Oil recovery refers to the cleaning and recovery methods after an oil spill: Fast oil recovery See also: Bottsand-class oil recovery ship, Skimmer, Oil Spill Eater II, Oil Spill Response or a form of tertiary (sometimes: improved secondary) recovery of crude oil from primary oil reserves: Enhanced oil recovery Microbial enhanced oil recovery Solar thermal enhanced oil recovery Alternatively it may simply be used as a euphemism for: petroleum extraction and oil drilling