ABSTRACT
Natural gas is a hydrocarbon, formed deep underground, like oil and coal. It is a mixture of several hydrocarbon gases, primarily methane (70%–90%), and heavy hydrocarbons such as ethane, propane, and butane, and carbon dioxide (0-8%), oxygen (0-0.2%), nitrogen (0-5%), hydrogen sulfide (0-5%) and traces of a few rare gases, and these figures can vary widely depending on the gas field. Natural gas is referred as ‘wet’ in its raw form, and ‘dry’ when it is almost pure methane having removed the other hydrocarbons; and ‘sour’ when it contains significant amounts of hydrogen sulfide.
