Shaped Charge Having A Radial Momentum Balanced Liner

Patent metadata

Field	Value
Publication number	US-2017052004-A1
Application number	US-201415119618-A
Country	US
Kind code	A1
Filing date	Apr 18, 2014
Priority date	Apr 18, 2014
Publication date	Feb 23, 2017
Grant date	—

Abstract

A disclosed example embodiment includes a shaped charge for use in a well perforating system. The shaped charge includes a housing having a discharge end and an initiation end. A liner is positioned with the housing. A main explosive is positioned within the housing between the liner and the initiation end of the housing. The liner has a radially outwardly disposed concave section having a progressively decreasing wall thickness in the direction from the initiation end to the discharge end of the housing and a radially inwardly disposed convex section having a progressively increasing wall thickness in the direction from the initiation end to the discharge end of the housing such that the liner is radial momentum balanced and operable to form a coherent jet having a hollow leading edge following detonation of the shaped charge.

First claim

What is claimed is:

1 . A shaped charge comprising:
a housing having a discharge end and an initiation end; a liner positioned with the housing, wherein, the liner has a radially outwardly disposed concave section having a progressively decreasing wall thickness in the direction from the initiation end to the discharge end and a radially inwardly disposed convex section having a progressively increasing wall thickness in the direction from the initiation end to the discharge end; and a main explosive positioned within the housing between the liner and the initiation end of the housing,

2 . The shaped charge as recited in claim 1 further comprising a point source initiator operably associated with the main explosive configured to generate a single point detonation wave in the shaped charge.

3 . The shaped charge as recited in claim 1 further comprising an annular source initiator operably associated with the main explosive configured to generate an annular detonation wave in the shaped charge.

4 . The shaped charge as recited in claim 1 wherein the wall thickness of the radially outwardly disposed concave section of the liner decreases linearly in the direction from the initiation end to the discharge end of the housing.

5 . The shaped charge as recited in claim 1 wherein the wall thickness of the radially outwardly disposed concave section of the liner decreases nonlinearly in the direction from the initiation end to the discharge end of the housing.

6 . The shaped charge as recited in claim 1 wherein the wall thickness of the radially inwardly disposed convex section of the liner increases linearly in the direction from the initiation end to the discharge end of the housing.

7 . The shaped charge as recited in claim 1 wherein the wall thickness of the radially inwardly disposed convex section of the liner increases nonlinearly in the direction from the initiation end to the discharge end of the housing.

8 . The shaped charge as recited in claim 1 wherein the radially outwardly disposed concave section of the liner and the radially inwardly disposed convex section of the liner are radial momentum balanced to form a coherent jet having a hollow leading edge following detonation of the shaped charge.

9 . The shaped charge as recited in claim 1 wherein the radially outwardly disposed concave section of the liner and the radially inwardly disposed convex section of the liner are radial momentum balanced to form a coherent jet having a hollow generally cylindrical shape following detonation of the shaped charge.

10 . A liner for a shaped charge having a housing with a discharge end and an initiation end and a main explosive positioned within the housing between the liner and the initiation end of the housing, the liner comprising:
a radially outwardly disposed concave section having a progressively decreasing wall thickness in the direction from the initiation end to the discharge end of the housing; and a radially inwardly disposed convex section having a progressively increasing wall thickness in the direction from the initiation end to the discharge end of the housing.

11 . The liner as recited in claim 10 wherein the wall thickness of the radially outwardly disposed concave section decreases linearly in the direction from the initiation end to the discharge end of the housing.

12 . The liner as recited in claim 10 wherein the wall thickness of the radially outwardly disposed concave section decreases nonlinearly in the direction from the initiation end to the discharge end of the housing.

13 . The liner as recited in claim 10 wherein the wall thickness of the radially inwardly disposed convex section increases linearly in the direction from the initiation end to the discharge end of the housing.

14 . The liner as recited in claim 10 wherein the wall thickness of the radially inwardly disposed convex section increases nonlinearly in the direction from the initiation end to the discharge end of the housing.

15 . The liner as recited in claim 10 wherein the radially outwardly disposed concave section and the radially inwardly disposed convex section are radial momentum balanced to form a coherent jet having a hollow leading edge following detonation of the shaped charge.

16 . The liner as recited in claim 10 wherein the radially outwardly disposed concave section and the radially inwardly disposed convex section are radial momentum balanced to form a coherent jet having a hollow generally cylindrical shape following detonation of the shaped charge.

17 . A method of perforating a wellbore casing comprising:
detonating at least one shaped charge positioned within the wellbore casing, the at least one shaped charge including a housing having a discharge end and an initiation end, a liner positioned with the housing and a main explosive positioned within the housing between the liner and the initiation end of the housing, the liner having a radially outwardly disposed concave section having a progressively decreasing wall thickness in the direction from the initiation end to the discharge end of the housing and a radially inwardly disposed convex section having a progressively increasing wall thickness in the direction from the initiation end to the discharge end of the housing; and forming a coherent jet having a hollow leading edge.

18 . The method as recited in claim 17 wherein detonating the at least one shaped charge further comprises generating a single point detonation wave in the shaped charge.

19 . The method as recited in claim 17 wherein detonating the at least one shaped charge further comprises generating an annular detonation wave in the shaped charge.

20 . The method as recited in claim 17 wherein forming a coherent jet having a hollow leading edge further comprises forming a coherent jet having a hollow generally cylindrical shape.

Assignees

• Halliburton Energy Services Inc

Inventors

• Xue Zhenyu

Classifications

• F42B1/028 Primary

  characterised by the form of the liner · CPC title

• E21B43/117

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