... Abstract This paper focuses on an important problem of gas storage projects; the mixing of the cushion gas and the storage gas. Due to mixing, the reproduced gas may not meet customer specifications or valuable gas becomes unrecoverable. In this work we address the effect of shales...

... In the case of seasonal modulation storage, the cushion gas can represent up to half of the total amount of gas stored and up to 70 % of the investment necessary to create the storage. This has prompted the search for a substitute gas which is less costly. Different inert gases have proved...

... Abstract It has been proposed in the literature that certain economies might result from the use of an inert cushion gas, such as flue gas, during the storage of natural gas in aquifers. Where cushion gas is used, two types of displacement occur: - miscible displacement at the natural gas...

... or stratum of earth, gravel or porous stone. Upstream Oil & Gas reservoir pressure operation gas injection gas storage drainage boundary condition overpressure natural gas storage withdrawal cushion gas aquifer two-phase flow completion gas STORAGE RESERVOIR saturation society...