The conglomerate develops in Taiyuan formation with high quartz content, which is the main target of Daniudi gas field. In the conglomerate section drilling with PDC, tooth breakage is often caused by big impact load and drilling efficiency is greatly reduced by bit tripping with higher drilling cost. According to the statistical analysis on the data and by the use of GD1306TX and FX55D bits in Taiyuan formation, the ROP is increased to shorten the drilling cycle. It is proved the cost per meter of GD1306TX bit is lower than FX55D bit by statistical cost analysis, GD1306TX bit is more suitable to be applied in abrasive Taiyuan formation.