Recovering hydrocarbons from tar sand or heavy oil reservoirs

Details Recovering hydrocarbons from tar sand or heavy oil reservoirs Recovering hydrocarbons from tar sand or heavy oil reservoirs

E - Fixed Constructions

21

B

E21B 43/24 (2006.01) E21B 43/30 (2006.01)

Patent

CA 2055549

Method of recovering hydrocarbons from an underground tar sand reservoir or heavy oil reservoir (5) comprising (a) drilling and completing a first pair (6) of wells and a second pair of wells (7), each pair comprising an injection well (9 and 14) terminating in the reservoir (5) and a production well (13 and 18) terminating in the reservoir (5) below the injection well (9 and 14); (b) circulating steam through the injection wells (9 and 14) and performing alternate steam injection and hydrocarbon production through the production wells (13 and 18); and (c) injecting steam through the injection wells (9 and 14) while producing hydrocarbons through the production wells (13 and 18), wherein the injection pressure of the injection well (9) of the first pair (6) of wells is greater than the injection pressure of the injection well (14) of the second pair (7) of wells.

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