Multiple point initiation for non-axisymmetric shaped charge

Patent metadata

Field	Value
Publication number	US-2018202779-A1
Application number	US-201615743718-A
Country	US
Kind code	A1
Filing date	Aug 12, 2016
Priority date	Aug 18, 2015
Publication date	Jul 19, 2018
Grant date	—

Abstract

A non-axisymmetric shaped charge including a casing, such as a non-axisymmetric shaped casing, and a liner housed therein, is generally described in which the casing includes multiple initiation points extending in a planar arrangement along an external surface of the casing. The non-axisymmetric shaped charge may include a plurality of guiding members positioned on the external surface. The non-axisymmetric shaped charge is capable of creating sufficient ballistic energy to uniformly collapse the liner.

First claim

1 . A non-axisymmetric shaped charge comprising:
a non-axisymmetric shaped casing having a hollow interior; a liner housed within the non-axisymmetric shaped casing; an explosive load disposed within the hollow interior; and multiple initiation points extending in a planar arrangement along an external surface of the non-axisymmetric shaped casing.

2 . The non-axisymmetric shaped charge of claim 1 , wherein the non-axisymmetric shaped casing is further defined by a front portion, a plurality of side wall portions and a back wall portion, wherein the front portion is open.

3 . The non-axisymmetric shaped charge of claim 2 , wherein the explosive load is enclosed, encased or positioned between the liner and the back wall portion.

4 . The non-axisymmetric shaped charge of claim 2 wherein the liner has a V-shaped cross-section that extends along at least a portion of a length of the back wall portion between two opposing side wall portions of the plurality of side wall portions.

5 . The non-axisymmetric shaped charge of claim 1 , wherein the multiple initiation points are arranged in a substantially linear configuration with respect to each other.

6 . The non-axisymmetric shaped charge of claim 1 , wherein the multiple initiation points comprises three or more initiation points.

7 . The non-axisymmetric shaped charge of claim 1 , further comprising a plurality of guiding members positioned on the external surface.

8 . The non-axisymmetric shaped charge of claim 7 , wherein the plurality of guiding members are spaced apart from each other.

9 . The non-axisymmetric shaped charge of claim 7 , wherein the plurality of guiding members are spaced apart from each other providing a gap configured for aligning a detonating cord along the external surface of the non-axisymmetric shaped casing.

10 . The non-axisymmetric shaped charge of claim 7 , wherein the plurality of guiding members are arranged in a slanted direction to position a detonating cord in a substantially helical pattern.

11 . A perforating gun comprising:
a shaped charge carrier tube having openings; and a plurality of non-axisymmetric shaped charges, wherein each of the plurality of shaped charges are positioned within each of the openings, further wherein each of the plurality of non-axisymmetric shaped charges comprises:
a non-axisymmetric shaped casing having a hollow interior;
a liner housed within the non-axisymmetric shaped casing;
an explosive load disposed within the hollow interior; and
multiple initiation points extending in a planar arrangement along an external surface of the non-axisymmetric shaped casing.

12 . The perforating gun of claim 11 , wherein each of the plurality of non-axisymmetric shaped charges further comprise a plurality of guiding members positioned on the external surface.

13 . The perforating gun of claim 11 , wherein the non-axisymmetric shaped casing is further defined by a front portion, a plurality of side wall portions and a back wall portion, wherein the front portion is open.

14 . The perforating gun of claim 11 , wherein the plurality of non-axisymmetric shaped charges are positioned in the shaped charge carrier tube in an outwardly facing helical arrangement.

15 . The perforating gun of claim 11 , wherein at least a pair of the plurality of non-axisymmetric shaped charges are positioned in the shaped charge carrier tube in an abutting external surface to external surface arrangement.

16 . The perforating gun of claim 12 , further comprising a detonating cord, wherein the detonating cord is arranged exteriorly to the shaped charge carrier tube.

17 . The perforating gun of claim 12 , further comprising a detonating cord, wherein the detonating cord is arranged within a bore of the shaped charge carrier tube and positioned within a gap disposed between the plurality of guiding members.

18 . The perforating gun of claim 15 , further comprising a detonating cord arranged within a bore of the shaped charge carrier tube and positioned between the abutting external surfaces of each of the pairs of the plurality of non-axisymmetric shaped charges.

19 . A method of forming a non-axisymmetric shaped charge comprising:
forming a non-axisymmetric shaped casing having a hollow interior defined by a front portion, a plurality of side wall portions, and a back wall portion, wherein the front portion is open; forming multiple initiation points in the back wall portion of the non-axisymmetric shaped casing, the multiple initiation points extending in a planar arrangement along an external surface of the back wall portion; delivering an explosive load into the hollow interior of the non-axisymmetric shaped casing; and restraining the explosive load within the hollow interior by positioning a liner within the open front portion of the non-axisymmetric shaped casing.

20 . The method of claim 19 , further comprising forming and positioning a plurality of guiding members on the external surface of the back wall portion of the non-axisymmetric shaped casing.

Assignees

• Dynaenergetics Gmbh & Co Kg

Inventors

• Mcnelis Liam
• Shahinpour Arash
• Mueller Joerg

Classifications

• F42B1/028 Primary

  characterised by the form of the liner · CPC title

• F42B3/26

  Arrangements for mounting initiators; Accessories therefor, e.g. tools · CPC title

• F42B1/036

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

• E21B43/117

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

• F42B3/08

  with cavities in the charge, e.g. hollow-charge blasting cartridges · CPC title