砂岩基质酸化中的短岩心和长岩心流动模拟试验研究

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，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

Study on short-core and long-core flow simulation tests during sandstone matrix acidizing

The short core and long core flow simulation tests with cores of Shengli Oilfield during sandstone matrix acidizing are compared in this paper.The experimental results show that conventional mud acid can result in serious secondary damage.Low concentration mud acid can decrease secondary damage and decrease Hfconcentration it is benefit to protecting formation rock matrix .We can gain new conclusions by comparing the test results of short core and long core.Short core flow tests can not observe the damage of acidizing secondary reaction and particle migration,long core flow tests can effectively simulate acidic rock reaction.The long core flow test is an effective method to study comprehensive performance of acid fluid and secondary damage mechanism during acidic rock reaction.