Petroleum is usually located 3-4 km below sea level. Petroleum is obtained by making an artesian well. Crude oil obtained is collected in tankers or piped to a tank station or oil refinery.
Crude oil (cude oil) black viscous liquid and smelled dreadful. Crude oil can not be used as fuel or for other purposes, but must be processed first. Crude oil contains about 500 types of hydrocarbons with the number of atoms C-1 through 50. Boiling points of hydrocarbons increases with increasing number of C atoms within the molecule. Therefore, the processing is done through distillation of petroleum-rise, where crude oil is separated into groups (fractions) with a similar boiling point.
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