Shale oil extraction Energy estimates that the "ex-situ" processing would be economic at sustained average world oil prices above $54 per barrel and "in-situ" processing would be economic at prices above $35 per barrel. These estimates assume a return rate of 15%. Royal Dutch Shell announced in 2006 that its Shell ICP technology would realize a profit when crude oil prices are higher than $30 per barrel ($190/m), while some technologies at full-scale production assert profitability at oil prices even lower than $20 per barrel ($130/m). To increase the efficiency of oil shale retorting and by this the viability of the shale oil
Whale oil Front could be expected to use 10 gallons of whale oil a day. The oil was rubbed directly onto bare feet in order to protect them from the effects of immersion. The pursuit and use of whale oil, along with many other aspects of whaling, are discussed in Herman Melville's "Moby-Dick". In the novel, the preciousness of the substance to contemporary American society is emphasized when the fictional narrator notes that whale oil is "as rare as the milk of queens." John R. Jewitt, an Englishman who wrote a memoir about his years as a captive of the Nootka people