Polycrystalline diamond chisel type insert for use in percussion drill bits even for use in large hole percussion drilling of oil wells

• US 20180313162A1
• Filed: 06/25/2018
• Published: 11/01/2018
• Est. Priority Date: 01/22/2008
• Status: Active Grant

• Current Assignee: Victor Miller
• Original Assignee: William Brady
• Inventors: Brady, William J.
• Granted Patent: US 10,907,417 B2
• Time in Patent Office: Days
• CPC Class Codes: E21B 10/36 Percussion drill bits with helical conveying portion E21B10/445; characterised by wear resisting parts E21B10/46
• CPC Class Codes: E21B 10/46 characterised by wear resisting parts, e.g. diamond inserts
• CPC Class Codes: E21B 10/55 with preformed cutting elements
• CPC Class Codes: E21B 10/5673 having a non planar or non circular cutting face
• CPC Class Codes: E21B 10/58 Chisel-type inserts E21B10/485, E21B10/52 take precedence
• CPC Class Codes: E21B 17/1092 Gauge section of drill bits

Abstract

A polycrystalline diamond drill bit for percussion drilling, in small hole high silica ground is disclosed which has a cutting face having an inner flat face and an outer beveled peripheral surface, a number of first polycrystalline diamond tipped inserts having a first diameter inserted into the inner flat face and the outer beveled peripheral surface, and a number of second polycrystalline diamond tipped inserts having a second diameter inserted into the inner flat face, with the second diameter being different than the first diameter. The cutting angle and the radius of the tip of each insert in addition to the diameter of the inserts, provide for use of a machine thrust pressure and machine torque pressure at low ranges when the PCD bits are used in percussion drilling. The percussion drilling, with larger bits, may be used for rotary oil drilling, and operating at a machine thrust and torque of less than 20 Bar.

Claims

1. A rotary percussion drill bit, for drilling into ground, the drill bit formed having a body, the body capable of being secured with a drill shaft in preparation for a percussion drilling operation, the percussion drill bit including a series of inserts, said inserts being formed of a chisel, conical, or modified chisel insert designs;

the cutting face of each drill bit having an inner flat face and an outer beveled peripheral surface;

a number of the polycrystalline diamond tipped chisel inserts having a first diameter inserted into the inner flat face and the outer beveled peripheral surface;

a number of other polycrystalline diamond tipped chisel inserts having a second diameter inserted into the inner flat face, with the second diameter being different than the first diameter; and

whereby said percussion drilling is performed at low thrust and torque, below 28 Bar.

2. The percussion drill bit of claim 1, wherein the outer beveled peripheral surface is beveled at 28°

to 30°

with respect to the inner flat face and forms the reamer portion of the drill bit.

3. The percussion drill bit of claim 1, wherein the number of first inserts inserted into the outer beveled peripheral surface is eight.

4. The percussion drill bit of claim 1, wherein the number of first inserts inserted into the inner flat face is at least four.

5. The percussion drill bit of claim 1, wherein the number of second inserts inserted into the inner flat face is thirteen.

6. The percussion drill bit of claim 1, wherein the first diameter is between ⅝

″

to 1″

.

7. The percussion drill bit of claim 1, wherein the second diameter is between ⅜

″

to 1 inch″

.

8. The percussion drill bit of claim 1, wherein each of the first inserts have a cutting edge and the cutting edges are arranged at various angles.

9. The percussion drill bit of claim 1, wherein each of the second inserts have a cutting edge and the cutting edges are arranged at various angles.

10. The percussion drill bit of claim 1 further comprising a number of apertures in the inner flat face for providing a cleansing fluid.

11. A percussion drill bit, the drill bit formed having a body, the body capable of being secured with a drill shaft in preparation for a percussion drilling operation, the percussion drill bit comprising:

a cutting face having an inner frontal flat face, a first ring face portion which is stepped down from the inner frontal flat face, a second ring face portion which is stepped down from the first ring face portion, and an outer beveled ring face portion which is sloped relative to the second ring face portion; and

a number of polycrystalline diamond tipped inserts inserted into the inner frontal flat face, the first ring face portion, the second ring face portion, and the outer beveled ring face portion.

12. The percussion drill bit of claim 11, wherein the outer beveled ring face portion is beveled at 28°

with respect to the second ring face portion.

13. The percussion drill bit of claim 11, wherein the first ring face portion is stepped down from the inner frontal flat face up to ¼

″ and

the second ring face portion is stepped down from the first ring face portion by up to ¼

″

.

14. The percussion drill bit of claim 11, wherein the inner frontal flat face has seven inserts, the first ring face portion has six inserts, the second ring face portion has nine inserts, and the outer beveled ring face portion has ten inserts.

15. The percussion drill bit of claim 11, wherein the inserts are chisel type inserts and are up to 1″

in diameter.

