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
Barrel (unit) Latin/Teutonic root "fat" (for example "vat" or "Fass"). In other commercial connections, barrel sizes such as beer keg volumes also are standardised in many countries. Some products have a standard weight or volume that constitutes a barrel: Fluid barrels vary depending on what is being measured and where. In the UK a beer barrel is . In the US most fluid barrels (apart from oil) are (half a hogshead), but a beer barrel is . The size of beer kegs in the US is based loosely on fractions of the US beer barrel. When referring to beer barrels or kegs