Numerical Modeling of Mineral Dissolution of Carbonate Rocks During Geological Co2 Sequestration Processes

2017 ◽  
Author(s):  
Tao Yuan ◽  
Yang Ning ◽  
Guan Qin
Keyword(s):  
Numerical Modeling ◽  
Carbonate Rocks ◽  
Co2 Sequestration ◽  
Mineral Dissolution ◽  
Geological Co2 Sequestration

Modeling the Effect of Reduced Liquid-Wetting on Spontaneous Imbibition for Condensate Blocking Applications

2012 ◽  
Author(s):  
Nour El Cheikh Ali ◽  
Mahmoud Abouseida ◽  
Mashhad Fahes
Keyword(s):  
Numerical Modeling ◽  
Carbonate Rocks ◽  
Capillary Forces ◽  
Experimental Results ◽  
Spontaneous Imbibition ◽  
Altered Rock ◽  
Liquid Saturation ◽  
Expected Result ◽  
Condensate Blocking

In this paper, we present our interpretation for some of the unexpected experimental results that we obtained during 3D spontaneous imbibition experiments. We treated carbonate rocks with flourochemical polymers where we altered the wettability towards reduced liquid-wetting. The expected result is a reduced imbibition rate as a result of reduced capillary forces. Although the early imbibition rate decreased, we observed an increase in rate at late imbibition time resulting in a higher liquid saturation in the altered rock. We used numerical modeling to interpret the result and show that this observation actually represents the target wettability state we should be seeking in some applications.

scholarly journals Experimental Investigation and Numerical Simulation of CO2–Brine–Rock Interactions during CO2 Sequestration in a Deep Saline Aquifer

2019 ◽  
Vol 11 (2) ◽  
pp. 317 ◽  
Author(s):  
Bo Liu ◽  
Fangyuan Zhao ◽  
Jinpeng Xu ◽  
Yueming Qi
Keyword(s):  
Co2 Sequestration ◽  
Co2 Storage ◽  
Early Period ◽  
Mineral Dissolution ◽  
Solution Ph ◽  
Sem Images ◽  
Deep Saline Aquifer ◽  
Rock Interaction ◽  
Geological Co2 Storage ◽  
Co2 Mineralization

CO2 mineralization is a long-term and secure solution for geological CO2 storage that primarily depends on the CO2–brine–rock interaction during CO2 sequestration in subsurface formations. In this study, lab experiments were conducted to investigate the CO2–brine–rock interaction over short timescales, and numerical simulations were performed to reveal dynamic interactions and equilibrium interactions by applying TOUGHREACT and PHREEQC, respectively. In the experiments, the main ions of HCO3− and Ca2+ were detected in the solution, and calcite dissolution and dawsonite precipitation were observed from SEM images. The simulation results showed that the CO2 dissolution and the solution pH were affected by the temperatures, pressures, types of solutions, and solution concentrations and were further influenced by mineral dissolution and precipitation. The results of the equilibrium simulation showed that the dissolved minerals were albite, anhydrite, calcite, Ca-montmorillonite, illite, K-feldspar, and chlorite, and the precipitated minerals were dolomite, kaolinite, and quartz, which led to HCO3−, K+, and Na+ being the main ions in solutions. The results of the dynamic simulation showed that calcite and dolomite dissolved in the early period, while other minerals began to dissolve or precipitate after 100 years. The dissolved minerals were mainly albite, kaolinite, K-feldspar, and chlorite, and precipitated minerals were Ca-montmorillonite, illite, and quartz. Anhydrite and pyrite did not change during the simulation period, and the main ions were HCO3−, Na+, Ca2+, and Mg2+ in the simulation period. This study provides an effective approach for analyzing the CO2–brine–rock interaction at different stages during CO2 storage, and the results are helpful for understanding the CO2 mineralization processes in deep saline aquifers.

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