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Downhole electrical power system

Imported: 24 Feb '17 | Published: 06 Jan '04

Roger L. Schultz, Brock Watson, Michael L. Fripp, Juanita M. Cassidy

USPTO - Utility Patents

Abstract

A downhole electrical power system provides long term electrical power in a downhole environment. In a described embodiment, a downhole electrical power system includes a power source which supplies electrical power to a well tool interconnected in a tubular string. The power source includes a voltaic cell.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view of a downhole electrical power system embodying principles of the present invention; and

FIG. 2 is a schematic cross-sectional view of an electrical power source of the power system of FIG.

1.

Claims

1. A downhole electrical power system, comprising:

2. A downhole electrical power system, comprising:

3. A downhole electrical power system, comprising:

4. A downhole electrical power system, comprising:

5. A downhole electrical power system, comprising:

6. The power system according to claim 5, wherein the gas-permeable barrier is permeable to hydrogen gas.

7. The power system according to claim 5, wherein the gas-permeable barrier is a floating piston.

8. A downhole electrical power system, comprising:

9. A downhole electrical power system, comprising:

10. The power system according to claim 9, wherein an electrically insulating barrier isolates the electrolyte from the insulating fluid, while transmitting pressure between the insulating fluid and the electrolyte.

11. The power system according to claim 10, wherein the insulating barrier is permeable to hydrogen gas generated in the voltaic cell.

12. A downhole electrical power system, comprising:

13. The power system according to claim 12, wherein the voltaic cell is isolated from well fluid by a first barrier which permits pressure transfer between the well fluid and the voltaic cell.

14. The power system according to claim 13, further comprising an insulating fluid disposed between the well fluid and the voltaic cell.

15. The power system according to claim 14, wherein the first barrier isolates the well fluid from the insulating fluid, and a second barrier isolates the insulating fluid from an electrolyte of the voltaic cell.

16. The power system according to claim 15, wherein the second barrier is electrically insulative.

17. The power system according to claim 15, wherein the second barrier permits pressure transfer between the insulating fluid and the electrolyte.

18. The power system according to claim 17, wherein the second barrier is permeable to hydrogen generated in the voltaic cell.

19. The power system according to claim 12, wherein there are multiple ones of the voltaic cells, the voltaic cells being electrically connected to each other.

20. The power system according to claim 19, wherein the voltaic cells are connected in series.

21. The power system according to claim 19, wherein a first one of the voltaic cells is positioned within a second one of the voltaic cells.

22. The power system according to claim 21, wherein the second voltaic cell is annular-shaped and surrounds the first voltaic cell.

23. The power system according to claim 22, wherein the first voltaic cell is annular-shaped and surrounds the flow passage.