Client C used 20 pieces of 1613BIM-2 2.5 0.4 and 10 pieces of 1610BIM-2 3.0 0.4 to make an 8.5-inch 5-blade bit for drilling a well in Naiman Block, Inner Mongolia. The drill bit was drilled from 412 meters, and when it reached about 1,750 meters, the signal of the instrument disappeared. The drilling team checked the drill and found that the drill bit was not worn much, so it went down and continued to drill until it reached 2,265 meters. The client revealed that the well depth in this block is about 2,400 meters. In the past, only imported cutters could be used, and domestic cutters could not be used. The client was satisfied with the footage.