Influence of CH4 adsorption diffusion and CH4-water two-phase flow on sealing efficiency of caprock in underground energy storage

Underground natural gas energy storage (UNGNS) plays an important role in ensuring the reliability of the pipeline equipment and the stability of the energy market. In this paper, a mathematical model of CH4-water two-phase flow is introduced and the influence of matrix and fracture and the properties of dual-porosity media of caprock are considered in the model. CH4 and water flow in the fractures of the caprock and CH4 diffuses to the matrix...