Semi-Analytical Solution to Assess CO2 Leakage in the Subsurface through Abandoned Wells

Geological carbon storage is an effective method capable of reducing dioxide (CO2) emissions at significant scales. Subsurface reservoirs with sealing caprocks can provide long-term containment for the injected fluid. Nevertheless, CO2 leakage a major concern. The presence abandoned wells penetrating reservoir caprock may cause flow-paths to overburden. Assessment time-varying leaky need. In this paper, we propose new semi-analytical approach based on pressure-transient analysis model behavior and corresponding pressure distribution within site Current methods assume instantaneous occurring injection, which not realistic. work, employ superposition in time space solve diffusivity equation 2D radial flow approximate transient reservoirs. Fluid rock compressibilities are taken into consideration, allow calculating breakthrough rate overburden accurately. We use numerical simulations verify proposed time-dependent solution. results show good agreement both rates. Sensitivity then conducted assess different scenarios developed solution provides simple practical potential outside site. This alternative when detailed feasible. Furthermore, also be used codes, often exhibit artifacts.