 The decline in oil discoveries has led to increased interest in enhanced oil recovery, or, techniques. This paper reviews the current state of our technology, focusing on sandstone and carbonate reservoirs, as well as turbidite reservoirs. It also examines the risks and rewards associated with various R methods, including CO2 injection, HPAI, and chemical flooding. Finally, the economic viability of CO2-door projects is discussed. This article was offered by Vladimir Alvarado and Eduardo Manrique.