Oil recovery method

Details Oil recovery method Oil recovery method

E - Fixed Constructions

21

B

166/36

E21B 43/243 (2006.01)

Patent

CA 1252383

OIL RECOVERY METHOD Abstract The combustion front in an in situ combustion oil recovery operation is stabilized by cyclically varying the injection rate of the gaseous oxidant which is injected through the injection well. Periodic reduction in the injection rate of the oxidant halts the advance of the combustion front through the formation and permits the formation fluids to flow in a reverse direction back towards the front so that burned through fingers or streaks collapse and any overriding tendencies of the front are corrected. In this way, the vertical conformance of the front is increased to improve the sweep efficiency of the process. The process is most effective in externally pressured formations.

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