Enhanced Oil Recovery (EOR) is processes that can improve output from an oil well. Oil recovery is group into three levels:
Primary - Oil comes out of the ground without pumping Secondary - Oil pumped out of the ground Tertiary - Oil is removed via auxiliarly means (EOR)
Primary and Seconadary methods only extract 20-30% of the oil available in the well. Therefore a variety of methods have been devised to increase output including.