The most widely used in oil drilling and geological drilling or cone bit. Cone bit with the impact of the rotation, crushed and broken formation rock shear effect, so the cone bit to adapt to the soft, hard of various strata.
Cone number can be divided into single cone, double cone, cone and cone bit. At present, domestic and international use most the most common of the three-cone drill.
In particular, the emergence of the jet cone bits and long nozzle cone bit roller cone bit drilling speed is greatly improved, a major revolution in the history of the development of the cone bit. Cone bits can be divided according to tooth type milling steel tooth droller cone bit, tipped (cone insert installed carbide teeth) cone bit and so on.