Effect of Non-equilibrium Gas Injection on the Performance of (Immiscible and Miscible) Gas–Oil Gravity Drainage in Naturally Fractured Reservoirs

• DOI: 10.1021/ef401372d
• Publication Date: 2013-09-10T15:25:12Z
• Authors: A. Ameri; R. Farajzadeh; V. S. Suicmez; M. Verlaan; J. Bruining
• Keywords: Miscibility; Steam-assisted gravity drainage

In naturally fractured reservoirs, improving the matrix–fracture interactions is critical to success of applied improved oil recovery method. Therefore, a study mechanisms that control mass exchanges between fracture and matrix can help optimize recovery. This paper concerns an experimental simulation investigate performance gas–oil gravity drainage process in reservoirs. this study, five gas injection experiments were conducted at different miscibility (i.e., immiscible fully miscible) conditions using CO2, N2, synthetic flue composed 20% (v/v) CO2 80% N2. The impact switching from nitrogen or gas) non-equilibrium miscible investigated. effect on block–block interaction also examined stacked core with impermeable barrier. results reveal higher solubility phase zone decreased viscosity, which leads mediated show ultimate increases considerably once achieved. A numerical model implemented perform compositional simulations multiphase, multicomponent injections conditions. Agreement developed indicates drainage, capillary holdup, mixing are main controlling mechanisms.