Retaining Element for a Jack Element

• US 20080011521A1
• Filed: 07/09/2007
• Published: 01/17/2008
• Est. Priority Date: 11/21/2005
• Status: Active Grant

• Current Assignee: Schlumberger Technology Corporation (Schlumberger NV)
• Original Assignee: NovaDrill, Inc. (Schlumberger NV)
• Inventors: Hall, David, Wilde, Tyson, Leany, Francis, Black, Boyd, Fox, Joe
• Granted Patent: US 7,506,706 B2
• Time in Patent Office: Days
• US Class Current: 175/432
• CPC Class Codes: E21B 10/26 Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers percussion drill bits with leading portion E21B10/40
• CPC Class Codes: E21B 10/62 characterised by parts, e.g. cutting elements, which are detachable or adjustable E21B10/64 takes precedence; for roller bits E21B10/20; for augers E21B10/44
• CPC Class Codes: E21B 7/06 Deflecting the direction of boreholes
• CPC Class Codes: E21B 7/064 specially adapted drill bits therefor
• CPC Class Codes: E21B 7/065 using oriented fluid jets

Abstract

A drill bit having a bit body intermediate a shank and a working face having at least one cutting insert. A bore is formed in the working face co-axial within an axis of rotation of the drill bit. A jack element is retained within the bore by a retaining element that intrudes a diameter of the bore.

Claims

1. A drill bit comprising;

a bit body intermediate a shank and a working face comprising at least one cutting insert;

a bore formed in the working face co-axial within an axis of rotation of the drill bit, and

a jack element retained within the bore by a retaining element that intrudes a diameter of the bore.

2. The bit of claim 1, wherein the retaining element is a cutting insert, a snap ring, a cap, a sleeve or combinations thereof.

3. The bit of claim 1, wherein the jack element comprises a polygonal shaft.

4. The bit of claim 1, wherein the retaining element intrudes a diameter of the shaft.

5. The bit of claim 1, wherein the retaining element comprises a material selected from the group consisting of gold, silver, a refractory metal, carbide, tungsten carbide, cemented metal carbide, niobium, titanium, platinum, molybdenum, diamond, cobalt, nickel, iron, cubic boron nitride, and combinations thereof.

6. The bit of claim 1, wherein the retaining element is at least partial attached to the working surface of the drill bit.

7. The bit of claim 1, wherein the retaining element is disposed within the bore.

8. The bit of claim 1, wherein the retaining element is complimentary to the jack element.

9. The bit of claim 1, where in the retaining element has a bearing surface.

10. The bit of claim 1, wherein the jack element comprises a material selected from the group consisting of gold, silver, a refractory metal, carbide, tungsten carbide, cemented metal carbide, niobium, titanium, platinum, molybdenum, diamond, cobalt, nickel, iron, cubic boron nitride, and combinations thereof.

11. The bit of claim 1, wherein the jack element comprises a coating of abrasive resistant material comprised of a material selected from the following including natural diamond, polycrystalline diamond, boron nitride, tungsten carbide or combinations thereof.

12. The bit of claim 6, wherein the coating of abrasion resistant material comprises a thickness of 0.5 to 4 mm.

13. The bit of claim 1, wherein the jack element comprises a distal end comprising a domed, rounded, semi-rounded, conical, flat, or pointed geometry.

14. The bit of claim 1, wherein a diameter of the shaft is 50 to 100% a diameter of the bore.

15. The bit of claim 1, wherein the drill bit comprises at least one electric motor.

16. The bit of claim 1, wherein the shaft is in mechanical communication with the at least one electric motor.

17. The bit of claim 1, where in the at least one electric motor is adapted to axially displace the shaft.

18. The bit of claim 10, wherein the at least one electric motor is powered by a turbine, a battery, or a power transmission system from the surface or down hole.

19. The bit of claim 10, wherein the at least one electric motor is in communication with a down hole telemetry system.

20. The bit of claim 10, wherein the at least one electric motor is an AC motor, a universal motor, a stepper motor, a three-phase AC induction motor, a three-phase AC synchronous motor, a two-phase AC servo motor, a single-phase AC induction motor, a single-phase AC synchronous motor, a torque motor, a permanent magnet motor, a DC motor, a brushless DC motor, a coreless DC motor, a linear motor, a doubly- or singly- fed motor, or combinations thereof.