DRAG BIT WITH UTILITY BLADES

• US 20110253457A1
• Filed: 04/19/2011
• Published: 10/20/2011
• Est. Priority Date: 09/06/2007
• Status: Active Grant

• Current Assignee: Smith International Incorporated (Schlumberger NV)
• Original Assignee: Smith International Incorporated (Schlumberger NV)
• Inventors: Douglas, Charles H. S. III, Durairajan, Bala, Zhang, Youhe, Shen, Yuelin
• Granted Patent: US 8,869,919 B2
• Time in Patent Office: Days
• US Class Current: 175/397
• CPC Class Codes: E21B 10/43 characterised by the arrangement of teeth or other cutting elements
• CPC Class Codes: E21B 10/60 characterised by conduits or nozzles for drilling fluids for roller bits E21B10/18; for percussion drill bits E21B10/38
• CPC Class Codes: E21B 12/02 Wear indicators

Abstract

A drill bit is disclosed herein, the drill bit having a bit body, a plurality of cutting blades extending radially from the bit body and having cutting elements disposed thereon, the plurality of cutting blades forming a cutting blade gage pad diameter configured to contact a formation, and a plurality of raised volumes of material extending from the bit body and devoid of cutting elements, the plurality of raised volumes of material forming a gage pad diameter configured to contact the formation, wherein the plurality of cutting blades and the plurality of raised volume of material are circumferentially spaced having fluid courses that extend therebetween.

Claims

1. A drill bit comprising:

a bit body;

a plurality of cutting blades extending radially from the bit body and having cutting elements disposed thereon, the plurality of cutting blades forming a cutting blade gage pad diameter configured to contact a formation; and

a plurality of raised volumes of material extending from the bit body and devoid of cutting elements, the plurality of raised volumes of material forming a gage pad diameter configured to contact the formation;

wherein the plurality of cutting blades and the plurality of raised volume of material are circumferentially spaced having fluid courses that extend therebetween.

2. The drill bit of claim 1, wherein the plurality of cutting blades and the plurality of raised volume of material are configured in an alternating arrangement about a center of the bit body.

3. The drill bit of claim 1, wherein the gage pad diameter of the raised volume of material is less than the cutting blade gage pad diameter.

4. The drill bit of claim 3, wherein the gage pad diameter of the raised volume of material is about 0.01 inches to about 0.15 inches less than the cutting blade gage pad diameter.

5. The drill bit of claim 1, wherein a gage pad extends axially into a gage region of the bit body from each of the plurality of cutting blades, wherein each gage pad has a gage surface, a cutter-proximal side, a blade end side, a leading side and a trailing side, and wherein each of the plurality of raised volume of material has a top surface, a face-proximal side, a face-distal side, a leading side, and a trailing side.

6. The drill bit of claim 5, wherein the face-proximal side of each of the raised volume of material is disposed axially between the cutter-proximal side and the blade end side of the gage pads.

7. The drill bit of claim 5, wherein the arc length distance between the leading side of at least one of the raised volumes of material and the trailing side of an adjacent gage pad is equal to the arc length distance between the trailing side of the at least one raised volume of material and the leading side of another adjacent gage pad.

8. The drill bit of claim 5, wherein the arc length distance between the leading side of at least one of the raised volumes of material and the trailing side of an adjacent gage pad is less than the arc length distance between the trailing side of the at least one raised volume of material and the leading side of another adjacent gage pad.

9. The drill bit of claim 5, wherein the arc length distance between the leading side of at least one of the raised volumes of material and the trailing side of an adjacent gage pad is greater than the arc length distance between the trailing side of the at least one raised volume of material and the leading side of another adjacent gage pad.

10. The drill bit of claim 5, wherein each raised volume of material comprises less than 25 percent of the arc length between a pair of adjacent gage pads.

11. The drill bit of claim 1, wherein the drill bit comprises at least two and less than five cutting blades.

12. The drill bit of claim 1, wherein at least one of the raised volumes of material has a roller that contacts the formation.

13. A drill bit comprising:

a bit body having a face, a gage region, and a rotational axis extending therethrough;

a plurality of cutting blades extending radially from the rotational axis and extending axially from the face to the gage region, the plurality of cutting blades comprising cutting elements disposed thereon;

a plurality of gage pads extending axially into the gage region from the plurality of cutting blades, wherein each gage pad has a gage surface, a cutter-proximal side, a blade end side, a leading side and a trailing side;

at least one stabilization pad, each stabilization pad having a top surface, a face-proximal side, a face-distal side, a leading side, and a trailing side;

wherein each stabilization pad is disposed circumferentially about the bit body in the gage region between a pair of adjacent gage pads; and

wherein each stabilization pad comprises less than 50 percent of the arc length between the pair of adjacent gage pads;

wherein the drill bit comprises at least two and less than five blades.

14. The drill bit of claim 13, wherein the face-proximal side of the at least one stabilization pad is disposed axially between the cutter-proximal side and the blade end side of the gage pads.

15. The drill bit of claim 13, wherein the arc length distance between the leading side of the stabilization pad and the trailing side of one of the pair of adjacent gage pads is equal to the arc length distance between the trailing side of the stabilization pad and the leading side of the other of the pair of adjacent gage pads.

16. The drill bit of claim 13, wherein the arc length distance between the leading side of the stabilization pad and the trailing side of one of the pair of adjacent gage pads is less than the arc length distance between the trailing side of the stabilization pad and the leading side of the other of the pair of adjacent gage pads.

17. The drill bit of claim 13, wherein the arc length distance between the leading side of the stabilization pad and the trailing side of one of the pair of adjacent gage pads is greater than the arc length distance between the trailing side of the stabilization pad and the leading side of the other of the pair of adjacent gage pads.

18. The drill bit of claim 13, wherein the radial height from the bit body surface to the gage surface is equal to the radial height from the bit body surface to the top surface of the at least one stabilization pad;

wherein the entire gage surface of each gage pad and the entire top surface of each stabilization pad is at gage.

19. The drill bit of claim 13, wherein the radial height from the bit body surface to the top surface of the at least one stabilization pad is less than the radial height from the bit body surface to the gage surface of each gage pad,

wherein the entire gage surface of each gage pad is at gage;

and

wherein the entire top surface of each stabilization pad is at less than gage.

20. The drill bit of claim 13, wherein the radial height of the top surface of the at least one stabilization pad tapers from gage to a distance less than gage.

21. The drill bit of claim 20, wherein the radial height of the top surface at the face-proximal side of the at least one stabilization pad is at gage and the radial height of the top surface at the face-distal side of the at least one stabilization pad is at the distance less than gage, and wherein the radial height tapers at a substantially constant rate from the face-proximal side to the face-distal side.

22. The drill bit of claim 13, wherein each stabilization pad comprises less than 25 percent of the arc length between the pair of adjacent gage pads.

23. The drill bit of claim 13, wherein at least one stabilization pad has a roller disposed in the top surface.