In situ thermal process for recovering oil from oil sands

Details In situ thermal process for recovering oil from oil sands In situ thermal process for recovering oil from oil sands

E - Fixed Constructions

21

B

E21B 43/24 (2006.01) C10G 1/04 (2006.01)

Patent

CA 2631977

A method of recovering oil from an oil sands reservoir comprises first applying cyclic steam stimulation (CSS) to a series of generally horizontally extending wells in the reservoir; then applying steam assisted gravity drainage (SAGD) to at least one vertically-spaced well pair in which one well in each well pair is part of the series of wells to which CSS was applied, while producing oil from at least one single well in the series of wells. In this case, each single well is adjacent to and offset from at least one of the well pairs. The method can then further comprise applying a SAGD blowdown to an injector well of each well pair and producing oil from a producer well of each well pair and from the single well to economic limit.

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