Estimation of Carbon Dioxide Storage Capacity for Depleted Gas Reservoirs

The purpose of this study was to develop analytical equations to estimate CO2 storage capacity for depleted wet/dry gas reservoirs. The effects of CO2 injection on the changings of reservoir pressure and the mole fractions of CO2 and natural gas were studied from a verified pressure-volume-temperature process. There was a linear relationship between the corrected pressure term (p(r)/z(mix)) and the cumulative production term (G(pt)-G(injCO2)). The amount of CO2 storage can be analysed directly from the pilzmr, plot. The total volume of CO2 storage is larger than that of natural gas production from a depleted gas reservoir. (C) 2015 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecomons.org/licenses/by-nc-nd/4.0/).