Dispersion of supercritical CO2 and CH4 in consolidated porous media for enhanced gas recovery simulations

Enhanced gas recovery with CO2 sequestration: The effect of medium heterogeneity on the dispersion of supercritical CO2–CH4

“…The breakthrough profiles obtained for the Estaillades carbonate core were regressed to Equation (3) and the resultant fit quality was comparable to those obtained for sandstone cores during our previous studies (Honari et al, 2013).…”

“…Thus a revised model (MobileImmobile Model) was successfully used for this core to obtain dispersion coefficients characteristic of the eventual asymptotic regime. Both heterogeneous carbonate rocks considered exhibit higher dispersion than that observed in previously-measured homogeneous sandstone cores (Honari et al, 2013) …”

“…Finally, the tubing upstream and downstream of the cores and the inhomogeneous velocity profiles at the core entrance and exit contribute additional mixing and erroneously increase the apparent dispersion. The correction for the erroneous contribution of these effects to dispersion associated with our experimental apparatus (as measured previously (Hughes et al (2012) and Honari et al (2013)) was applied to our new results. The concentration profiles were measured at the same conditions of T, p and flow rate for short and long Berea rock cores.…”

“…The core flood apparatus, shown in Figure 2, was designed to allow pulse injection experiments to be conducted through vertically-oriented cores at reservoir conditions as detailed by Hughes et al (2012) and Honari et al (2013). After being placed in the core holder, the core was initially saturated with CH 4 and pressurized to the test pressure using the injection syringe pump.…”

“…We recently presented the measured dispersion coefficients (K L ) of CO 2 and CH 4 for two sandstone cores (Berea and Donnybrook) over a range of pressure, temperature and interstitial velocities (Honari et al, 2013). Those highly reproducible data were used to obtain the characteristic mixing length for the sandstone samples and a generalized correlation was developed for reservoir simulators; however the data and hence the resulting correlation were 5 limited to the sandstone cores only.…”