Thermal oil recovery with solvent recirculation

Details Thermal oil recovery with solvent recirculation Thermal oil recovery with solvent recirculation

E - Fixed Constructions

21

B

166/39

E21B 43/24 (2006.01) E21B 43/16 (2006.01) E21B 43/40 (2006.01)

Patent

CA 1192487

-21- ABSTRACT A process for the production of heavy oil from a subterranean oil reservoir by the injection of a hot aqueous fluid into the reservoir and the injection of a diluent solvent down the production well to produced a blend of solvent and oil having a decreased viscosity. The reservoir oil has a density greater than the density of water. The diluent solvent has a density such that the density of the resulting blend recovered from the production well also has a density greater than the density of the water. The water produced from the production well is separated from the blend and the blend then fractioned to recover a solvent fraction of the requisite density. This solvent fraction is then returned to the production well to produced additional blend within the well in a continua- tion of the process.

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