It's widely used for oil testing, workover, testing, layer reconstruction and others. Safe and reliable, low cost, multiple constructions. Connect retrievable bridge plug with the bottom of the hydraulic transportation tools, put downward bridge plug to designed depth, and give pressure to the pipe column with pump. Pull the tension rods (ring) of the plug to break (cut off) it and realize sealing. The transportation tool is pulled out of the well with the column. If necessary, put the special plug fishing tool down the well to unseal and get the plug out of the well.