When an oil field reaches the end of its life, the bulk of its oil (as much as two-thirds) is left behind in the reservoir, because it is too difficult or too expensive to be extracted. It is estimated to make up only 1% extra worldwide, equivalent 20 to 30 billion barrels of additional oil recovered. It is estimated that by 2020, EOR represent 50% of world production.

1. Lager, K.J. Webb, and I.R. Collins, and D.M. Richmond, BP, BP Exploration (Alaska), LoSal Enhanced Oil Recovery: Evidence of Enhanced Oil Recovery at the Reservoir Scale, SPE/DOE Symposium on Improved Oil Recovery, 113976-MS, April 2008, Tulsa, Oklahoma, USA.
2. L.W. Lake, R.L. Schmidt, P.B. Venuto, A Niche for Enhanced Oil Recovery in the 1990s, Oilfield Review, January 1992,55-61.
3. Shell México, Recuperación mejorada del petróleo,http://www.shell.com.mx/innovation/meeting-demand/getting-more/eor.htm

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