The Stinger conical diamond element provides an innovative cutting structure enhancement that significantly increases a PDC bit’s performance. Located at the bit’s center, the element enables high-point loading to fracture rock more efficiently for increased durability and ROP.
In field tests comparing standard PDC bits and PDC bits fitted with a Stinger element, across a wide range of formations and operating parameters, the bits with a Stinger element demonstrated greater durability and stability while increasing ROP as much as 46%.
A PDC with a center-placed, conical-diamond element takes average ROP from 115 ft/h to 168 ft/h. Read case study
Because the rotational velocity of conventional PDC cutters decreases with their proximity to the center of the cutting structure, they are least effective at removing rock from the center of the borehole, especially in hard formations. And, since center cutters bear the highest load, operational and formation changes can cause destructive lateral vibrations and cutter damage.
Using the IDEAS integrated drill bit platform, bit designers shortened the blades that held the PDC bit’s low-velocity center cutters. The absence of these cutters allows a stress-relieved column of rock to develop while drilling, which the center-placed Stinger element continuously crushes and fractures, thereby improving drilling efficiency. And, the stability demonstrated by bits with a Stinger element is a positive dynamic that improves borehole quality and reduces stress on drillstring components, increasing BHA reliability.