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 the oil shale industry in the United States process, and production was limited by the small supply of petroleum that seeped into his salt wells. On 28 August 1859, Edwin Drake discovered oil in a well 70 feet deep along Oil Creek, south of Titusville, Pennsylvania. The well made only 12 to 20 barrels per day, but the discovery set off a boom in oil drilling up and down Oil Creek, and then all down the Ohio valley, to Ohio, Kentucky, and Virginia, the same area where many shale oil retorts were located. In 1861, petroleum flooding onto the market drove the price down to US$0.52 per barrel,