Pipe in pipe BHA electric drive motor

Patent metadata

Field	Value
Publication number	US-9752385-B2
Application number	US-201214371061-A
Country	US
Kind code	B2
Filing date	Jan 11, 2012
Priority date	Jan 11, 2012
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

Abstract

A pipe in pipe electric motor assembly comprising: a drilling string comprising an inner pipe and an outer pipe and an electric motor; wherein the electric motor is provided with power supplied by the inner pipe and the outer pipe acting at least as conductors and associated methods.

First claim

What is claimed is:

1. A pipe in pipe electric motor assembly comprising:
a drilling string comprising an inner pipe and an outer pipe, wherein the inner pipe and the outer pipe transmit a direct current power along the drilling string;
an electric motor controller electrically coupled to the inner pipe and the outer pipe, wherein the electric motor controller is positioned downhole, wherein the electric motor controller converts the direct current power to an alternating current;
an electric motor coupled to the electric motor controller, wherein the electric motor is provided with the alternating current of the at least one phase by the electric motor controller; and
wherein the electric motor controller alters any two phases of the alternating current to change the direction of rotation of a rotor of the electric motor.

2. The pipe in pipe electric motor assembly of claim 1 , wherein at least one of the inner pipe or the outer pipe is coated with an insulating material.

3. The pipe in pipe electric motor assembly of claim 2 , wherein the insulating material comprises a dielectric material.

4. The pipe in pipe electric motor assembly of claim 3 , wherein the dielectric material comprises at least one material selected from the group consisting of a polyimide, a high strength toughened fluoropolymer, nylon, teflon, and a ceramic coating.

5. The pipe in pipe electric motor assembly of claim 1 , further comprising a drive shaft.

6. The pipe in pipe electric motor assembly of claim 5 , wherein the drive shaft comprises a drive shaft magnet.

7. The pipe in pipe electric motor assembly of claim 1 , wherein the electric motor is coupled to a drill bit.

8. A method of providing power to an electric motor comprising:
providing a pipe in pipe electric motor assembly comprising:
a drilling string comprising an inner pipe and an outer pipe, wherein the inner pipe and the outer pipe transmit a direct current power along the drilling string;
an electric motor controller electrically coupled to the inner pipe and the outer pipe, wherein the electric motor controller is positioned downhole, wherein the electric motor controller converts the direct current power to an alternating current, and
an electric motor coupled to the electric motor controller; and

providing the alternating current of the at least one phase to the electric motor by the electric motor controller, wherein the electric motor controller alters any two phases of the alternating current to change the direction of rotation of a rotor of the electric motor.

9. The method of claim 8 , wherein at least one of the inner pipe or the outer pipe is coated with an insulating material.

10. The method of claim 9 , wherein the insulating material comprises a dielectric material.

11. The method of claim 10 , wherein the dielectric material comprises at least one material selected from the group consisting of a polyimide, a high strength toughened fluoropolymer, nylon, teflon, and a ceramic coating.

12. The method of claim 8 , wherein the pipe in pipe electric motor assembly further comprises a drive shaft.

13. The method of claim 12 , wherein the drive shaft comprises a drive shaft magnet.

14. The method of claim 8 , wherein the electric motor is coupled to a drill bit.

15. A method of drilling a wellbore in a subterranean formation comprising:
providing a pipe in pipe electric motor assembly comprising:
a drilling string comprising an inner pipe and an outer pipe, wherein the inner pipe and the outer pipe transmit a direct current power along the drilling string;
an electric motor controller electrically coupled to the inner pipe and the outer pipe, wherein the electric motor controller is positioned downhole, wherein the electric motor controller converts the direct current power to an alternating current;
an electric motor coupled to the electric motor controller; and
a drill bit, wherein the electric motor is provided with the alternating current by the electric motor controller;

providing the alternating current of the at least one phase to the electric motor to generate rotational power, wherein the electric motor controller alters any two phases of the alternating current to change the direction of rotation of a rotor of the electric motor; and
applying the rotational power to the drill bit.

16. The method of claim 15 , wherein at least one of the inner pipe or the outer pipe is coated with an insulating material.

17. The method of claim 16 , wherein the insulating material comprises a dielectric material.

18. The method of claim 17 , wherein the dielectric material comprises at least one material selected from the group consisting of a polyimide, a high strength toughened fluoropolymer, nylon, teflon, and a ceramic coating.

19. The method of claim 15 , wherein the pipe in pipe electric motor assembly further comprises a drive shaft.

20. The method of claim 19 , wherein the drive shaft comprises a drive shaft magnet.

Assignees

• Hay Richard Thomas
• Holtzman Keith E
• Halliburton Energy Services Inc

Inventors

• Hay Richard Thomas
• Holtzman Keith E

Classifications

• E21B4/04 Primary

  Electric drives (E21B4/12 takes precedence) · CPC title

• E21B17/028

  Electrical or electro-magnetic connections · CPC title

• E21B17/003 Primary

  with electrically conducting or insulating means (E21B17/028 and E21B17/023 take precedence) · CPC title

• E21B17/0285

  characterised by electrically insulating elements · CPC title