Distinguish between primary and secondary extraction of oil.

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Distinguish between primary and secondary extraction of oil.



Answer: Once oil deposits have been identified, exploratory drilling is conducted to determine the quantity of oil that may be available. Initial drilling and pumping of the oil (called primary extraction) is not very efficient, leaving as much as two-thirds of the oil in the ground and so secondary extraction is required which uses solvents or water to flush out the remaining oil.

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