Case Study of CO2-IGR and Storage in a Nearly Depleted Gas-condensate Reservoir in Taiwan

Suitability of depleted gas reservoirs for geological CO2 storage: A simulation study

“…There have been many studies carried out to show the potential of injecting CO 2 into dry gas and condensate gas reservoirs using numerical modeling techniques. According to these studies, the success of a CO 2 storage practice is linked to the injection strategy, reservoir characteristics, and operational parameters.…”

“…They concluded that CO 2 injection can provide a 100% recovery for condensate gas which makes these reservoirs a better place for storage compared to aquifers. Shen et al . investigated CO 2 storage in nearly depleted gas reservoirs.…”

“…4,5 For instance, the Gorgon Carbon Dioxide Injection project in Australia has been initiated and is in its construction phase for the deployment of CO 2 in a gas field. 6 There have been many studies carried out to show the potential of injecting CO 2 into dry gas [7][8][9][10][11][12][13][14][15] and condensate gas reservoirs 4,[16][17][18][19] using numerical modeling techniques. According to these studies, the success of a CO 2 storage practice is linked to the injection strategy, reservoir characteristics, and operational parameters.…”

“…They concluded that CO 2 injection can provide a 100% recovery for condensate gas which makes these reservoirs a better place for storage compared to aquifers. Shen et al 18 investigated CO 2 storage in nearly depleted gas reservoirs. They concluded that CO 2 sinks into the bottom of the gas cap and stores permanently when gas recovery by CO 2 displacement and condensate revaporization processes take place.…”

“…20 For instance, some gas reservoirs may cause loss of injectivity, overpressurization or less CO 2 immobilization as the mixture of CO 2 with the residual gas may change the properties of the CO 2 and gas mixture. 15,18,[21][22][23] In the meantime, CO 2 mixing with resident gas depends on the reservoir geometry, anisotropy, heterogeneity, injection rate, time of injection, rock or fluid properties, and diffusion, which can only be studied through numerical simulation. In this paper, a 3D numerical model was built based on the modified Peng-Robinson equation to explore the feasibility of gas reservoirs for long-term CO 2 storage.…”