Additive manufacturing of energetic materials in oil well shaped charges

Patent metadata

Field	Value
Publication number	US-2021223006-A1
Application number	US-201816314367-A
Country	US
Kind code	A1
Filing date	Jan 5, 2018
Priority date	Jan 5, 2018
Publication date	Jul 22, 2021
Grant date	—

Abstract

A shaped charge for use in a well perforating tool includes at least one explosive component fabricated by an additive manufacturing process such as three-dimensional printing. The additive manufacturing process may facilitate the production of complex geometries including voids and/or density gradients in the explosive materials that, when detonated, produce a specific penetration effect in a wellbore. The explosive materials may be deposited individually as a pellet, or may be deposited on one or both of a case and a liner acting as a scaffold during the additive manufacturing process.

First claim

What is claimed is:

1 . A shaped charge operable for forming a perforation in a wellbore, the shaped charge comprising:
a case; at least one explosive disposed within the case, wherein the at least one explosive is formed by an additive manufacturing process; and a liner coupled to the case and substantially enclosing the at least one explosive within the case.

2 . The shaped charge according to claim 1 , wherein the at least one explosive includes an interior void defined therein.

3 . The shaped charge according to claim 2 , wherein the interior void comprises at least one of the group consisting of a toroid-shape, an oblong cross section, a polygonal cross section and an irregular cross section.

4 . The shaped charge according to claim 3 , wherein the interior void includes at least one of the group consisting of atmospheric gasses, liquids, and non-explosive materials disposed therein.

5 . The shaped charge according to claim 2 , wherein the interior void is defined in a booster explosive formed at an ignition end of the shaped charge.

6 . The shaped charge according to claim 1 , wherein the at least one explosive comprises a plurality of distinct material layers defining a density gradient within the case of the shaped charge.

7 . The shaped charge according to claim 6 , wherein a first of the plurality of distinct material layers is disposed adjacent the liner and a second of the plurality of distinct material layers is disposed adjacent the case.

8 . A method of fabricating a shaped charge to produce perforation in a wellbore, the method comprising:
providing a charge and a liner; depositing at least one explosive material by an additive manufacturing process; and coupling the liner coupled to the case to substantially enclose the at least one explosive within the case.

9 . The method according to claim 8 , wherein the at least one explosive material is deposited directly onto at least one of the liner and the case in the additive manufacturing process.

10 . The method according to claim 8 , wherein the at least one explosive material is deposited as a pellet separate from the liner and the case in the additive manufacturing process.

11 . The method according to claim 8 , further comprising forming at least one void in the at least one explosive material in the additive manufacturing process.

12 . The method according to claim 11 , further comprising pausing the additive manufacturing process when the at least one void is open, filling the at least one void with a material distinct from the at least one explosive material, and resuming the additive manufacturing process to enclose the material distinct from the at last one explosive material within the at least one void.

13 . The method according to claim 8 , further comprising forming a density gradient in the at least one explosive material by the additive manufacturing process.

14 . The method according to claim 13 , further comprising forming distinct material layers in the at least one explosive to define the density gradient.

15 . The method according to claim 14 , further comprising forming the distinct material layers normal to an axis of the shaped charge.

16 . The method according to claim 14 , further comprising depositing a first one of the distinct material layers onto the liner and a second one of the distinct material layers onto the case by the additive manufacturing process.

17 . The method according to claim 8 , wherein the additive manufacturing process is a three-dimensional printing process.

18 . A perforating tool system for forming a perforation in a wellbore, the perforating tool comprising:
a carrier body constructed of a cylindrical sleeve; a plurality of shaped charges disposed within the carrier body, each of the shaped charges having a case, a liner and at least one explosive formed by an additive manufacturing process and substantially enclosed by the case and the liner.

19 . The perforating tool system according to claim 18 , further comprising a detonator cord extending through the carrier body and coupled to each of the shaped charges, wherein at least a portion of the detonator cord is constructed by an additive manufacturing process.

20 . The perforating tool system according to claim 18 , further comprising a conveyance coupled to the carrier body, the conveyance operable to lower the carrier body into a wellbore.

Assignees

• Halliburton Energy Services Inc

Inventors

• Metzger Jason P
• Craddock Jr Gerald G
• Harrington Nicholas G

Classifications

• E21B43/119

  Details, e.g. for locating perforating place or direction · CPC title

• E21B43/117 Primary

  Shaped-charge perforators (E21B43/118 takes precedence) · CPC title

• F42B1/036 Primary

  Manufacturing processes therefor {(F42B33/0214 - F42B33/0292 take precedence)} · CPC title