Natural gas before the natural gas can be transported. Natural gas extracted from oil wells is called casinghead gas (whether or not truly produced up the annulus and through a casinghead outlet) or associated gas. The natural gas industry is extracting an increasing quantity of gas from challenging resource types: sour gas, tight gas, shale gas, and coalbed methane. There is some disagreement on which country has the largest proven gas reserves. Sources that consider that Russia has by far the largest proven reserves include the US CIA (47 600 km³), the US Energy Information Administration (47 800 km³), and OPEC (48
Natural gas in Ukraine price. On 9 January 2014 Naftogaz and Russia's Gazprom signed a supplement to the Russian-Ukrainian gas contract, setting the price of natural gas for Ukraine in the first quarter of 2014 at $268.5 per 1,000 cubic meters. Ukraine remains the main transit route for Russian natural gas sold to Europe, which earns Ukraine about $3 billion a year in transit fees, making it the country’s most lucrative export service. Following Russia's launch of the Nord Stream pipeline, which bypasses Ukraine, gas transit volumes have been steadily decreasing. In 2004 more than 120 bcm of Russian gas was transported through Ukraine;