A NEW METHOD TO DETERMINE CRITICAL GAS SATURATION AND RELATIVE PERMEABILITY DURING DEPRESSURIZATION IN THE NEAR-WELLBORE REGION

摘要

Depressurization of a virgin or waterflooded oil reservoir results in the appearance of a solution gas saturation. Above a saturation threshold, this gas becomes mobile and can be produced. Knowledge of the critical gas saturation (Sgc) and the subsequent relative permeabilities (Kr) in the far field and the near-wellbore region has a tremendous impact on gas and oil production forecasts.