Claw shaped gouging cutter for fixed cutter drill bit

Abstract

A cutter for use with a drill bit includes: a substrate for mounting in a pocket of the drill bit and made from a cermet material; and a head made from a superhard material, mounted to the substrate, and having a chisel or frusto-cone inclined relative to a longitudinal axis of the cutter by an attack angle ranging between fifteen and sixty degrees.

1 . A cutter for use with a drill bit, comprising:
 a substrate for mounting in a pocket of the drill bit and made from a cermet material; and   a head made from a superhard material, mounted to the substrate, and having a chisel or frusto-cone inclined relative to a longitudinal axis of the cutter by an attack angle ranging between fifteen and sixty degrees.   
     
     
         2 . The cutter of  claim 1 , wherein a height of the head is greater than or equal to a thickness of the substrate. 
     
     
         3 . The cutter of  claim 1 , wherein the chisel or frusto-cone is the chisel having an edge. 
     
     
         4 . The cutter of  claim 2 , wherein with a length of the edge ranges between one percent and thirty percent of a diameter of the substrate. 
     
     
         5 . The cutter of  claim 2 , wherein the edge is sharp. 
     
     
         6 . The cutter of  claim 2 , wherein the edge is planar. 
     
     
         7 . The cutter of  claim 2 , wherein the edge is wedge-shaped. 
     
     
         8 . The cutter of  claim 1 , wherein the chisel or frusto-cone is the frusto-cone having a tip. 
     
     
         9 . The cutter of  claim 8 , wherein a diameter of the tip ranges between five percent and thirty percent of a diameter of the substrate. 
     
     
         10 . The cutter of  claim 1 , wherein the head is made from a polycrystalline superhard material. 
     
     
         11 . A bit for drilling a wellbore, comprising:
 a shank having a coupling formed at an upper end thereof;   a body mounted to a lower end of the shank; and   a cutting face forming a lower end of the bit and comprising:
 a blade protruding from the body; and 
 the cutter of  claim 1 , 
   wherein:
 the substrate is mounted in the pocket formed in the blade, and 
 the pocket is transverse to a bearing face of the blade. 
   
     
     
         12 . A cutter for use with a drill bit, comprising:
 a substrate for mounting in a pocket of the drill bit and made from a cermet material; and   a head made from the cermet material, mounted to the substrate, and having a chisel or frusto-cone inclined relative to a longitudinal axis of the cutter by an attack angle ranging between fifteen and sixty degrees.