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使用胜利油田的岩心对比了砂岩基质酸化中短岩心和长岩心流动模拟试验 ,试验证实常规土酸对地层造成较严重的酸化二次伤害 ;采用低浓度土酸酸化没有二次伤害 ,降低氢氟酸浓度有利于保护地层岩石骨架。通过对短岩心、长岩心酸化流动模拟试验结果的综合分析 ,得到如下新认识 :短岩心试验观察不到酸化二次反应、微粒运移所造成的伤害 ;而长岩心试验能更好地模拟现场酸岩反应过程 ,以便有效地深入研究酸液的综合性能和酸岩反应过程中的二次伤害机理 ,是综合研究酸化工作液配方和模拟试验优化施工参数的一种有效方法 ,能为现场酸化设计提供可靠的依据
Using the core of Shengli Oilfield, the simulation of short core and long core flow in sandstone matrix acidification was contrasted. The results showed that conventional earth acid caused serious acidification secondary damage to the formation. With low concentration of acidizing soil, there was no secondary injury and hydrogen fluoride Acid concentration is conducive to the protection of the formation rock skeleton. Through the comprehensive analysis of the results of simulating the flow of the short core and the long core, the following new understanding is obtained: the damage caused by the secondary reaction of acidification and the migration of particles can not be observed in the short core test; and the long core test can better simulate the scene Acid rock reaction process in order to effectively study the comprehensive performance of acid and acid rock reaction in the secondary injury mechanism is a comprehensive study of acidification working fluid formulation and simulation tests to optimize the construction parameters of an effective method for on-site acidification Design provides a reliable basis