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
History of oil in California through 1930 the west coast of both Americas." During this same period, California’s agriculture and manufacturing markets were also expanding rapidly, and the increased oil production helped to power the development of these industries. However, the development of increased oil production in California had consequences. The additional California oil fields—along with booming oil supplies in Texas from Spindletop—resulted in another surplus of oil reaching the market, again impacting the price of the commodity. With the accelerated oil drillings, the price of oil in the 1920s fell from $28 per barrel to below $10 per barrel. The issue became an increasingly debated topic