Earth-boring drill bit with chisel cutter

Abstract

The present invention provides non-planar cutting tooth and a diamond drill bit. The non-planar cutting tooth and the diamond drill bit have great ability of impact resistance and balling resistance. According to the features of drilled formation, cutting teeth are arranged on the drill bit with different mode, which can improve the mechanical speed and footage of the drill bit.

What is claimed is: 
     
         1 . A drill bit to advance a borehole comprising: a
 a. bit body having a face on which is defined a plurality of blades extending from the face and separated by channels between the blades, each said blade supporting a plurality of first cutters: and   b. at least one of the plurality of blades supporting at least one chisel cutter, wherein the at least one chisel cutter has a top surface with two joining edges that extend to define an acute angle.   
     
     
         2 . The drill bit of  claim 1 , wherein at least one of the plurality of first cutters comprises polycrystalline diamond compact (“PDC”). 
     
     
         3 . The drill bit of  claim 1 , wherein at least one of the plurality of first cutters defines a depression extending from the top surface and towards a central longitudinal axis of the bit body. 
     
     
         4 . The drill bit of  claim 3 , wherein the at least one of the plurality of first cutters comprises polycrystalline diamond compact (“PDC”). 
     
     
         5 . The drill bit of  claim 1 , wherein at least one of the plurality of first cutters comprises hot isostatic segments. 
     
     
         6 . The drill bit of  claim 1 , wherein at least one of the plurality of first cutters comprises hot diamond elements coated with a metal binder. 
     
     
         7 . The drill bit of  claim 1 , wherein at least one of the plurality of first cutters comprises diamond elements sintered within a tungsten carbide matrix. 
     
     
         8 . The drill bit of  claim 7 , wherein the at least one of the plurality of first cutters comprises hot diamond elements coated with a metal binder. 
     
     
         9 . The drill bit of  claim 1 , wherein the at least one of the chisel cutters comprises hot isostatic segments. 
     
     
         10 . The drill bit of  claim 1 , wherein the at least one of the chisel cutters comprises hot diamond elements coated with a metal binder. 
     
     
         11 . The drill bit of  claim 1 , wherein the at least one of the chisel cutters comprises diamond elements sintered within a tungsten carbide matrix. 
     
     
         12 . The drill bit of  claim 7 , wherein the at least one of the chisel cutters comprises hot diamond elements coated with a metal binder. 
     
     
         13 . The drill bit of  claim 1 , wherein the at least one chisel cutter is positioned more distally from a central longitudinal axis of the bit body than at least one of the plurality of first cutters. 
     
     
         14 . The drill bit of  claim 13 , wherein the at least one chisel cutter is positioned more distally from the central longitudinal axis of the bit body than all of the plurality of first cutters. 
     
     
         15 . The drill bit of  claim 1 , further comprising a at least one tungsten carbide cutter supported by the at least one blade of the plurality of blades. 
     
     
         16 . The drill bit of  claim 15 , further comprising a plurality of tungsten carbide cutters supported by the at least one blade of the plurality of blades. 
     
     
         17 . The drill bit of  claim 16 , wherein the at least one chisel cutter is positioned more distally from a central longitudinal axis of the bit body than at least one of the of the plurality of tungsten carbide cutters. 
     
     
         18 . The drill bit of  claim 16 , wherein the at least one of the plurality of first cutters is positioned more proximally from a central longitudinal axis of the bit body than at least one of the of the plurality of tungsten carbide cutters. 
     
     
         19 . The drill bit of  claim 1 , wherein at least one of the plurality of blades supports a plurality of chisel cutters, wherein each chisel cutter has a top surface with two joining edges that extend to define an acute angle. 
     
     
         20 . A drill bit to advance a borehole comprising: a
 a. bit body having a face on which is defined a plurality of blades extending from the face and separated by channels between the blades, each said blade supporting a plurality of first cutters: and   b. At least two of the plurality of blades supporting at least one of chisel cutter, wherein the at least one chisel cutter has a top surface with two joining edges that extend to define an acute angle.