Data from: Experimental study of the supercritical CO2 diffusion coefficient in porous media under reservoir conditions

Reliable measurement of CO2 diffusion coefficient in consolidated
oil-saturated porous media is critical for design, performance of carbon
capture and storage (CCS) and CO2 enhanced oil recovery (EOR) project. In
this study, a thorough experimental investigation on supercritical CO2
diffusion in n-decane saturated Berea core (50 and 100 mD) was conducted
at elevated pressure (10 to 25 MPa) and temperature (333.15 to 373.15 K),
which simulated the real reservoir condition. Supercritical CO2 diffusion
coefficients in Berea core were calculated by a model appropriate for
diffusion in porous media based on Fick’s law. The results show that with
an increase in pressure, temperature and permeability, the supercritical
CO2 diffusion coefficient increases correspondingly. The supercritical CO2
diffusion coefficient first increases slowly at 10 MPa and then grow
significantly with the increase of pressure. The effect of temperature
becomes weaker at elevated pressure condition. And the effect of
permeability keeps steady despite of temperature change in experiments.
The effect of gas state and porous media on supercritical CO2 diffusion
coefficient is further discussed by comparing the results in this study
with previous research. Based on the experimental results, an empirical
correlation for supercritical CO2 diffusion coefficient in n-decane
saturated porous media is developed. The experimental results contribute
to the study of supercritical CO2 diffusion in compact porous media.