Abstract
Advanced water injection can keep a high level of formation pressure, reduce the damage of permeability caused by the drop of formation pressure, and improve the oil displacement efficiency. Through pressure sensitive experiment and Micro-CT scan method, this paper study the influence on rock parameters by formation pressure. The results show that permeability decreases greatly in depressurization development, the permeability restores a small degree after restoring pressure, the change of coordination number and pore throat radius is similar with permeability, and porosity is not sensitive to pressure. Through the research on the influence of oil displacement efficiency by drive pressure, the results show that advanced water injection can improve the oil phase relative permeability, the average increase rate is 5.02%, and also increase oil displacement efficiency, the increase rate is 1%. The core fluorescence images indicate that the remaining oil by advance water injection is obviously less than the conventional production.
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