Waterflooding of gas-condensate fluids in cores above and below the dewpoint

The recovery of gas and condensate by advancing water has been studied experimentally at reservoir conditions in sandstone cores. Water-wet cores saturated with gas condensate were flooded with water above and below the dew-point at different rates and pressure levels. The rates of gas, condensate and water recovery, and the residual saturation of fluids have been measured and the results are presented. The recovery of gas and condensate depended on the saturation and distribution within the pores prior to waterflooding. The higher the condensate saturation above the minimal value of the critical condensate saturation achievable in the core, the higher the recovery of condensate. No increase in condensate production accompanied water breakthrough, even at conditions where gravity drainage of condensate was dominant.