PDC drill bits comprise a bit body and cutting elements known as PDC cutters. Typically, the bit body is made of steel or matrix materials, while the cutters consist of synthetic diamond layers bonded to a tungsten carbide substrate. This combination ensures the necessary hardness and toughness to penetrate various rock formations effectively.
PDC cutters are renowned for their hardness, second only to natural diamond. They exhibit excellent thermal stability and wear resistance, making them suitable for high-speed drilling operations. The polycrystalline nature of the diamond ensures uniform wear, enhancing the longevity of the bit.
PDC drill bits operate through a shearing action. As the bit rotates, the PDC cutters scrape against the rock, breaking it into small fragments. This shearing mechanism is more efficient than the crushing action of traditional roller cone bits, resulting in faster drilling rates and smoother boreholes.