Numerical Simulation Research on Underground Gas Storage Considering Fracture Deformation

The influence of rock deformation on reservoir porosity and permeability is taken into consideration in this paper. Based on Warren-Root dual-porosity model, the mathematical model of gas storage that accounts for fracture deformation's influence is developed. A real case is calculated with the model. The result analysis shows that with the increase of the total operation time, gas storage pressure and gas injection well bottom hole pressure increases, porosity and permeability decrease. The gas storage pressure without deformation effect fluctuates in a certain range, and the bottom hole pressure of gas injection well without deformation effect basically remains the same. So the fracture deformation effect cannot be neglected in the study of depleted fractured reservoir underground gas storage. It is suggested that deformation effect should be take into account in field application and theoretical investigation of underground natural gas storage.