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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.
2) Gazprom
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.
3) National Iranian Oil Co.
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.
4) ExxonMobil
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.
5) PetroChina
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

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