| Abstrakt: |
The effect of introducing polymer in water-alternating-gas (WAG) as an improved oil recovery method in a highly synthetic reservoir model was conducted using reservoir simulator, CMG-STARS. The investigation revealed that polymer-alternating-gas (PAG) had the highest oil recovery, reaching 74.87%. It was followed by WAG, polymer, water, and CO2 floodings, which attained oil recoveries of 69.41 %, 68.45 %, 57.43 %, and 54.98 % respectively. As the simulation ended, the PAG flooding had made the most significant incremental improvement in oil recovery, marking a substantial increase of 17.44% compared to the base case of waterflooding. In terms of residual oil saturation (ROS), the PAG flooding significantly enhanced sweep efficiency, both in areal and vertical aspects, by augmenting water viscosity to address early gas breakthrough and gravity segregation issues. The range of improvement in efficiency spanned from 0.012 to 0.366. Furthermore, PAG flooding stood out with the lowest water cut when contrasted with other water-based methods, recorded at 47%. This reduction was attributable to the constraint imposed on water movement. Comparisons with a previous study showed the superior oil recovery achieved by all methods, accompanied by lower gas-to-oil ratio (GOR) values. [ABSTRACT FROM AUTHOR] |
