Fluted linear shaped charge with simultaneous initiation

• US 10,458,761 B2
• Filed: 03/02/2018
• Issued: 10/29/2019
• Est. Priority Date: 03/02/2017
• Status: Active Grant

• Current Assignee: Nicholas Collier
• Original Assignee: Nicholas Collier
• Inventors: Collier, Nicholas
• Primary Examiner(s): Bagnell, David J
• Assistant Examiner(s): Runyan, Ronald R
• Application Number:
  US15/910,885
• Publication Number:
  US 20180252507A1
• Time in Patent Office: 606 Days
• Field of Search: 149 2, 1491094
• CPC Class Codes: E21B 29/02 by explosives or by thermal or chemical means freeing stuck objects by explosives E21B31/002
• CPC Class Codes: E21B 43/117 Shaped-charge perforators E21B43/118 takes precedence
• CPC Class Codes: F42B 1/028 characterised by the form of the liner
• CPC Class Codes: F42B 3/26 Arrangements for mounting initiators; Accessories therefor, e.g. tools
• CPC Class Codes: F42C 19/0807 characterised by the particular configuration of the transmission channels from the priming energy source to the charge to be ignited, e.g. multiple channels, nozzles, diaphragms or filters
• CPC Class Codes: F42C 19/0846 Arrangements of a multiplicity of primers or detonators, dispersed within a warhead, for increased efficiency

Abstract

This patent relates to lined shaped explosive devices, in particular it relates to linear Shaped Charges (SC), more particularly it relates to a Fluted or Scalloped Linear Shaped Charge. The fluted linear SC, unlike a standard linear SC produces hydrodynamic penetration, higher jet velocities, higher mass jets and deeper penetration. The fluted linear device disclosed herein produces greater compression and convergence of the liner material because of the partial radial collapse of the concave flutes. Further, the fluted linear SC is equipped with a simultaneous initiation of the full length of the explosive driving the liner, providing smooth detonation wave front along the full length of the fluted linear liner.

Claims

1. A fluted linear shaped charge device, the fluted linear shaped charge device comprising:

a containment body, wherein

the containment body includes;

a closed end;

one or more initiation ports, wherein the one or more initiation ports each include an aperture through the closed end of the containment body;

one or more curved surfaces adjacent the closed end; and

an open end opposite the closed end;

the closed end and the one or more curved surfaces create an enclosure;

one or more initiators, wherein each initiator passes through one of the one or more initiation ports from the exterior of the enclosure to the interior of the enclosure;

a simultaneous initiation plate on the exterior of the enclosure, the simultaneous initiation plate;

configured to ensure that each initiator detonates simultaneously; and

including a very low sound speed material

a fluted liner, wherein the fluted liner includes;

one or more flutes, wherein;

a portion of the one or more flutes;

match the curvature of the one or more curved surfaces in the containment body at the open end; and

are in contact with the containment body at the open end; and

a high explosive billet, wherein the high explosive billet;

is in contact with a portion of the initiator; and

is placed between the closed end of the containment body and the fluted liner.

2. The fluted linear shaped charge device of claim 1 wherein at least one component is frangible.

3. The fluted linear shaped charge device of claim 1 wherein at least one component is powdered metal.

4. The fluted linear shaped charge device of claim 1 further comprising:

a first end plate on a first side of the container body; and

a second end plate on a second side of the container body, wherein the second end plate is opposite the first side.

5. The fluted linear shaped charge device of claim 1 wherein each flute in the fluted liner includes frusto conical liner flutes.

6. The fluted linear shaped charge device of claim 1 wherein each flute in the fluted liner includes a parabolic apex.

7. The fluted linear shaped charge device of claim 1 wherein the fluted liner includes a liner wall.

8. The fluted linear shaped charge device of claim 7 wherein the liner wall is tapered.

9. A system for removal of at least a portion of an oil well casing, the removed casing being disposed of within the oil well, the system comprising:

a casing cutter, the casing cutter configured to cut an oil well casing to a desired length; and

a fluted linear shaped charge device, wherein the fluted linear shaped charge device includes;

a containment body, wherein

the containment body includes;

a closed end;

one or more initiation ports, wherein the one or more initiation ports each include an aperture through the closed end of the containment body;

one or more curved surfaces adjacent the closed end; and

an open end opposite the closed end;

the closed end and the one or more curved surfaces create an enclosure;

one or more dual line initiation cups, wherein each dual line initiation cup;

passes through one of the one or more initiation ports from the exterior of the enclosure to the interior of the enclosure; and

includes;

a first branch; and

a second branch;

a simultaneous initiation plate on the exterior of the enclosure, the simultaneous initiation plate;

configured to ensure that each dual line initiation cup detonates simultaneously; and

including a very low sound speed material;

a shock attenuator, wherein the shock attenuator includes a low sound speed material placed between the first branch and the second branch of each dual line initiation cup;

a fluted liner, wherein the fluted liner includes;

one or more flutes, wherein;

a portion of the one or more flutes;

match the curvature of the one or more curved surfaces in the containment body at the open end; and

are in contact with the containment body at the open end; and

a high explosive billet, wherein the high explosive billet;

is in contact with a portion of the first branch and the second branch of each dual line initiation cup; and

is placed between the shock attenuator and the fluted liner.

10. The system of claim 9 wherein the initiation plate includes explosive filled channels.

11. The system of claim 10, wherein the explosive filled channels are equal length.

12. A method for removing of at least a portion of an oil well casing, the removed casing being disposed of within the oil well, the method comprising:

cutting an oil well casing at a first location to a desired length and arc length using a casing cutter;

cutting the oil well casing at second location to a desired length and arc length using the casing cutter;

placing a fluted linear shaped charge device between the first location and the second location, wherein the fluted linear shaped charge device includes;

a containment body, wherein

the containment body includes;

a closed end;

one or more initiation ports, wherein the one or more initiation ports each include an aperture through the closed end of the containment body;

one or more curved surfaces adjacent the closed end; and

an open end opposite the closed end;

the closed end and the one or more curved surfaces create an enclosure;

one or more dual line initiation cups, wherein each dual line initiation cup;

passes through one of the one or more initiation ports from the exterior of the enclosure to the interior of the enclosure; and

includes;

a first branch; and

a second branch;

a simultaneous initiation plate on the exterior of the enclosure, the simultaneous initiation plate;

configured to ensure that each dual line initiation cup detonates simultaneously; and

including a very low sound speed material;

a shock attenuator, wherein the shock attenuator includes a low sound speed material placed between the first branch and the second branch of each dual line initiation cup;

a fluted liner, wherein the fluted liner includes;

one or more flutes, wherein;

a portion of the one or more flutes;

includes a frusto conical shape;

match the curvature of the one or more curved surfaces in the containment body at the open end; and

are in contact with the containment body at the open end;

each flute includes a liner; and

a high explosive billet, wherein the high explosive billet;

is in contact with a portion of the first branch and the second branch of each dual line initiation cup; and

is placed between the shock attenuator and the fluted liner; and

initiating the detonation of the fluted linear shaped charge device.

13. The method of claim 12 wherein an angle of the frusto conical portion of each flute is between 36 degrees and 150 degrees.

14. The method of claim 12 wherein the thickness of the liner wall is between 0.03 inches and 0.065 inches.