Flue gas injection into depleted tight hydrocarbon reservoirs in the context of global warming mitigation: Computed evolution of some reservoir parameters

CO2 storage in depleted tight hydrocarbon reservoir seems to be a promising solution mitigate greenhouse gas emissions. However, flue contains not only but also minor gaseous impurities due production or capture processes. In the case of oxy-combustion, main impurity can O2 concentration up 7%. injection into lead oxidation residual hydrocarbons and therefore, it is necessary assess thermal consequences on reservoir. COMSOL Multiphysics® has been used model an axisymmetric fractured porous with its cap base rocks containing n-octane as compound oil. A global kinetic for derived from previous detailed free-radical model, implemented model. Simulated injections N2/O2 mixture (representing simplified gas) have performed compute temperature, pressure profiles. The results show that exothermicity may strong influence temperature profile, especially when heat capacity rock rather low. these conditions, remaining consumed some months. conductivity negligible. Therefore, appears safer select reservoirs whose compositions, particular rocks, high promote dissipation. It criterion consider selecting site hydrocarbons, captured after oxy-combustion.