Geomechanical analysis of formation deformation and permeability enhancement due to low-temperature CO2 injection in subsurface oil reservoirs

Abstract Several benefits of CO 2 injection are reported in the literature such as its ability to mitigate greenhouse gas emissions and increase oil recovery at a low cost. However, correlated reservoir-engineering problems with low-temperature including formation damage leakage risk still uncertain has not been comprehensively investigated. This research examines effect on lowering breakdown pressure, associated from geomechanical prospective. study presents coupling equilibrium stress equation, system energy balance continuity saturation equation develop thermoporoelastic model for reservoir rock. We determined cooling-induced due decrease temperature thermal stresses, contraction tensile examine effects properties, joint fracture stability. observed that would create region thus could fail tension. process might permeability but it stability reservoir, basement caprock. analyzed several factors affecting deformation rate both miscible immiscible flooding, porosity, depth, temperature, pressure. also compared our results findings experimental data, finding excellent match similar consequences. Furthermore, sequence injection, initial pressure was initially 2560 psi reduced 1928 case 1270 selected study. propose shallow reservoirs should be avoided capture storage because issues.