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在Bryant的最新砂岩基质酸化模型 (1991)基础上 ,提出了由不与石英反应而选择性地与粘土反应的氟硅酸(H2 SiF6)、可减少硅胶和氟硅酸盐沉淀的盐酸 (HCl)组成的混合酸化液 ,用于解除砂岩储层深部粘土堵塞。通过岩心流动实验考察了H2 SiF6/HCl混合酸液体系与含粘土 14%的砂岩储层岩心之间的反应 ,实验结果如下 :①该体系适用于解除砂岩油层深部粘土造成的堵塞 ,解堵效果优于常规土酸 (3%HF/ 12 %HCl) ;②温度越高 (30— 12 0℃ ) ,该体系与岩心之间的反应速度越快 ;③对于H2 SiF6/ 12 %HCl体系 ,H2 SiF6浓度 (3%— 10 % )控制体系与岩心间的反应速度 ,对于解除深部粘土堵塞 ,H2 SiF6的最佳浓度为 6 %。
Based on Bryant’s latest model of sandstone matrix acidification (1991), fluorosilicic acid (H2SiF6), which reacts with clay selectively without reaction with quartz, hydrochloric acid (HCl ) Mixed acid solution for the dissolution of sandstone reservoir blockage of deep clay. The reaction between H2SiF6 / HCl mixed acid system and 14% sandstone reservoir core containing clay was investigated by core flow experiments. The experimental results are as follows: ①The system is suitable for removing clogging and plugging effect caused by deep clay in sandstone reservoir (3% HF / 12% HCl); ②The higher the reaction temperature (30-1200 ℃), the faster the reaction between the system and the core; ③For H2 SiF6 / 12% HCl system, The SiF6 concentration (3% - 10%) controls the reaction rate between the core and the core, and the optimal concentration of H2SiF6 is 6% for the removal of deep clay clogging.