An Investigation into the Enhancement of Condensate Recovery from Retrograde Gas Condensate Reservoirs

The loss in condensaterecovery from gas condensatereservoirs due to condensatedropout when the flowing bottom hole pressure drops below the dew pointpressure of the in-situ reservoir fluid is significant. Pressure maintenance and gas cycling are the standard practices used to alleviate this problem and enhance the condensateand gas recoveries. In this study, swelling and constant volume depletiontests are conducted on the original fluid sample from a gas condensatereservoir. Various scenarios regarding gas injection recycling are examined to determine the most appropriate gas for injection which enhances gas and condensaterecovery. In this study, injection of three gases (CO2, N2 and separator gas) with different injection volumes on the current field fluid were tested using simulation. Based on the results of this study, CO2 was the most efficient gas followed by separator gas and N2 respectively to inject into the gas condensatereservoirs for decreasing the condensatedropout and enhancing its recovery. This result is significant as CO2 injection in gas condensatereservoirs could be used to sequestrate the produced CO2 from power plants and other sources while enhancing the production from gas condensatereservoirs.