Study on the Wear Law of PDC Bits in Conglomerate

A simplified model of dual-cutter PDC bits was established to model how the PDC bit is being worn when drilling into dense conglomerate. Then the rock breaking process was investigated using an Archard wear model and finite element software, and how the backward inclination, temperature, linear speed and WOB of the PDC bit influence the bit wear was analyzed. The results show that, the wear rate of cutter increases slowly when the backward inclination is between 15° and 20°, and reaches the maximum value at 20°;the wear rate increases rapidly after the temperature reaches 300 ℃;the linear speed and the WOB are proportional to the wear. Finally, sensitivity analysis by orthogonal tests shows that the influence on the bit wear is linear speed, backward inclination, temperature, and WOB in turn. This study is helpful to how to update drilling parameters and extend the service life of a PDC bit when drilling conglomerate layers.