Top 5 Petroleum Companies

Business: World Top 5 Petroleum Companies : 

Top 1: Saudi Aramco is the state-owned national oil company of Saudi Arabia. It is the largest oil corporation in the world with the largest proven crude oil reserves and production. Headquartered in Dhahran, Saudi Arabia, Saudi Aramco also operates the world's largest single hydrocarbon network, the Master Gas System. It was known as just Aramco between the years of 1933-1988, an acronym for Arabian American Oil Company.


As of the end of 2006, its yearly production of only crude oil neared 3.4 billion barrels (540,000,000 m3) and it managed over 100 oil and gas fields in Saudi Arabia totaling at least 264 billion barrels (4.20×1010 m3) of oil reserves and 253 quadrillion scf of gas reserves.
Among those fields fully owned by the company is the Ghawar Field, the world's largest oil field; the Safaniya Field, the world's largest offshore field; and the Shaybah Field, one of the world's largest of its kind. It is thought to be by far the world's most profitable company.
Top2: The National Iranian Oil Company (NIOC) , under the direction of the Ministry of Petroleum of Iran, is an oil and natural gas producer and distributor headquartered in Tehran. It was established in 1951.
According to OPEC, NIOC recoverable liquid hydrocarbon reserves at the end of 2006 was 138,4 billion barrels.
In April 2006 the Fars News Agency reported that Iran has begun plans to create an SPR. The National Iranian Oil Company (NIOC) has begun construction of 15 crude oil storage tanks with a planned capacity of 10 million barrels.

NIOC holds about 1,000×10^12 cu ft (28,000 km3) of proven Natural gas reserves of which 36% are as associated gas and 64% is in non associated gas fields.
The company is completely owned by Iranian government. NIOC's General Assembly consisting of the President, Vice President, Director General of the Management and Planning Organization, Ministers of Oil, Energy, Industries and Mines, Labor and Social Affairs, Economy and Finance is its highest decision marking body, determining the company's general policy guide lines, and approving the annual budgets, operations and financial statements and balance sheets. The company's Board of Directors has the authority and major responsibilities to approve the operational schemes within the general framework ratified by the General Assembly, approve transactions and contracts, and prepare budgets and Board reports and annual balance sheets for presentation to the General Assembly.
The Board supervises the implementation of general policy guidelines defined by the General Assembly, and pursues executive operations via the company's Managing Director.
Top3: The Exxon Mobil Corporation, or ExxonMobil, is an American oil and gas corporation. It is a direct descendant of John D. Rockefeller's Standard Oil company, and was formed on November 30, 1999, by the merger of Exxon and Mobil.
Exxon Mobil's reserves were 72 billion oil-equivalent barrels at the end of 2007 and, at current rates of production, are expected to last over 14 years. The company has 38 oil refineries in 21 countries constituting a combined daily refining capacity of 6.3 million barrels.
While it is the largest of the six oil supermajors with daily production of 3.921 million BOE (barrels of oil equivalent) in 2008, this is only approximately 3% of world production and ExxonMobil's daily production is surpassed by several of the largest state-owned petroleum companies.
Top 4: Petróleos de Venezuela, S.A. (PDVSA ) [Petroleums of Venezuela] is the Venezuelan state-owned petroleum company. It has activities in exploration, production, refining and exporting oil, as well as exploration and production of natural gas. Since its founding on 1 January 1976 with the nationalization of the Venezuelan oil industry.

Venezuela has 77.5 billion barrels (1.232×1010 m3) of conventional oil reserves according to PDVSA figures, the largest in the Western Hemisphere and making up approximately half the total. This puts Venezuela as fifth in the world in proven reserves of conventional oil. By also including an estimated 235 billion barrels (3.74×1010 m3) of tar-like extra heavy crude oil in the Orinoco Belt region, Venezuela claims to hold the largest hydrocarbon reserves in the world. Venezuela also has 150 trillion cubic feet of natural gas reserves.
PDVSA has a production capacity, including the strategic associations and operating agreements, of 4 million barrels per day (600,000 m³). Officials say production is around 3.3 million barrels per day (520,000 m³/d) although most secondary sources such as OPEC and the EIA put Venezuela's output at least 500,000 barrels per day (79,000 m³/d) lower.
Top 5: China National Petroleum Corporation (CNPC) is a state-owned fuel-producing corporation and the largest integrated oil and gas company in the People's Republic of China. As of 2006.

CNPC is the government-owned parent company of public-listed PetroChina, a company created on November 5, 1999 as part of the restructuring of CNPC. In the restructuring, CNPC injected into PetroChina most of the assets and liabilities of CNPC relating to its exploration and production, refining and marketing, chemicals and natural gas businesses.
CNPC and PetroChina develop overseas assets through a joint venture, CNPC Exploration & Development Company, which is 50% owned by PetroChina. The half ownership was acquired in June 2005 by PetroChina after paying CNPC 20.74 billion yuan. Source: Wikipedia, CNPC