The world oil and gas market is constantly changing. In particular, the euphoria over the shale gas was gone down the in the past time. It is obvious that the shale oil and gas production is accessible only to the big countries with a big territory. If in average 300 wells are needed to extract one barrel of oil, for extraction of the same volume of oil from the shale one needs 10,000 wells. There are also many other technological problems. Acco...

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