A method for operating a production well during an oxygen driven in-situ combustion oil recovery process comprising continuously injecting an inert gas such as nitrogen or carbon dioxide into the bottom of the production well at a predetermined low injection rate, preferably 0.1 to 2 MSCF/day, and continuously...http://www.google.de/patents/US4598772?utm_source=gb-gplus-sharePatent US4598772 - Method for operating a production well in an oxygen driven in-situ combustion oil recovery process
