Improved pressure decay method for measuring CO2-water diffusion coefficient without convection interference

Diffusivity of CO2 in H2O: A Review of Experimental Studies and Molecular Simulations in the Bulk and in Confinement

“…Finally, the experimental data of Basilio et al 124 performed at 293 K and 1.5 MPa have higher values than the data from Belgodere et al 117 Figure 7 shows the effect of pressure on the diffusion coefficient of CO 2 in various brines. A mixed picture is obtained regarding the effect of pressure.…”

“…The experimental data (orange symbols) of Chiquet 166 fall in the range ± (25−50)% from the SA correlation. Finally, the experimental data (black symbols) of Tewes and Boury, 167 Li et al, 168 Basilio et al, 124 116 and circles the experimental data by Cadogan et al 113 The red solid line denotes the calculations of the diffusion coefficient of CO 2 in H 2 O at various temperatures and 20 MPa using the correlation of Mutoru et al, 61 and the orange solid line denotes the calculation using the correlation of Versteeg et al 161 The dashed lines denote the correlations examined in this work (SA-type: magenta; VTF-type: blue; ARR-type: black): (a) Extrapolation and comparison with recent experimental data at higher pressures. (b) The parameters for the three correlations are re-evaluated to include recent experimental data (Lu et al, 116 Cadogan et al 113 ).…”

“…Li et al 150 concluded that the diffusive tortuosity factor of the examined cores was about 10. Basilio et al 124 used the pressure decay method to measure the molecular CO 2 diffusion coefficients in pure water, at 293.15 K, using capillary tubes, packed with glass beads with three different grain size ranges: (i) 45−90 μm, (ii) 200−300 μm, and (iii) 425−560 μm. The use of capillary tubes in this experimental approach allows for the disregard of density-induced convection during the diffusion process.…”

“…Instead, we provide a brief description of the experimental methods that have been used for the measurement of gas diffusivity in liquids, focusing primarily on those used for CO 2 diffusing in H 2 O or brines. Such experimental methodologies include the following: (1) diaphragm cells, − (2) wetted surface absorbers, , (3) laminar jets, − (4) capillary cells, , (5) Taylor dispersion, − (6) laser-induced fluorescence, (7) dynamic light scattering (DLS), (8) in situ Raman spectroscopy, , (9) nuclear magnetic resonance (NMR) spectroscopy using pulsed field gradients (PFG), − (10) pH-based methods, (11) pressure decay methods, − and (12) dynamic interfacial tension method . Additional methodologies used for measuring gas diffusion in other liquids (e.g., CO 2 in heavy oil or bitumen) include, but are not limited to, the following: (1) the dynamic pendant drop volume analysis (DPDVA), (2) the dynamic pendant drop surface analysis (DPDSA), (3) X-ray computer-assisted tomography (CAT) scanning, , and (4) magnetic resonance imaging (MRI) …”

“…Therefore, such an approach makes the calculation of the diffusion coefficient dependent on how detailed the mathematical model used for the analysis is . This issue becomes more evident when the pressure decay method is used to measure the diffusivity of CO 2 in H 2 O where the density-driven convection needs to be considered. , A number of studies ,,− used the pressure decay method for the measurement of the diffusivity of CO 2 in H 2 O.…”