Viscous oil is recovered from a subterranean, viscous oil-containing formation by a steam flooding technique wherein steam is generated in a downhole steam generator located in an injection well by spontaneous combustion of a pressurized mixture of a water-soluble fuel such as sugars and alcohols dissolved...http://www.google.com/patents/US4478280?utm_source=gb-gplus-sharePatent US4478280 - Steam drive oil recovery method utilizing a downhole steam generator
