Oil recovery by in situ combustion

Details Oil recovery by in situ combustion Oil recovery by in situ combustion

E - Fixed Constructions

21

B

166/36

E21B 43/24 (2006.01) E21B 41/00 (2006.01) E21B 43/243 (2006.01) E21B 43/30 (2006.01)

Patent

CA 1206411

Abstract of the Disclosure Enhanced recovery of oil from subterranean sedi- mentary formations by an in situ combustion method employing a pattern of an injection well and several production wells, spaced apart by a treatment zone. Combustion is controlled by placing at least one fluid conduit in a treatment zone and introducing a control fluid through it to modify the flame front. Oxygen may be introduced to take over from combustion air initially introduced through the injection well, to sustain combustion and advance the flame front. Water may be injected through the injection well, alternating with the oxygen through the control conduit to continue a wet combustion method started with air. The strategic placing of control conduits and the introduction of appropriate fluids may be employed to improve the sweep geometry by advancing the flame front or retarding it, or invading areas behind it. Safety means is provided for introducing the oxygen at a velocity greater than the maximum flame velocity encountered in the flame front.

386166

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