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Split and merge into it. Answer by 06jcoxon. Confidence votes 42. Crude oil is extracted by drilling wells, but oil sand deposits are strip mined or made to flow into producing wells by in situ techniques which reduce the bitumen's viscosity with steam and/or solvents.
Crude oil occurs naturally as a mixture of various hydrocarbons and impurities. The refining process splits this mixture into other, more valuable mixtures such as natural gas, gasoline and chemical feedstocks, none of which are pure substances, but each of which must be separated from the raw crude.In both of these cases, a series of separations is necessary to obtain the desired end products.he purpose of a separation may be analytical, i.e. to help analyze components in the original mixture without any attempt to save the fractions, or may be preparative, i.e. to prepare fractions or samples of the components that can be saved.