Bushing and screw plug loss, to avoid unnecessary losses (as we've suffered losses before), the screw plug was tightened too much during installation, and it couldn't be unscrewed during machine repair. Methods such as using an extended lever, heating, and removing the oil pan with a vice were tried, but they took a long time and were ineffective. In response, we introduce an effective method: Use one 1kg hammer and one 200mm long, dull chisel. Strike the chisel with the hammer while holding it at a 45° angle to the oil bottom plug. This method is suitable for field tests of oil seals in mines with no significant drift of underground tracer agents during well closure. The model considers the injection conditions of the test segment and corrects for secondary tracers in the injection fluid. This interpretation model is cost-effective with high precision.