IP Library › Granted Patent US 12,398,627
Granted Patent B1
US 12,398,627 · App. 19/017,226 · Granted Aug 26, 2025

Downhole perforating gun tube and components

Inventors: Dawna Mauldin (Pampa, TX); Sidney W. Mauldin (Pampa, TX)
Assignee: SWM International, LLC
E21B43/117E21B43/1185E21B43/119F42D1/045
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Quick Facts
Patent No.
US 12,398,627
App. No.
19/017,226
Granted
Aug 26, 2025
Kind
B1
Abstract

A gun tube for a downhole perforating gun assembly includes a body having a cavity and one or more weights in the cavity. Gravity acts on the weights, which causes the tube body to rotate around its longitudinal axis so the weights are adjacent the lower part of the wellbore in which the gun assembly is positioned when oriented horizontally. This position shape charges in the gun tube in a desired position prior to the shape charges being fired. The gun tube may also include one or more end connectors with electrical contacts having a first, extended position, and a second, contracted position, and/or end connectors that can be assembled by hand without the use of tools.

Claims (47)

1. A downhole perforating gun system, comprising:

an outer body configured to connect to the downhole perforating gun system;

an inner body disposed inside the outer body and having at least one explosive charge receptacle, the inner body having a longitudinal axis and having a center of gravity offset from the longitudinal axis of the inner body;

a first rotational assembly comprising a first structure and a second structure, the first and second structures being rotatable relative to one another, the first structure engaged with at least a portion the inner body, the second structure engaged with at least a portion of the outer body, the first rotational assembly rotatably supporting the inner body relative to the outer body and being configured to permit radial orientation of the inner body about the longitudinal axis relative to the outer body based on the center of gravity of the inner body; and

a first electrical conductor at least partially disposed through the first rotational assembly and being configured to conduct electricity with the downhole perforating gun system.

2. The downhole perforating gun system of claim 1 , wherein the first structure of the first rotational assembly comprises a first housing member of a bearing housing; wherein the second structure of the first rotational assembly comprises a second housing member of the bearing housing; and wherein the first rotational assembly comprises one or more bearings disposed between the first and second housing members of the bearing housing.

3. The downhole perforating gun system of claim 1 , wherein the first electrical conductor comprises a first electrical contact being associated with the inner body and being biased between an extended position and a contracted position.

4. The downhole perforating gun system of claim 1 , wherein the outer body comprises:

an outer casing having first and second ends and defining an interior therein, the inner body disposed inside the interior of the outer casing; and

a first sub-assembly configured to connect to the first end of the outer casing,

wherein the second structure of the first rotational assembly is engaged with at least a portion of the first sub-assembly.

5. The downhole perforating gun system of claim 1 , wherein the outer body comprises:

an outer casing having first and second ends and defining an interior therein, the inner body disposed inside the interior of the outer casing; and

a first sub-assembly configured to connect to the first end of the outer casing,

wherein the second structure of the first rotational assembly is engaged with at least a portion of the outer casing.

6. The downhole perforating gun system of claim 5 , wherein the second structure of the first rotational assembly is further engaged with at least a portion of the first sub-assembly.

7. The downhole perforating gun system of claim 1 , wherein the first electrical conductor comprises a first electrical contact associated with the inner body; and wherein the outer body comprises:

an outer casing having first and second ends and defining an interior therein, the inner body disposed inside the interior of the outer casing; and

a first sub-assembly configured to connect to the first end of the outer casing, the first sub-assembly having a second electrical contact of the first electrical conductor, the second electrical contact being configured to electrically contact the first electrical contact.

8. The downhole perforating gun system of claim 7 , wherein at least a portion of the first electrical contact is biased relative to the second electrical contact.

9. The downhole perforating gun system of claim 7 , wherein at least a portion of the second electrical contact is biased relative to the first electrical contact.

10. The downhole perforating gun system of claim 1 , wherein the inner body comprises one or more weight elements disposed on the inner body and providing the inner body with the center of gravity offset from the longitudinal axis of the inner body.

11. The downhole perforating gun system of claim 10 , wherein the one or more weight elements are disposed at one or more predefined locations on the inner body and are retained by one or more tabs to the inner body.

12. The downhole perforating gun system of claim 1 , wherein the first rotational assembly rotatably supports a first end of the inner body; and the downhole perforating gun system further comprises:

a second rotational assembly rotatably supporting a second end of the inner body relative to the outer body; and

a second electrical conductor at least partially disposed through the second rotational assembly and being configured to conduct electricity with the downhole perforating gun system.

