Consistent Entry Hole Shaped Charge

Patent metadata

Field	Value
Publication number	US-2017199016-A1
Application number	US-201515313041-A
Country	US
Kind code	A1
Filing date	May 21, 2015
Priority date	May 21, 2014
Publication date	Jul 13, 2017
Grant date	—

Abstract

An apparatus and method for specialized shaped charges that perforate similar sized diameter holes regardless of the fluid gaps between the shaped charge and the casing wall.

First claim

What is claimed is:

1 . A shaped charge liner comprising:
an axis; a first section having a substantially conical shape, a first inner surface, a lowermost apex, and a first conical angle respective to the first inner surface; a second section having a substantially frusto-conical shape, a second inner surface, and a second conical angle respective to the second inner surface; a third section having a substantially frusto-conical shape, a third inner surface, a top surface perpendicular to the axis, and a third conical angle respective to the third inner surface; wherein the first section, second section and third section are axially aligned about the axis, the second conical angle is larger than the first conical angle and the second conical angle is larger than the third conical angle; a total height, wherein the total height is measured from the apex of the first section along the axis to a plane perpendicular to the top surface.

2 . The apparatus of claim 1 , wherein the first conical angle is larger than or equal to the third conical angle.

3 . The apparatus of claim 1 , wherein the first conical angle is between 44 and 52 degrees.

4 . The apparatus of claim 1 , wherein the second conical angle is between 56 and 58 degrees.

5 . The apparatus of claim 1 , wherein the third conical angle is between 44 and 54 degrees.

6 . The apparatus of claim 1 , having a first angle break where the first section and second section intersect and having a second angle break where the second section and the third section intersect.

7 . The apparatus of claim 6 , having a first height measured along the axis from the lowermost apex to a plane perpendicular to the first angle break and having a second height measured along the axis from the lowermost apex to a plane perpendicular to the second angle break.

8 . The apparatus of claim 7 , wherein the first height is between 26 and 34 percent of the total height.

9 . The apparatus of claim 7 , wherein the second height is between 70 and 73 percent of the total height.

10 . A method for perforating a formation comprising:
placing a perforating gun downhole at a predetermined location of a cased hole having an inner surface, placing a plurality of shaped charges in a plurality of orientations about the perforating gun; detonating a plurality of shaped charges in a plurality of directions, with a plurality of fluid gaps; and perforating consistent diameter holes in the case hole at a plurality of fluid gaps.

11 . The method of claim 10 , wherein the perforating gun is decentralized with respect to the cased hole at the predetermined location;

12 . The method of claim 10 , wherein consistent diameter holes is defined as each hole diameter having less than a 10 percent deviation from the average hole size of the plurality of the holes.

13 . The method of claim 10 , wherein the shaped charge comprises a case, explosive material, and a liner further comprising an axis, a first section having a substantially conical shape, a first inner surface, a lowermost apex, and a first conical angle respective to the first inner surface, a second section having a substantially frusta-conical shape, a second inner surface, and a second conical angle respective to the second inner surface, a third section having a substantially frusto-conical shape, a third inner surface, a top surface perpendicular to the axis, and a third conical angle respective to the third inner surface, the first section, second section and third section being axially aligned about the axis, the second conical angle being larger than the first conical angle, the second conical angle being larger than the third conical angle and the liner having a total height measured from the lowermost apex of the first section along the axis to a plane perpendicular to the top surface.

14 . The apparatus of claim 13 , wherein the first conical angle is between 44 and 52 degrees.

15 . The method of claim 13 , wherein the second conical angle is between 56 and 58 degrees.

16 . The method of claim 13 , wherein the third conical angle is between 44 and 54 degrees.

17 . The method of claim 13 , having a first angle break where the first section and second section intersect and having a second angle break where the second section and the third section intersect.

18 . The method of claim 13 , having a first height measured along the axis from the lowermost apex to a plane perpendicular to the first angle break and having a second height measured along the axis from the lowermost apex to a plane perpendicular to the second angle break.

19 . The method of claim 18 , wherein the first height is between 26 and 34 percent of the total height.

20 . The method of claim 19 , wherein the second height is between 70 and 73 percent of the total height.

21 . A shaped charge comprising:
a case; explosive material; a liner further comprising: an axis; a first section having a substantially conical shape, a first inner surface, a lowermost apex, and a first conical angle respective to the first inner surface; a second section having a substantially frusto-conical shape, a second inner surface, and a second conical angle respective to the second inner surface; a third section having a substantially frusto-conical shape, a third inner surface, a top surface perpendicular to the axis, and a third conical angle respective to the third inner surface; wherein the first section, second section and third section are axially aligned about the axis, the second conical angle is larger than the first conical angle and the second conical angle is larger than the third conical angle; a total height, wherein the total height is measured from the lowermost apex of the first section along the axis to a plane perpendicular to the top surface.

22 . The apparatus of claim 21 , wherein the first conical angle is larger than or equal to the third conical angle.

23 . The apparatus of claim 21 , wherein the first conical angle is between 44 and 52 degrees.

24 . The apparatus of claim 21 , wherein the second conical angle is between 56 and 58 degrees.

25 . The apparatus of claim 21 , wherein the third conical angle is between 44 and 54 degrees.

26 . The apparatus of claim 21 , having a first angle break where the first section and second section intersect, and having a second angle break where the second section and the third section intersect.

27 . The apparatus of claim 26 , having a first height measured along the axis from the lowermost apex to a plane perpendicular to the first angle break, and having a second height measured along the axis from the lowermost apex to a plane perpendicular to the second angle break.

28 . The apparatus of claim 27 , wherein the first height is between 26 and 34 percent of the total height.

29 . The apparatus of claim 28 , wherein the second height is between 70 and 73 percent of the total height.

Assignees

• Hunting Titan Inc

Inventors

• Collins William Richard
• Pederson Mark Allan

Classifications

• F42B1/028 Primary

  characterised by the form of the liner · CPC title

• E21B43/117 Primary

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