The natural gas mainly exists in the oil field gas, the gas field gas, the coal bed gas, the mud volcanic gas and the biological gas. Natural gas can be divided into two kinds of non associated gas and associated gas. With oil symbiosis, with crude oil to be produced oil gas is associated gas; non associated gas including pure gas and condensate gas field two, are in the form of gas in strata. Condensate gas field from the formation of the wellhead, with the pressure drop and temperature rise, the separation of gas and liquid phase, the gas phase is condensate gas field gas, liquid phase is condensate, called condensate. [1]According to the state of natural gas reserves, it can be divided into three types: structural natural gas, water soluble natural gas and coal gas. The structure of natural gas can be divided into crude oil produced by the wet natural gas, liquid free dry natural gas.
Basic introduction: from the broad definition of natural gas, natural gas refers to all exist in nature, including all kinds of natural gas of the atmosphere, hydrosphere, biosphere and lithosphere formation. The definition of "natural gas", which has been used for a long time, is a narrow definition from the point of view of energy. The natural gas mainly exists in the oil field gas, the gas field gas, the coal bed gas, the mud volcanic gas and the biological gas. Natural gas can be divided into two kinds of non associated gas and associated gas.
Natural gas is a kind of multi component mixed gaseous fossil fuel, which is mainly composed of alkanes. It mainly exists in oil fields and natural gas fields. There is no waste residue and waste water after the combustion of natural gas. Compared with coal, oil and other energy sources, it has the advantages of safe use, high calorific value, clean and so on. Natural gas can be divided into two kinds of non associated gas and associated gas
chemical compositionThe main component of alkane gas, including methane, majority, and small amounts of ethane, propane and butane, in addition there are hydrogen sulfide, carbon dioxide and nitrogen and water vapor and a small amount of carbon monoxide and trace rare gases, such as helium and argon. Under standard conditions, methane to butane exists in a gaseous state and pentane is a liquid. Methane is the shortest and lightest hydrocarbon molecule.The organic sulfide and hydrogen sulfide (H S) is a common impurity in most cases the use of natural gas must be removed in advance. Natural gas containing sulfur impurities is described in English as "sour (acid)".
