Optimized lower pressure limit for condensate underground gas storage using a dynamic pseudo-component model

Temperature dependence of hydrogen diffusion in reservoir rocks: implications for hydrogen geologic storage

“…71 Similar to natural gas storage, cushion gas is utilized and injected into a storage formation in precedent to H 2 to maintain sufficient reservoir pressure during the withdrawal period. 2,68,72 As a result, hydrogen injection imposes a highly saturated and homogenous hydrogen plume near the wellbore. Advection in association with pressure gradient and diffusion due to concentration gradient are two primary flow mechanisms leading to the subsurface transport of hydrogen.…”