砂岩油层注水井酸化研究与应用

Development and Application of Method to Acidize Injection Well in Siliceous and Calcareous Sandstone Reservoirs

介绍一种适用于砂岩油层注水井深部酸化增注的新技术。配方由有机酸、NH_4HF_2、柠檬酸及助剂组成,具有反应速度慢、洗油和破乳等特点,适用于钙质、硅质砂岩油层注水井酸化。现场试验结果表明,该技术酸化增注成功率高,有效期长,是实现砂岩地层深部酸化的一种新途径。

A novel method to acidize injection well in siliceous and calcareous sandstone reservoirs was developed The acidizing fluid is composed of organic acid, NH_4HF_2, citric acid (as chelating agent) and corrosion inhibitor. The compositions of the aeidizing fluid were optimized using orthogonal design. The formula has low reaction speed, high oil- washing and demulsifying effects, it was suitable for siliceous and calcareous sandstone reservoirs. The field trial result showed that the method was a new approach to acidize sandstone with high success rate and long term.