Evaluation of Gas-Based EOR Methods in Gas-Invaded Zones of Fractured Carbonate Reservoir

More than half of all recoverable oil reserves are found in carbonate rocks. Most these fields highly fractured and develop different zonations during primary secondary recovery stages; therefore, they require a developmental approach conventional reservoirs. Experimental results for water-alternating gas injection [WAG] foam-assisted [FAWAG] under tertiary conditions were used to investigate enhanced [EOR] methods gas-invaded The relative permeability curves the cores fitting foam parameters derived from experiments through history matching. These findings then quarter five-spot, cross-sectional, sector model reservoir where double five-spot setup was implemented. fracture matrix properties’ impact on illustrated cross-sectional model. mobility reduction effect FAWAG more noticeable that WAG. apparent viscosity increased due presence, which caused diversion fractures into blocks. This greatly sweep efficiency led higher recovery. front much sharper, gravity overrides by less concern. properties network also had significant Oil be most sensitive permeability. At same time, substantially, improving rate early stages, differed slightly at ultimate However, lower facilitated entry similar core pilot. WAG recovered uppermost layers, whereas portions lowest layer not effectively recovered. In contrast, effective reservoir. beneficial aid reservoirs, increasing factor with respect