drill bit cutter, drilling system for drilling a wellbore, and method for drilling a wellbore in a ground formation

摘要

A method and apparatus are described for rotatably mounting cutters in a drill bit. A hole is provided either directly in the drill bit or in a sleeve which is mounted in the drill bit. the hole includes a female screw thread, a circumferential groove, and one or more bearing surfaces. a hardened table cutter has a generally cylindrical body with a male screw thread, a circumferential groove, and one or more bearing surfaces. the cutter is engaged with the hole threads and then advanced until the male screw threads pass past the female screw threads. When the cutter is fully installed, the circumferential grooves provide relief for the screw threads so that the cutter can rotate freely within the hole.