transportation fuels and lubricants; manufactures and sells petrochemical products; generates power and produces geothermal energy; provides renewable energy and develops research for advanced biofuels.
10.) Kuwait Petroleum Corp.
Kuwait Petroleum Corp. is the state-owned entity responsible for Kuwait's hydrocarbon interests throughout the world. The company has an average daily crude production of 3.2 million barrels per day. As part of the global energy industry, they supply the world with oil and gas needs by exploring for, producing, refining, transporting and marketing these precious natural resources both in their home country and internationally. They have plans to launch strategic projects such as the Nghi Son Vietnam Refinery and Petrochemical Complex, the Clean Fuel Project and the New Refinery Project,as part of their upstream activities.