SINTERED TUNGSTEN LINERS FOR SHAPED CHARGES

• US 20030037693A1
• Filed: 05/17/2001
• Published: 02/27/2003
• Est. Priority Date: 05/20/2000
• Status: Active Grant

• Current Assignee: Baker Hughes Incorporated (Baker Hughes Company)
• Original Assignee: Baker Hughes Incorporated (Baker Hughes Company)
• Inventors: Loehr, John D., Wendt, Clarence W. Jr., Betancourt, David, Reese, James W.
• Granted Patent: US 6,530,326 B1
• Time in Patent Office: Days
• US Class Current: 102/306
• CPC Class Codes: F42B 1/032 characterised by the material of the liner

Abstract

A method of producing a liner for a shaped charge comprising mixing a composition of powdered metal with plasticizers and binders to form a paste. The paste is then particulated and injected into an injection mold. The paste is molded into a molded liner shape and then chemically treated to remove plasticizers and binders from the molded liner shape. After being removed from the injection mold the molded liner shape is sintered inside of a furnace. The powdered metal composition can be comprised of a mixture of from 60% to 97% by weight of powdered heavy metal and from 40% to 3% by weight of cobalt, or the powdered metal composition can be comprised of a mixture of from 60% to 97% by weight of powdered heavy metal and from 40% to 3% of copper, the preferred heavy metal being tungsten.

Claims

1. A liner for a shaped charge for perforating well formations comprising:

a mixture of powdered heavy metal and powdered metal binder said liner formed into a liner shape by injection molding and sintering.

2. The liner for a shaped charge of claim 1, wherein said powdered heavy metal is comprised of tungsten, and said powdered metal binder is comprised of cobalt.

3. The liner for a shaped charge of claim 1, wherein said powdered heavy metal is comprised of tungsten, and said powdered metal binder is comprised of copper.

4. The liner for a shaped charge of claim 2, wherein said tungsten comprises from 60% to 97% by weight of said mixture and wherein said cobalt comprises from 40% to 3% by weight of said mixture.

5. The liner for a shaped charge of claim 3, wherein said tungsten comprises from 60% to 97% by weight of said mixture and wherein said copper comprises from 40% to 3% by weight of said mixture.

6. The liner for a shaped charge of claim 2, wherein said tungsten comprises from 90% to 94% by weight of said mixture and wherein said cobalt comprises from 10% to 6% by weight of said mixture.

7. The liner for a shaped charge of claim 3, wherein said tungsten comprises 85% by weight of said mixture and wherein said copper comprises 15% by weight of said mixture.

8. The liner for a shaped charge of claim 1, wherein said liner shape is chosen from the group consisting of conical, bi-conical, tulip, hemispherical, circumferential, linear, and trumpet.

9. A shaped charge comprising:

a housing;

a quantity of explosive inserted into said housing; and

a liner inserted into said housing so that said quantity of explosive is positioned between said liner and said housing, said liner formed into a liner shape by injection molding and sintering said mixture.

10. The liner for a shaped charge of claim 9, wherein said powdered heavy metal is comprised of tungsten, and said powdered metal binder is comprised of cobalt.

11. The liner for a shaped charge of claim 9, wherein said powdered heavy metal is comprised of tungsten, and said powdered metal binder is comprised of copper.

12. The liner for a shaped charge of claim 10, wherein said tungsten comprises from 60% to 97% by weight of said mixture and wherein said cobalt comprises from 40% to 3% by weight of said mixture.

13. The liner for a shaped charge of claim 11, wherein said tungsten comprises from 60% to 97% by weight of said mixture and wherein said copper comprises from 40% to 3% by weight of said mixture.

14. The liner for a shaped charge of claim 10, wherein said tungsten comprises from 90% to 94% by weight of said mixture and wherein said cobalt comprises from 10% to 6% by weight of said mixture.

15. The liner for a shaped charge of claim 11, wherein said tungsten comprises 85% by weight of said mixture and wherein said copper comprises 15% by weight of said mixture.

16. The liner for a shaped charge of claim 9, wherein said liner shape is chosen from the group consisting of conical, bi-conical, tulip, hemispherical, circumferential, linear, and trumpet.

17. A method of producing a liner for a shaped charge comprising the steps of:

mixing a composition of powdered metal with plasticizers and binders to form a paste;

particulating said paste;

injecting said particulated paste into an injection mold;

molding said particulated paste into a molded liner shape;

removing plasticizers and binders from said molded liner shape;

sintering said molded liner shape to produce a shaped charge liner.

18. The method of claim 17, wherein said powdered metal comprises tungsten and said binder comprises cobalt.

19. The method of claim 17, wherein said powdered metal comprises tungsten and said binder comprises copper.

20. The method of claim 18, wherein said composition comprises from 60% to 97% by weight of tungsten and 40% to 3% by weight of cobalt.

21. The method of claim 19, wherein said composition comprises from 60% to 97% by weight of tungsten and 40% to 3% by weight of copper.

22. The method of claim 18, wherein said composition comprises from 90% to 94% by weight of tungsten and 10% to 6% by weight of cobalt.

23. The method of claim 19, wherein said composition comprises 85% by weight of tungsten, and 15% by weight of copper.

24. The method of claim 17, wherein said liner shape is chosen from the group consisting of conical, bi-conical, tulip, hemispherical, circumferential, linear, and trumpet.