scholarly journals Formation dry-out from CO2 injection into saline aquifers: 2. Analytical model for salt precipitation

2009 ◽  
Vol 45 (3) ◽  
Author(s):  
Karsten Pruess
Keyword(s):  
Analytical Model ◽  
Saline Aquifers ◽  
Co2 Injection ◽  
Salt Precipitation ◽  
Dry Out

scholarly journals Analytical Solution to Evaluate Salt Precipitation during CO2 Injection in Saline Aquifers

2009 ◽  
Vol 1 (1) ◽  
pp. 1775-1782 ◽  
Author(s):  
Mehdi Zeidouni ◽  
Mehran Pooladi-Darvish ◽  
David Keith
Keyword(s):  
Analytical Solution ◽  
Saline Aquifers ◽  
Co2 Injection ◽  
Salt Precipitation

scholarly journals Experimental Investigation of the Mechanisms of Salt Precipitation during CO2 Injection in Sandstone

2019 ◽  
Vol 5 (1) ◽  
pp. 4 ◽  
Author(s):  
Yen Adams Sokama-Neuyam ◽  
Jann Rune Ursin ◽  
Patrick Boakye
Keyword(s):  
Co2 Storage ◽  
Simulation Models ◽  
Co2 Injection ◽  
Salt Precipitation ◽  
Physical Mechanisms ◽  
Low Salinity ◽  
Core Flood ◽  
Dry Out ◽  
The Impact ◽  
Brine Salinity

Deep saline reservoirs have the highest volumetric CO2 storage potential, but drying and salt precipitation during CO2 injection could severely impair CO2 injectivity. The physical mechanisms and impact of salt precipitation, especially in the injection area, is still not fully understood. Core-flood experiments were conducted to investigate the mechanisms of external and internal salt precipitation in sandstone rocks. CO2 Low Salinity Alternating Gas (CO2-LSWAG) injection as a potential mitigation technique to reduce injectivity impairment induced by salt precipitation was also studied. We found that poor sweep and high brine salinity could increase salt deposition on the surface of the injection area. The results also indicate that the amount of salt precipitated in the dry-out zone does not change significantly during the drying process, as large portion of the precipitated salt accumulate in the injection vicinity. However, the distribution of salt in the dry-out zone was found to change markedly when more CO2 was injected after salt precipitation. This suggests that CO2 injectivity impairment induced by salt precipitation is probably dynamic rather than a static process. It was also found that CO2-LSWAG could improve CO2 injectivity after salt precipitation. However, below a critical diluent brine salinity, CO2-LSWAG did not improve injectivity. These findings provide vital understanding of core-scale physical mechanisms of the impact of salt precipitation on CO2 injectivity in saline reservoirs. The insight gained could be implemented in simulation models to improve the quantification of injectivity losses during CO2 injection into saline sandstone reservoirs.

scholarly journals The effect of CO2 injection on caprock permeability in deep saline aquifers

2020 ◽  
Vol 205 ◽  
pp. 02010
Author(s):  
Dinesha Wanigarathna Jayasekara ◽  
Ranjith Pathegama Gamage
Keyword(s):  
High Salinity ◽  
Saline Aquifers ◽  
Co2 Injection ◽  
Core Flooding ◽  
Geochemical Reactions ◽  
Saturated Sample ◽  
Flow Through ◽  
Deep Saline Aquifers ◽  
Water Saturated ◽  
Dry Out

During CO2 injection into deep saline aquifers, the overlying caprock may be subjected to geochemical reactions which can alter the leakage pathways for injected CO2. Thus, it is crucial to identify the supercritical CO2 (scCO2) flow behaviour via fractures in caprock and its permeability to estimate the permanence of injected CO2. The objective of this study is to find the effect of scCO2 flow on fractured caprock permeability. A fractured siltstone sample was saturated in deionized water and conducted scCO2 permeability tests using a high-precision advanced core flooding apparatus under different injection pressures and confinements. Next, the siltstone sample was saturated in 10% w/w NaCl brine and conduced scCO2 permeability tests as described earlier. The results show that the brine-saturated sample has low permeability compared to water-saturated siltstone sample. The reason would be the deposition of evaporites during scCO2 flow through the fractured sample. This is known as CO2 dry-out phenomenon or absorbing moisture into the scCO2, making the remaining brine saturated with salts. Thus, the CO2 back-migration through the caprock discontinuities becomes minimized due to CO2 dry-out phenomenon, which is an advantage for the caprock integrity in deep saline aquifers. In addition, aquifers with high salinity contents show significant dry-out phenomenon because pore fluid easily becomes supersaturated with salts due to evaporation of moisture into the scCO2.

New Insights Into CO2 Injection and Storage in Saline Aquifers

2012 ◽  
Author(s):  
Mehran Sohrabi ◽  
Masoud Riazi ◽  
Christian Bernstone ◽  
Mahmoud Jamiolahmady ◽  
Nils-Peter Christensen
Keyword(s):  
Saline Aquifers ◽  
Co2 Injection ◽  
And Storage
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