This example concerns injection of CO2 into a natural gas storage reservoir aiming at both the sequestration of CO2 and the cushion gas substitution. The presented study involves a rather straightforward injection strategy and well pattern. Partly, we test whether the strategy allows for a reasonably low mixing between CO2 and natural gas. We use a synthetic reservoir model that includes a structural trap formed by an anticline. The reservoir is buried at the depth of 1000 m. It is a high-permeability layer of uniform thickness of 25 m. There are two groups of vertical wells placed in the circular patterns. The group located in the centre region of the anticline is used for temporary storage of natural gas. The other group of wells located far from the centre is used only for CO2 injection. The CO2-wells are intentionally placed at a distance from the centre to substitute the cushion gas. Here, the high compressibility of supercritical CO2 can assist the natural gas withdrawal at decreasing average reservoir pressure. We simulate 3 seasons of the natural gas injection and withdrawal.
|GAS-STORAGE.RUN||2021.B||Input file for the example simulation of CO2 injection into a natural gas storage reservoir.|
|GAS-STORAGE-QUARTER.RUN||2021.B||Input file for the example simulation of CO2 injection into a natural gas storage reservoir. This input file is for the same study in a quarter of the original domain.|
|GAS-STORAGE.GRDECL||-||Formatted grid file.|