E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/31
E21B 43/22 (2006.01) C09K 8/58 (2006.01) E21B 43/16 (2006.01) E21B 43/24 (2006.01)
Patent
CA 1051342
METHOD FOR RECOVERING VISCOUS PETROLEUM (D#74,601-F) ABSTRACT OF THE DISCLOSURE Recovery of viscous petroleum from thick forma- tions is especially difficult because thermal fluids or solvents needed to mobilize the viscous petroleum tend to channel through high permeability streaks in the formation, thereby bypassing large portions of the petroleum saturated formation. By forming or ensuring that there are naturally occurring high permeability strata in the upper portion and in the lower portion of the petroleum formation, and establishing separate communication means between the sur- face of the earth and the upper and lower high permeability strata, effective downward displacement may be achieved. A heated fluid such as steam is injected into one well in fluid communication with the lower high permeability strata to pass horizontally through the high permeability strata to another well which is also in fluid communication with the lower high permeability strata, sufficient to heat the lower high permeability zone to a temperature substantially above the ambient temperature of the forma- tion. A solvent having a boiling point intermediate between the ambient temperature of the formation and the temperature to which the communication path is heated is injected into the heated communication path. The solvent vaporizes and moves up into the formation immediately thereabove to dissolve into the viscous petroleum. A gaseous substance is then injected into the upper high permeability strata to increase the pressure therein sufficiently to displace the mixture of viscous petroleum and solvent downward into the lower high permeability strata, wherein it is displaced horizontally to a remotely located well for recovery to the surface of the earth. I
260035
Brown Alfred
Park Jack H.
Wu Ching H.
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