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Injection and Scan Specifications
Contexts in source publication
Context 1
... injections, the back pressure regulator was set to 1250 PSI and fluid 146 injection pumps were set to pump at constant flow rate (per Table 1); the 147 resulting injection pressure (measured via the pump transducer) was mon-148 itored to ensure that pore pressure did not exceed confining pressure, and 149 the values recorded. After the injection was halted, the pore pressure was 150 allowed to relax until it reached a stable value; then, the injection pump 151 was again set to maintain constant pore pressure at 1250 PSI and the back 152 pressure regulator increased to 1265 PSI (to prevent additional flow during 153 scanning periods). ...Context 2
... beam 165 parameters were similar to those used by [23]; i.e. 120 keV, 60 uA, and a 166 0.5 mm aluminum filter applied to the detector. For some scans (indicated 167 in Table 1 and Figure 1), data was acquired using high-resolution region of 168 interest (ROI) imaging [35,36]. ROI imaging uses manipulation of the stage 169 geometry to acquire two separate scans at different resolution and field-of- jection states, some scans were acquired using only the "overview" geometry; 183 these "OV" data had a resulting resolution of 19.5 micron, but only required ...Similar publications
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Citations
Understanding the mass transfer of CO2 into formation brine both qualitatively and quantitatively is important for improving the security of geologic carbon sequestration. In this study, quasi-dynamic X-ray micro-computed tomographic (MCT) imaging was used to track the time-evolution of supercritical CO2 (scCO2) clusters in a sandstone throughout brine injection. A cluster-matching workflow enabled the identification of depletion, merging, and snap-off of the scCO2 clusters, and subsequently the mass transfer coefficient of individual scCO2 clusters was found to range between 3.0×10−5 and 3.5×10−4 mm/s. The macroscopic average mass transfer coefficient was estimated as 1.4×10−4 mm/s. For application to geologic carbon sequestration, these values give an indication of the range of mass transfer coefficients that may be expected for similar state and flow conditions. With the macroscopic average mass transfer coefficient evaluated, we back-calculated the in-situ CO2 concentration field for brine, which provides quantitative insight of the distribution of dissolved CO2 in the sample. Despite slow injection rate (Ca = 10−7), mobilization of small scCO2 clusters was also observed, and was attributed to the combined effect of incomplete dissolution of snapped-off clusters and the reduction in the fluid-fluid interfacial tension (IFT) due to the high local CO2 concentration in brine accompanying scCO2 dissolution. This highlights the coupling of dissolution and mobilization processes and demonstrates the need to understand these interlinked dynamics to improve CO2 storage in geological formations.
