研究了一种用于砂岩酸化的缓速酸液体系—以有机酸、磷酸、有机酸铵和氟化铵为主体的酸液体系 ,对其缓速机理进行了探讨并通过室内试验得出 :该体系与常规土酸相比与石英砂、大理石和膨润土的反应速率较慢 ,尤其对粘土含量高的砂岩地层缓速效果较好 ;并且该体系与砂岩和粘土反应后不改变固体物质的结构 ,可以络合多价金属离子 (如 :Fe3 + 和Al3 + ) ,不会产生二次沉淀 A slow acid system for sandstone acidification was studied. An acid system consisting mainly of organic acids, phosphoric acid, ammonium organic acid and ammonium fluoride was studied. The retarding mechanism of the system was discussed. The system has slower reaction rate with quartz sand, marble and bentonite than conventional earth acid, especially slow retarded sandstone formation with high clay content. The system does not change the structure of solid matter after reacting with sandstone and clay , Can complex multivalent metal ions (such as: Fe3 + and Al3 +), will not produce secondary precipitation