CO2 sequestration in gas-condensate reservoirs

Abstract

In this thesis, it is being analyzed effects of carbon dioxide (CO2) injected into a retrograde gas reservoir to enhance liquid production from such reservoirs while simultaneously sequestering amounts of CO2. Mixing between carbon dioxide (injection fluid) and gas condensate (resident gas) is limited due to high density and viscosity of carbon dioxide relative to gas condensate. Simulations for Carbon Dioxide injection were done in idealized reservoir using 3 different Displacement Models and different correlations to model CO2 properties. This analysis includes a study of carbon dioxide physical properties into the system of CO2-Gas Condensate. In order to diminish discrepancies for modeling of carbon dioxide physical properties mainly for its supercritical state, it has been plotted data and compared with actual data for Carbon Dioxide Properties which shows very good approximations for the different correlations chosen when developing the in-house simulator. Additionally, carbon dioxide injection may offer other benefits such as pressure support, important feature for gas condensate reservoirs.