Experimental Study of Supercritical Carbon Dioxide Seepage Flow in Low Permeability Coal Seam
超临界CO2在低渗透煤层中渗流规律的实验研究

A series of seepage experiments of supercritical CO2 were carried out under different conditions of pore pressure and temperature based on a self-developed THM three field coupled seepage experiment system. Relationship among the flow velocity and the pressure gradient at different temperatures were obtained. That is non-Darcy seepage regulation of supercritical CO2 in low permeability seam, which means a positive exponential relation between the flow velocity and pressure gradient. The permeability coefficient increases along with the pressure gradient increase, and presents a positive exponential relationship; under the same volume stress and pressure gradient conditions, the higher the temperature is, the faster the flow velocity; when temperature approaches the critical point, the flow velocity and the permeability coefficient increase faster.