Dispersion characteristics of CO2 enhanced gas recovery over a wide range of temperature and pressure

摘要

In this study, experimental investigation of gas dispersion in a broader temperature and pressure range were performed in both horizontal and vertical orientations. Three types of glass sand with different particle sizes were used in experiments at temperatures 60-150 degrees C and pressures 10-30 MPa. The effects of temperature, pressure, injection flow rate, gravity, and sand particle size on the dispersion under reservoir conditions were studied in detail. The results indicate that dispersion was considerably affected by temperature in the studied range. High injection flow rates also resulted in larger dispersion coefficients and early breakthrough behavior. In supercritical region, the effects of pressure on dispersion in horizontal and vertical orientations were completely opposite in the presence of gravity, with the horizontal dispersion coefficients being much higher than the vertical ones. In addition, dispersion coefficients exhibited weak dependence on the particle size in the unconsolidated cores at low interstitial velocity.