E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 43/24 (2006.01) E21B 43/16 (2006.01)
Patent
CA 2325777
Abstract A process for recovery of hydrocarbons from an underground reservoir of said hydrocarbons the underground reservoir being penetrated by an injection well and a production well spaced from the injection well, the process comprising: (a) injecting steam into said reservoir thereby heating said reservoir to mobilize and recover at least a fraction of said hydrocarbons and to form a chamber in said reservoir; and then, (b) continuing to inject steam into said reservoir and mobilize and recover hydrocarbons therefrom until at least one of (i) an upper surface of said chamber has progressed vertically to a position that is approximately 25 to 75%, preferably 40 to 60%, or about 50% the distance from the injection well to the top of the reservoir, and (ii) the recovery rate of said hydrocarbons is approximately 25 to 75%, preferably 40 to 60%, or about 50% of the peak predicted recovery rate using steam-assisted gravity drainage; and (c) injecting a solvent of at least a fraction of said hydrocarbons, said solvent being capable of existing in vapor form in said chamber and being just below said solvent's saturation pressure in said chamber thereby mobilizing and recovering a subfraction of said fraction of said hydrocarbons.
Gutek Harold
Harschnitz Brian
Myers Ron D.
Okazawa Tadahiro
Borden Ladner Gervais Llp
Imperial Oil Resources Limited
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