Energy efficient method and apparatus for stimulating heavy...

E - Fixed Constructions – 21 – B

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E21B 43/22 (2006.01) C09K 8/592 (2006.01) E21B 43/24 (2006.01)

Patent

CA 2374115

A method for extracting oil from a formation is disclosed. The method includes selecting a condensing solvent having a high vapour pressure at low temperatures and injecting the solvent into the formation. Then the solvent is condensed in the formation to deliver a latent heat of condensation to said oil and to mobilize said oil. The oil is then produced, and solvent is recovered from the produced oil. The recovered solvent is then conditioned for reinjection by being heated by means of a heat pump and compressor. Then it is reinjected into the formation. In a preferred aspect the thermal coefficient of production is greater than 1. An oil recovery system for carrying out the process is also disclosed.

Méthode d'extraction de l'huile lourde d'une formation. La méthode comprend les étapes suivantes : la sélection d'un solvant de condensation ayant une pression de vapeur élevée à basse température et l'injection du solvant dans la formation. Le solvant est ensuite condensé dans la formation pour fournir une chaleur latente de condensation à l'huile et la libérer. L'huile est ensuite produite, et le solvant est récupéré de cette huile produite. Le solvant récupéré est ensuite traité pour sa réinjection en le chauffant au moyen d'une thermopompe et d'un compresseur. Le solvant récupéré est ensuite réinjecté dans la formation. Selon un aspect préféré, le coefficient thermique de production est supérieur à 1. Un système de récupération d'huile permettant de mener le processus à bien est également décrit.

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