13. A downhole perforating gun system, comprising:

an outer body comprising an outer casing and a first sub-assembly, the outer casing having first and second ends and defining an interior therein, the first sub-assembly being configured to connect the first end of the outer casing to the downhole perforating gun system;

an inner body disposed in the interior of the outer casing and having at least one explosive charge receptacle, the inner body having a longitudinal axis and having a center of gravity offset from the longitudinal axis of the inner body;

a first rotational assembly comprising a first structure and a second structure, the first and second structures being rotatable relative to one another, the first structure engaged with at least a portion of the inner body, the second structure engaged with at least a portion of the first sub-assembly, the first rotational assembly rotatably supporting the inner body relative to the outer body and being configured to permit radial orientation of the inner body about the longitudinal axis relative to the outer body based on the center of gravity of the inner body; and

a first electrical conductor at least partially disposed through the first rotational assembly, the first electrical conductor comprising a first electrical contact associated with the inner body and comprising a second electrical contact associated with the first sub-assembly, the first and second electrical contacts being configured contact one another and being configured to conduct electricity therebetween, at least one of the first and second electrical contacts being biased relative to the other one of the first and second electrical contacts.

14. The downhole perforating gun system of claim 13 , wherein the first structure of the first rotational assembly comprises a first housing member of a bearing housing; wherein the second structure of the first rotational assembly comprises a second housing member of the bearing housing; and wherein the first rotational assembly comprises one or more bearings disposed between the first and second housing members of the bearing housing.

15. The downhole perforating gun system of claim 13 , wherein the second structure of the first rotational assembly is engaged with at least a portion of the outer casing.

16. The downhole perforating gun system of claim 13 , wherein at least a portion of the first electrical contact is biased along the longitudinal axis by a spring relative to the second electrical contact.

17. The downhole perforating gun system of claim 13 , wherein at least a portion of the second electrical contact is biased along the longitudinal axis by a spring relative to the first electrical contact.

18. The downhole perforating gun system of claim 13 , wherein the inner body comprises one or more weight elements disposed on the inner body and providing the inner body with the center of gravity offset from the longitudinal axis of the inner body.

19. The downhole perforating gun system of claim 18 , wherein the one or more weight elements are disposed at one or more predefined locations on the inner body and being retained by one or more tabs to the inner body.

20. The downhole perforating gun system of claim 13 , wherein at least a portion of the first electrical contact is insulated.

21. The downhole perforating gun system of claim 13 , wherein the first rotational assembly rotatably supports the first end of the inner body; and the downhole perforating gun system further comprises:

a second rotational assembly rotatably supporting the second end of the inner body; and

a second electrical conductor at least partially disposed through the second rotational assembly and being configured to conduct electricity with the downhole perforating gun system.

22. A downhole perforating gun system, comprising:

an outer body comprising an outer casing and a first sub-assembly, the outer casing having first and second ends and defining an interior therein, the first sub-assembly being configured to connect the first end of the outer casing to the downhole perforating gun system;

an inner body disposed in the interior of the outer casing, the inner body having a longitudinal axis and having at least one explosive charge receptacle;

one or more weight elements disposed on the inner body and providing the inner body with a center of gravity offset from the longitudinal axis of the inner body;

a first rotational assembly comprising a first structure and a second structure, the first and second structures being rotatable relative to one another, the first structure engaged with at least a portion of the inner body, the second structure engaged with at least a portion of the first sub-assembly, the first rotational assembly rotatably supporting the inner body relative to the outer body and being configured to permit radial orientation of the inner body about the longitudinal axis relative to the outer body based on the center of gravity provided by the one or more weight elements; and

a first electrical conductor at least partially disposed through the first rotational assembly, the first electrical conductor comprising a first electrical contact associated with the inner body and comprising a second electrical contact associated with the first sub-assembly, the first and second electrical contacts being configured contact one another and being configured to conduct electricity therebetween, at least one of the first and second electrical contacts being biased relative to the other one of the first and second electrical contacts.

Assignments (3)
NUNC PRO TUNC ASSIGNMENT Recorded Oct 23, 2025
From: MAULDIN, DAWNA; MAULDIN, SIDNEY W.
To: SWM INTERNATIONAL, LLC
Reel/Frame 072656/0481 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jan 14, 2025
From: MAULDIN, DAWNA; MAULDIN, SIDNEY W.
To: SWM INTERNATIONAL INC.
Reel/Frame 069857/0267 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jan 14, 2025
From: SWM INTERNATIONAL, INC.
To: SWM INTERNATIONAL, LLC
Reel/Frame 069857/0391 →
Continuity (5)
Continuation 18751039 · Jun 21, 2024
Continuation 18656426 · May 6, 2024
Continuation 18110804 · Feb 16, 2023
Continuation 17380490 · Jul 20, 2021
Continuation 16293508 · Mar 5, 2019
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