Oilfield enhanced in situ combustion process

Details Oilfield enhanced in situ combustion process Oilfield enhanced in situ combustion process

E - Fixed Constructions

21

B

E21B 43/243 (2006.01)

Patent

CA 2569676

A method for recovery of oil in toe-to-heal in-situ combustion processes from underground petroleum formations, having at least one injection well for injecting oxidizing gas into the underground formation and one production well having a substantially horizontal leg and a substantially vertical production well connected thereto wherein the substatially horizontal leg extends toward the injection well, the horizontal leg having a heel portion in the vicinity of its connection to the vertical producution well and a toe portion at the opposite end of the horizontal leg proximate the injection well. The improvement comprises either i) providing tubing inside the production well and injecting steam or water into the horizontal leg portion via said tubing so that steam/water is conveyed to the toe portion, ii) injecting steam/water into the injection well in addition to oxidizing gas, or iii) providing and carrying out both of steps i) and ii).

L'invention concerne un procédé de récupération de pétrole lors de processus de combustion in situ pointe-talon à partir de formations pétrolifères souterraines, qui dispose d'au moins un puits d'injection destiné à l'injection de gaz oxydants dans la formation souterraine et d'un puits de production doté d'une pile sensiblement horizontale ainsi que d'un puits de production sensiblement vertical qui y est raccordé. La pile sensiblement horizontale, qui s'étend en direction du puits d'injection, est dotée d'une partie talon à proximité de son raccordement au puits de production vertical et d'une partie pointe à l'extrémité opposée de la pile horizontale à proximité du puits d'injection. L'amélioration consiste i) à fournir un tubage à l'intérieur du puits de production et à injecter de la vapeur ou de l'eau dans la partie pile horizontale par le biais dudit tubage de façon à transmettre la vapeur/l'eau à la partie pointe, ii) à injecter la vapeur/l'eau dans le puits d'injection en sus des gaz oxydants, ou iii) à prévoir les deux étapes i) et ii) et à les exécuter.

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