Physicochemical effects of discrete CO 2 -SO 2 mixtures on injection and storage in a sandstone aquifer

A modelling study to evaluate the effect of impure CO2 on reservoir performance in a sandstone saline aquifer

“…The presence of impurities can alter the molar volumes and shift the boundaries in the CO 2 phase diagram to higher pressures, which implies higher operating pressures and cost may be required for CO 2 storage [ 3 ]. Therefore, the overall storage capacity can be adversely affected [ 7 ]. On the other hand, the possible short term effects of impurities on the reservoir performance may indicate the necessity of a change in injection strategy [ 7 ].…”

“…Therefore, the overall storage capacity can be adversely affected [ 7 ]. On the other hand, the possible short term effects of impurities on the reservoir performance may indicate the necessity of a change in injection strategy [ 7 ]. While it is crucial to quantify the long-term effects of impurities on storage sites in real life applications, it is equally important to note that laboratory experimental approaches are complex, costly and inadequately slow.…”

“…Waldmann et al. [ 7 ] studied the physicochemical effects of discrete CO 2 –SO 2 mixtures on injection and storage in order to assess the impact on overall storage capacity in the Ketzin injection site, Germany. In their study, they considered geological conditions in the Ketzin site, and they assessed the impact of SO 2 on the physicochemical behaviour of the CO 2 phase by geochemical modelling of fluid-rock interactions.…”

Micro-CT Characterization of Wellbore Cement Degradation in SO42-–Bearing Brine under Geological CO2 Storage Environment

“…In addition to the injection of pure CO 2 for storage, some researchers also simulated storage environments to inject impurities such as H 2 S and SO 2 into the reservoir together with CO 2 [3,[23][24][25][26][27][28][29]. In the process of fossil fuel processing and sulfur-containing natural gas purification, impurity gases such as H 2 S and SO 2 will be released with the release of CO 2 , and the impurity gas needs to be removed before the CO 2 is injected into the underground reservoir.…”

“…In addition, in the case of CO 2 and H 2 S coinjection, the antierosion capacity of wellbore cement and pure cement mixed with different amounts of pozzolan is different [3,25,31]; compared with pure wellbore cement, cement mixed with 35 vol% pozzolan has similar erosion resistance to CO 2 and H 2 S, while pozzolan-amended cement with 35 vol% of pozzolan has better anticorrosion performance than cement with 65 vol% of pozzolan. There is no reported work on the reaction between wellbore cement and SO 2 -CO 2 mixed gas in the reservoir, while the studies of reservoir rock reaction with the mixed gas of SO 2 and CO 2 have been done [26,27,29,32]. After being injected to the reservoir, SO 2 will form sulfuric acid with water and O 2 and then react with reservoir rock.…”