Numerical modelling of gas injection experiment using damage model

If the gas production rate exceeds the gas diffusion rate in the pores of the engineering barrier, the pressure of the gas continuously increases and sudden gas flow occurs when the specific pressure is reached. Since the concept of the porous medium considering the existing two-phase flow is inadequate to simulate this phenomenon, it is necessary to develop a new numerical model for gas migration in the low permeability layer. Therefore, in this study, we developed a gas migration model using mechanical damage model and compared the results of laboratory gas injection experiment and numerical analysis. For modelling about gas migration, we developed a gas migration model using mechanical damage model and compared the results of laboratory gas injection experiment and numerical analysis. In general, Pore pressure results are well matched. The trend of peak and post-peak pressure is well matched, however, timing of increase to the peak is wrongly predicted.