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高温高压低渗油藏具有地层温度高、压力高、渗透率低的特点,正常封堵时因地层磨阻过大,施工压力过高导致封堵难以进行。采用无机低密度堵剂梯度注入的方法可有效降低地层磨阻,降低施工压力,保证地层封堵成功。
High temperature and pressure low permeability reservoirs have the characteristics of high formation temperature, high pressure and low permeability. Because of the excessive formation resistance during the normal blockage, the sealing pressure is too high and the sealing is difficult to carry out. The method of gradient injection with inorganic low density plugging agent can effectively reduce the formation abrasion resistance, reduce the construction pressure and ensure the success of formation sealing.