Tar – the term ‘natural tar’ is sometimes used for heavy petroleum (bitumen) that has penetrated to the surface of the Earth; heavy residues discharged from gases during gasification of coal and wood, feedstock for chemical industry; deposits in chimneys where furnaces are fed with coal or wood.
Technical gases – gases for miscellaneous industrial use which is not related to energy, medicine, traffic, laboratories, etc.: oxygen, argon, nitrogen, hydrogen, carbon dioxide, acetylene, helium, etc; mostly delivered under pressure in steel cylinders, then in special tanks, and some liquefied.
Terrestrial gas – (water gas, swamp gas). Gas of biogenic origin resulting from the decomposition of organic matter in shallow beds, as well as on dumps, in swamps, etc. ; usually only methane (CH4); when it comes to the surface, it fades into the atmosphere; common name for natural gas.
Treatment of natural gas for transport – the technological operation of producing natural gas on oil/petroleum and gas fields; water, gas condensate, harmful admixtures in the natural gas and damp are separated from the mixture of natural gas, gas condensate and water, and the natural gas is delivered for further treatment (degassing), storage or directly for consumption.