Experimental study on optimization of PDC cutting teeth for conglomerate layer

Abstract

In order to obtain better drilling effect in the conglomerate layer, it is necessary to optimize the tooth shape and caster angle of PDC bit for the conglomerate layer. Single tooth rock breaking experiments are conducted on ordinary plane teeth, conical teeth and axe teeth in the conglomerate rock sample. Then the simulation analysis is conducted on the optimized axe teeth to optimize the optimal tooth surface angle of axe teeth. And the cutting simulation is conducted with ordinary plane teeth to verify the experimental results. The results show that the axe tooth has the highest cutting efficiency and the most stable stress in the conglomerate layer; the drilling effect of 140° axe tooth in conglomerate is better; and the cutting efficiency is the highest when 140° axe teeth are matched with 30° caster angle. Therefore, when optimizing the cutting tools for the conglomerate layer, it is necessary to reasonably select the teeth according to the formation characteristics. When applying axe teeth, in order to achieve high cutting efficiency, it is necessary to optimize the combination of tooth surface angle and caster angle.

Keywords

• conglomerate
• pdc cutting teeth
• tooth profile optimization
• special shaped teeth
• abaqus