Paper No. 300-14
Presentation Time: 5:00 PM
IN-SITU RAMAN SPECTROSCOPIC STUDY OF THE DISSOLUTION AND REACTION PROCESS DURING CO-INJECTION SO2 WITH CO2 INTO PORE SPACE AT CONDITIONS RELEVANT TO CARBON CAPTURE AND STORAGE
Co-injection SO2 with CO2 can reduce the total capture cost, but result to highly reactive water-rock interactions and increase risk of leakage from the storage site. We used Raman spectroscopic imaging method to monitor the multiphase reactive transport processes of co-injection of SO2 together with CO2 in optical cell and micro-model at conditions relevant to carbon capture and storage (CCS). Based on a large number of calibration experiments, we established the quantitative relationship between the Raman spectral parameters and the concentration of SO2-CO2, determined the phase equilibria of the ternary mixture of SO2−CO2−H2O, and observed the dynamic partitioning of the gases between the CO2 rich phase and aqueous phase. Additional, in order to understand the interaction among acid gas, water, and rocks, we observed the reaction of CO2-SO2 mixtures with water saturated silicate particles, we found that SO2 can accelerate the dissolution of silicate and results of precipitation of sulfates, when SO2 is consumed, carbonate precipitation will be produced. Such reaction definitely affects the pore structure and permeability of rocks at some injection sites.