Updating the list of big oil

Updating the list of what the major oil companies in the world, earlier this month the magazine Petroleum Intelligence Weekly (PIW) released its 2011 ranking of the 50 largest oil companies, with Saudi Aramco retains the top position it has had on previous occasions . Separation of subsidiaries and acquisitions caused major changes in list, compared to previous years where the natural growth of the companies and mergers were the main reasons for changes in position.
Unlike other lists compiled by PIW compares all types of oil companies operating on the basis of size, instead of just seeing the market capitalization or some other financial measure. Oil and gas reserves, oil and gas production, sales and refinery distillation capacity: Six points should be considered.
As says Market Watch, positions this year reaffirmed the importance of the oil super as ExxonMobil, BP, Shell and Total, which kept its place among the top 10 positions. Another trend is that companies in developing countries, like China, are closer to achieving the great traditional, to grow their operations through strategic acquisitions millions.
Marking the importance that Russia continues to build in the industry, especially for its importance in terms of natural gas, Gazprom broke for the first time among the top 10 companies grandes.Se can see that the first 10 have the same proportion in relation the number of private companies and government control. In terms of private companies, it appears that tend to be traditional super tankers have operations in many countries and have considerable experience and technology level. For the public, they tend to be national oil companies in most cases are favored by having large reserves and national exploitation domain.