Abstract
This article presented a comparative evaluation between the conventional SAGD and the Fast-SAGD application in three typical formations of Alberta's Oil Sand that included McMurray, Clearwater, and Bluesky formations. Three reservoir models with a series of numerical simulations under various operation conditions were developed to achieve the most unprejudiced comparison between two bitumen recovery processes. The simulation results proved that significantly recoverable bitumen was produced from offset wells in the Fast-SAGD system and leads to a higher recovery factor. There is only a slight increase in cumulative oil recovery when two processes were performed in the same pattern with a similar number of production wells. The results also indicated that the difference of 10 kPa between steam injection pressure and reservoir pressure in the literature is not enough for both SAGD and Fast-SAGD operations. Finally, a precious guideline was recommended in order to achieve the most success on SAGD and Fast-SAGD application at those formations.
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