In Situ Thermal Process For Recovering Oil From Oil Sands
AssigneeHusky Oil Operations Limited
InventorGokhan Coskuner
Life of this patent
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Abstract
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.
Claims11
A method of recovering oil from an oil sands reservoir, comprising:
- (a) applying cyclic steam stimulation (CSS) to a series of generally horizontally extending wells in the reservoir;
- then
- (b) applying steam assisted gravity drainage (SAGD) to a vertically-spaced well pair in which one well in the well pair is part of the series of wells to which CSS was applied, and producing oil from a single well in the series of wells to which CSS was applied, the single well being laterally spaced from the well pair without any other well therebetween.
Dependencies are inferred from the claim text.