Pdc bit having split blades

Abstract

A drill bit for drilling a borehole in a formation, the drill bit including a bit body having a bit face including a cone region, a nose region, a shoulder region, and a gage region, at least one disjointed blade disposed on the bit face, the disjointed blade including a first section beginning proximate a central axis of the bit and extending less than full gage, and a second section beginning a selected distance from the central axis and extending to full gage, and a plurality of cutting elements mounted on the at least one disjointed blade is disclosed.

1 . A drill bit for drilling a borehole in a formation, the drill bit comprising:
 a bit body having a bit face comprising a cone region, a nose region, a shoulder region, and a gage region;   at least one disjointed blade disposed on the bit face, the disjointed blade comprising:
 a first section beginning proximate a central axis of the bit and extending less than full gage, and 
 a second section beginning a selected distance from the central axis and extending to full gage; and 
   a plurality of cutting elements mounted on the at least one disjointed blade.   
   
   
       2 . The drill bit of  claim 1 , further comprising at least one secondary blade, the secondary blade beginning a predetermined distance from the central axis and extending to full gage. 
   
   
       3 . The drill bit of  claim 1 , wherein the disjointed blade further comprises a third section beginning a second selected distance from the central axis and extending less than full gage. 
   
   
       4 . The drill bit of  claim 1 , wherein the second section is disposed on a radial plane of the first section. 
   
   
       5 . The drill bit of  claim 1 , wherein the second section behind a radial plane of the first section. 
   
   
       6 . The drill bit of  claim 5 , wherein a cutting element disposed on the second section trails a cutting element disposed on the first section. 
   
   
       7 . The drill bit of  claim 1 , wherein the first section is primarily disposed in the cone region. 
   
   
       8 . The drill bit of  claim 3 , wherein the second section is primarily disposed in the nose and shoulder regions and the third section is primarily disposed in the gage region. 
   
   
       9 . A drill bit for drilling a borehole in a formation, the drill bit comprising:
 a bit body having a bit face comprising a cone region, a nose region, a shoulder region, and a gage region;   at least one disjointed primary blade disposed on the bit face, the disjointed blade comprising:
 a first section disposed primarily in the cone region, and 
 a second section disposed primarily in at least one of the nose, shoulder, and gage regions; and 
   at least one cutting element disposed on the first section and at least one cutting element disposed on the second section.   
   
   
       10 . The drill bit of  claim 9 , wherein the second section partially overlaps the first section in a radial direction. 
   
   
       11 . The drill bit of  claim 9 , wherein the at least one disjointed primary blade further comprises a third section disposed primarily in at least one of the nose, shoulder, and gage regions. 
   
   
       12 . The drill bit of  claim 9 , wherein the second section is disposed on a radial plane of the first section. 
   
   
       13 . The drill bit of  claim 11 , wherein the third section is disposed on a radial plane of the first section. 
   
   
       14 . A drill bit for drilling a borehole in a formation, the drill bit comprising:
 a bit body having a bit face comprising a cone region, a shoulder region, and a gage region;   at least one blade disposed on the bit face, the blade beginning a selected distance from the central axis and extending to full gage;   at least one cutting structure disposed on the bit face in the cone region; and   at least one cutting element disposed on the at least one blade.   
   
   
       15 . The drill bit of  claim 15 , wherein the at least one blade begins at an outer circumference of the cone region. 
   
   
       16 . The drill bit of  claim 15 , wherein the at least one blade is disposed primarily in the nose, shoulder, and gage regions.