نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشگاه صنعتی امیرکبیر، دانشکده مهندسی نفت
2 دانشگاه صنعتی امیرکبیر
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Gas injection through miscible flooding has always been considered the most efficient method for enhancing oil recovery. However, maintaining and sustaining injection pressure under miscible or near-miscible conditions is operationally challenging and costly. In fractured reservoirs, due to the presence of smooth and channel-like pathways, it is possible to achieve oil recovery equivalent to near-miscible conditions at lower pressures. Nevertheless, simulating fractured reservoirs is inherently difficult due to their complexities and heterogeneities, with mass transfer effects playing a critical role.
Therefore, this study investigates the impact of mass transfer on the oil-CO2 flow behavior at the pore scale in a gas injection process under immiscible conditions in a heterogeneous fractured porous medium. Numerical simulations at the pore scale are conducted in a pressure region far from the miscibility zone for two cases using the COMSOL computational fluid dynamics software. The first case utilizes the Phase Field module, which employs Navier-Stokes equations to track fluid movement in the porous medium. The second case combines two independent modules; the Phase Field method and the Transport of Diluted Species method, with the latter added to examine the effect of CO2 gas mass transfer to the oil phase, utilizing Fick's classical laws.
The simulation results indicate that considering the mass transfer effect significantly increases the sweep efficiency of residual oil in small throats, especially in those adjacent to fractures. Ultimately, this increases the final recovery factor from 81% without considering mass transfer to 89% with mass transfer, closely resembling near-miscible conditions.
کلیدواژهها [English]
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