Types of Raw-natural-gas Wells
Raw natural gas comes primarily from any one of three types of wells: crude oil wells, gas wells, and condensate wells.
Natural gas that comes from crude oil wells is typically termed associated gas. This gas can have existed as a gas cap above the crude oil in the underground formation, or could have been dissolved in the crude oil.
Natural gas from gas wells and from condensate wells, in which there is little or no crude oil, is termed non-associated gas. Gas wells typically produce only raw natural gas, while condensate wells produce raw natural gas along with other low molecular weight hydrocarbons. Those that are liquid at ambient conditions (i.e., pentane and heavier) are called natural gas condensate (sometimes also called natural gasoline or simply condensate).
Natural gas is termed sweet gas when relatively free of hydrogen sulfide; however, gas that does contain hydrogen sulfide is called sour gas. Natural gas, or any other gas mixture, containing significant quantities of hydrogen sulfide, carbon dioxide, or similar acidic gases is termed acid gas
Raw natural gas can also come from methane deposits in the pores of coal seams, and especially in a more concentrated state of adsorption onto the surface of the coal itself. Such gas is referred to as coalbed gas or coalbed methane (coal seam gas in Australia). Coalbed gas has become an important source of energy in recent decades.
Read more about this topic: Natural-gas Processing
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