多氢酸酸化反应特征及动力学

利用自制多氢酸液XS-1进行静态岩粉溶蚀与岩心流动实验,通过SEM、ICP等实验考察了多氢酸的缓速性与预防二次沉淀性能,并研究了多氢酸与岩心反应动力学特性。结果表明,XS-1多氢酸液具有良好的缓速与预防二次沉淀性能,反应后残酸的极限浓度为0.296 1 mol/L,酸液有效作用时间为6～7h。在该多氢酸体系下岩心渗透率提高至4.15倍,在此条件下以酸岩反应动力学参数模型建立动力学方程,反应速率比同条件下普通酸液小,进一步证明多氢酸具有一定的缓速性。

Acidification characteristics and kinetics of multi-hydrogen acid

In this study, the self-made multi-hydrogen acid solution XS-1 is used for static rock powder dissolution and core flow experiment. Using SEM and ICP, the retarding property of multi-hydrogen acid and its performance in preventing secondary precipitation are investigated to study the kinetics characteristics of the reaction between multi-hydrogen acid and core. The results show that the multi-hydrogen acid solution XS-1 has a good performance in retardation and secondary precipitation prevention. After reaction, the limit concentration of residual acid is 0.296 1 mol/L and the effective acting time of acid is 6-7 h.The core permeability is increased to 4.15 times in the multi-hydrogen acid system. Under such condition, the kinetics parameter model of acid and rock reaction is applied to establish the kinetic equation; the reaction rate constant is smaller than that of common acid under the same condition, further proving that multi-hydrogen acid has a certain retarding property.