16. A percussion drill bit, the drill bit formed having a body, the body capable of being secured with a drill shaft in preparation for a percussion drilling operation, the body having a cutting face having an inner flat face and outer beveled peripheral surface, the body and the cutting face being integrally formed, the percussion drill bit comprising:

a number of openings formed in the inner flat face and the outer beveled peripheral surface;

a number of first chisel inserts each having a tip comprising a polycrystalline diamond coating and a first diameter inserted into the inner flat face and the outer beveled peripheral surface; and

a number of second chisel inserts each having a tip comprising a polycrystalline diamond coating and a second diameter inserted into the inner flat face, with the second diameter being different than the first diameter;

each of the first inserts and the second inserts being arranged at a cutting angle of between about 0°

to 45°

off of the perpendicular to the arc of rotation of the percussion drill bit during performance of a drilling operation to achieve either a slicing or plowing mode of drilling; and

the percussion drill bit capable of operating at a machine torque pressure of less than 28 Bar, and a machine thrust pressure of less than 28 Bar.

17. The percussion drill bit of claim 16 wherein the outer beveled peripheral surface is beveled at an angle of approximately 28°

relative to the inner flat face.

18. The percussion drill bit of claim 16, wherein the first diameter is 1″

and the second diameter is up to 1″

.

19. The percussion drill bit of claim 16, wherein the number of first inserts inserted into the openings is seventy-one.

20. The percussion drill bit of claim 16, wherein the number of second inserts inserted into the openings is sixteen.

21. The percussion drill bit of claim 16, wherein the machine torque pressure generated is between about 8-12 Bar, and the machine thrust pressure generated is between about 12-20 Bar.

22. The percussion drill bit of claim 21, wherein select of the inserts are chisel type inserts, and select of the inserts are conical inserts.

23. The percussion drill bit of claim 21, wherein all of the inserts are all of the chisel type.

24. The percussion drill bit of claim 23, wherein said chisel type inserts are arranged at an angle of 0°

to 30°

off the perpendicular to the arc of rotation of said percussion drill bit.

25. The percussion drill bit of claim 16, wherein the drilling operation is for percussion rotary drilling employed in the drilling for oil.

26. The percussion drill bit of claim 16, wherein the drilling operation is for down the hole percussion rotary drilling employed in the drilling for oil.

30. The percussion drill bit of claim 17, wherein the outer beveled peripheral surface is beveled at an angle of 28°

relative to the inner flat face.

27. A rotary percussion drill bit for drilling in the ground, the drill bit formed having a body, the body capable of being secured with a drill shaft in preparation for a percussion drilling operation, the percussion drill bit comprising:

a cutting face having an inner flat face and an outer beveled peripheral surface;

a number of polycrystalline diamond tipped inserts inserted into the inner flat face and the outer beveled peripheral surface;

select of the polycrystalline diamond tipped inserts being chisel inserts, and which chisel inserts are arranged at an angle to the perpendicular of the arc of rotation of the drill bit and at an angle between 0° and

45°

; and

whereby said percussion drilling is performed at low thrust and low torque, below 28 Bar.

28. The percussion drill bit of claim 27, wherein all of the polycrystalline diamond tipped inserts are chisel inserts.

29. The percussion drill bit of claim 27, wherein other of the polycrystalline diamond lipped inserts are conical inserts.

31. A percussion drill bit, the drill bit formed having a body, the body capable of being secured with a drill shaft in preparation for a percussion drilling operation, the percussion drill bit comprising:

a cutting face having an inner frontal flat face, a first ring face portion is stepped down from the inner frontal flat face; and

a number of polycrystalline diamond tipped inserts inserted into the inner frontal flat face and the first ring face.

32. The percussion drill bit of claim 31 for use in percussion drilling, wherein the inserts are chisel type inserts.

33. The percussion drill bit of claim 31, wherein select of the inserts are chisel type inserts, and select of the inserts are conical type inserts.

34. A rotary percussion drill bit, for drilling in the ground, the drill bit formed having a body, the body capable of being secured with a drill shaft in preparation for a percussion drilling operation, the percussion drill bit comprising:

a cutting face having an inner flat face and an outer beveled peripheral surface;

a number of polycrystalline diamond chisel type inserts having a diameter applied to the inner flat face and the outer beveled peripheral surface of the drill bit;

each of the chisel type inserts having an upper transverse cutting edge, and the cutting edges of the chisel type inserts being arranged at a cutting angle of between about 0°

to 45°

off of the perpendicular of the arc of rotation of the percussion drill bit.

35. The percussion drill bit of claim 34, wherein select of said chisel type inserts of said percussion drill bit being arranged in a plowing mode, and aligned with the radius of the bit, others of said chisel type inserts arranged at an angle beyond 0°

and up to 30°

perpendicular to the arc of rotation of the percussion drill bit being in the slicing mode during performance of a percussion drilling operation.

36. The percussion drill bit of claim 35, wherein the diameter of each said percussion drill bit is between about 1¼

inches to 30 inches in diameter.

37. The percussion drill bit of claim 36, wherein said polycrystalline diamond tipped inserts being coated with polycrystalline diamond to a thickness of between about 0.010 inch to 0.060 inch.