Maximizing CO2-EOR Potential for Carbonate Reservoir, Horus Field, Western Desert, Egypt

Horus Field whose main reservoir is Abu Roash "G" Dolomite, has been facing a decline in the production rates; however, it has managed to maintain a stable oil production plateau of 1050 barrels per day, with a significant water cut of 65%. This paper aims to investigate the efficiency of CO 2 EOR for the Horus field to identify the optimal approaches for maximizing oil recovery. An experimental study was employed using real core plug samples from the field. The setup was configured to mimic reservoir conditions at 70°C and 1200 psi, followed by injecting formation water, crude oil, and CO 2 to study primary drainage, secondary imbibition, and enhanced oil recovery (EOR). The study yielded results of achieving 0.59 PV oil saturation after primary drainage and further oil recovery through subsequent water flooding and CO 2 injection. The findings presented a promising opportunity into the behavior of the CO 2 in the carbonate reservoirs and its impact on oil recovery where the primary recovery methods produced 11.5 million barrels, representing a recovery factor of 19.6% of the OOIP