Usually 12%HCl+3%HF+additive is used for acidization in sandstone formation. But for special formation,such as low damage and low reservoir pressure etc. ,high-concentration mud acid is adopted.

• 砂岩地层酸化解堵一般采用 1 2%25HCl+ 3%25HF +添加剂的标准土酸体系 ,但对特殊储层 ,如伤害半径小、油层能量低等储层 ,为达到特殊的酸化目的 ,可以采用高浓度土酸进行酸化。