Simulation and Sensitivity Analysis of Flare Gas Recovery for Application in Hydrocarbon Reservoirs as Injection Gas

Flare gas recovery is one of the essential processes in reducing the greenhouse gas emissions caused in the oil and gas industry. On the other hand, due to the reduction of pressure and production rate of hydrocarbon reservoirs especially in Iran, it is necessary to provide solutions for reservoirs pressure maintenance. Therefore, in this paper the potential application of the separated carbon dioxide from the flare gas in Parsian refinery was investigated for injection into a gas condensate reservoir. For this purpose, the flare gas recovery process was simulated using Aspen HYSYS software and operational enhancements were applied. Next, the injection of the separated carbon dioxide into a gas condensate reservoir was simulated in Petrel software, and the best scenario was determined. The obtained results indicated that maximum CO2 recovery is achieved using Diisopropanolamine as solvent with the flow rate 1930 USGPM. The reservoir simulation results revealed that CO2 injection prevents severe pressure drop and causes the reservoir pressure to decline with a lower slope. Thus, the reservoir production rate increases and becomes more stable. The most stable production rate was attained for injection rate of 305 million cubic meters per day.