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• W2586250403 abstract "Abstract Coinjection of solvent with steam results in lower chamber-edge temperatures than those in steam-assisted gravity drainage (SAGD), which enable to decrease heat losses to the overlying formation rocks. However, use of highly volatile solvents, such as propane, can yield significantly slow bitumen production due to low chamber-edge temperatures. The objective of this research is to investigate the potential of water-soluble solvent as an additive to steam for reducing steam-oil ratio (SOR) while keeping SAGD-like rates of bitumen production. The chamber-edge temperature for a given overall composition and operating pressure is defined as the temperature at which the vapor phase completely condenses with decreasing temperature. Thermodynamic predictions show that the chamber-edge temperature so defined will increase substantially if the solvent can partition into the aqueous phase at chamber-edge conditions. This is confirmedin numerical reservoir simulation for coinjection of steam with dimethyl ether (DME), as a water-soluble solvent, for Athabasca bitumen. In simulation case studies, coinjection of steam with DME (DME-SAGD) is compared with SAGD and coinjection of steam with C4 (C4-SAGD), in terms of SOR, bitumen production, local displacement efficiency, and solvent recovery. The steam-injection pressure is 35 bars for all cases, and 2 mol% of solvent is coinjected in solvent-SAGD simulations until the steam chamber reaches the side boundary of a 2-D homogeneous reservoir model. DME is more volatile and less soluble in bitumen than C4 at their corresponding chamber-edge conditions. However, results show that DME-SAGD results in 35% lower SOR than SAGD while being able to increase bitumen-production rates of SAGD. Analysis of simulation results indicates that the solubility of DME in water not only makes the chamber-edge temperature higher than that of C4-SAGD, but also yields15% higher solvent-recovery factor than C4-SAGD. The main reason for the latter observation is that a much smaller fraction of the injected solvent is present in the vapor phase in DME-SAGD than in C4-SAGD. Also, DME dissolves in both water and bitumen, which results in the aqueous and oleic phases of nearly-equal density within the gravity-drainage zone near the edge of a steam chamber. This is the neutral regime of oil-water two-phase flow along the chamber edge between the two extreme cases: SAGD and C4-SAGD. Unlike in C4-SAGD, the reduced gravity segregation in DME-SAGD is expected to facilitate the mixing of condensed solvent with bitumen near the edge of a steam chamber." @default.
• W2586250403 created "2017-02-17" @default.
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• W2586250403 date "2017-02-15" @default.
• W2586250403 modified "2023-10-17" @default.
• W2586250403 title "Water-Soluble Solvent as an Additive to Steam for Improved SAGD" @default.
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• W2586250403 doi "https://doi.org/10.2118/184983-ms" @default.
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