Abstract: A well arrangement is used wherein the production wells are generally horizontal, positioned low in the reservoir and arranged generally perpendicularly to a laterally extending combustion front. The combustion front is propagated by a row of vertical air injection wells completed high in the reservoir. The open production wells function to cause the combustion front to advance along their lengths. The process is characterized by a generally upright combustion front having good vertical and lateral sweep.

Abstract: The process involves a well stimulation treatment of a hydrocarbon reservoir containing solid pyrobitumen. A strong oxidant, preferably sodium hypochlorite, is injected into the reservoir as an aqueous solution containing 5 wt. % or higher concentration of the oxidant. The oxidant is retained in contact with the formation for a predetermined retention period and the well is then backflowed or pumped to remove oxidation products. The permeability of the reservoir is improved, apparently by conversion of the solid pyrobitumen to removable gaseous and liquid products.

Abstract: The recovery of oil from a subterranean hydrocarbon-bearing reservoir by the injection thereinto of a mixture of carbon dioxide and sulfur dioxide which is miscible with the reservoir oil at pressure and temperature prevailing in the reservoir. For production a driving fluid is then injected to displace the zone and reservoir oil and fluids for recovery.