Stress crack acidification is called acid stress. In acid pressure construction, if acid pressure is used directly, acid is not only a pressure crack fluid, but also a liquid that reacts with the rock wall of pressure cracks; if non-reactive pre-hydraulic pressure cracks are used, the acid will flow along the water Cracks flow and react with cracked walls. Because of the uneven ground, the reaction between the cracked wall and the acid is irregular. This acid-etched rock wall will form an acid-etched earthworm hole with high conductivity after the fracture is closed, thereby improving the seepage capacity of…