Detonator having a mechanical shunt

Patent metadata

Field	Value
Publication number	US-11719518-B2
Application number	US-202016890608-A
Country	US
Kind code	B2
Filing date	Jun 2, 2020
Priority date	Jun 2, 2020
Publication date	Aug 8, 2023
Grant date	Aug 8, 2023

Abstract

A detonator to activate energetic materials in downhole well environments that can be transported and operated safely. The detonator comprises a switch coupled to a power source and the energetic materials. The power source may or may not be a part of the detonator. The switch creates a default closed switch between the power source and the energetic material. The switch can communicate with an actuator in response to engaging a gun assembly. The switch can create an open switch in response to communicating with the actuator. The switch forms a short circuit when configured to the default closed switch and forms an open circuit when configured to the open switch. The energetic material is activated in response to the mechanical switch forming an open switch and power is provided by the power source.

First claim

What is claimed is:

1. A detonator for controlling activation of an energetic material, the detonator comprising:
a mechanical shunt actionable between a default closed position, and an open position, the shunt in the default closed position is electrically connected with a power source and completes first circuit that prevents power from being supplied to an energetic material as a fail-safe feature comprising a closed switch state with the power source, the shunt in the open position is electrically disconnected from the power source, removes the fail-safe feature, creates an open switch state with the power source that completes a second circuit connecting the power source and the energetic material and supplying power to the energetic material, wherein the mechanical shunt is a conductive material in a concave shape held in the default closed position with stored strain energy;
wherein the mechanical shunt is configured to communicate with an actuator in response to engaging a gun assembly and move from the default closed position to the open position in response to communicating with the actuator; wherein communicating with the actuator comprises reducing the curvature of the mechanical shunt such that it shifts to the open position.

2. The detonator of claim 1 , wherein the energetic material comprises a plurality of explosives arranged in a pattern with respect to the internal diameter of the gun assembly.

3. The detonator of claim 1 , wherein the energetic material comprises a plurality of explosives arranged in one selected from a group comprising a circumferential pattern and stacked pattern with respect to the internal diameter of the gun assembly.

4. The detonator of claim 1 , wherein the mechanical shunt coupled to the power source, is in series with the energetic material or is in parallel with the energetic material.

5. The detonator of claim 1 , wherein the mechanical shunt creates: a short circuit in response to the mechanical shunt configured to the default closed switch state; and an open circuit in response to the mechanical shunt configured to the open switch state.

6. The detonator of claim 1 , wherein the energetic material is activated in response to the mechanical shunt forming an open switch and power provided by the power source.

7. The detonator of claim 1 , wherein the mechanical shunt comprises resilient spring like properties, is held in the open position by an applied force, and automatically returns to the default closed position in response to the removal of the applied force.

8. A gun for controlling activation of an energetic material, the gun comprising:
a gun assembly; and
a mechanical shunt actionable between a default closed position, and an open position, the shunt in the default closed position is electrically connected with a power source and completes a first circuit that prevents power from being supplied to an energetic material as a fail-safe feature comprising a closed switch state with the power source, the shunt in the open position is electrically disconnected from the power source, removes the fail-safe feature, creates an open switch state with the power source, and completes a second circuit connecting the power source and the energetic material and supplying power to the energetic material, wherein the mechanical shunt is a conductive material in a concave shape held in the default closed position with stored strain energy;
wherein the mechanical shunt is configured to communicate with an actuator in response to engaging a gun assembly and move from the default closed position to the open position in response to communicating with the actuator; wherein communicating with the actuator comprises reducing the curvature of the mechanical shunt such that it shifts to the open position.

9. The gun of claim 8 , wherein the energetic material comprises a plurality of explosives arranged in a pattern with respect to the internal diameter of the gun assembly.

10. The gun of claim 8 , wherein the energetic material comprises a plurality of explosives arranged in one selected from a group comprising a circumferential pattern and stacked pattern with respect to the internal diameter of the gun assembly.

11. The gun of claim 8 , wherein the mechanical shunt, coupled to the power source, is in series with the energetic material or is in parallel with the energetic material.

12. The gun of claim 8 , wherein the mechanical shunt creates: a short circuit in response to the mechanical shunt configured to the default closed switch state; and an open circuit in response to the mechanical shunt configured to the open switch state.

13. The gun of claim 8 , wherein the energetic material is activated in response to the mechanical shunt forming the open switch state and power is provided by the power source.

14. The gun of claim 8 , wherein the mechanical shunt comprises resilient spring like properties, is held in the open position by an applied force, and automatically returns to the default closed position in response to the removal of the applied force.

15. A method for controlling activation of an energetic material, the method comprising:
loading a detonator into a gun assembly;
placing the gun assembly in a downhole wellbore environment; and
providing power to the detonator;
providing a mechanical shunt that is actionable between a default closed position, and an open position; wherein the mechanical shunt is a conductive material in a concave shape held in the default closed position with stored strain energy;
electrically connecting the shunt, in the default closed position, with a power source and completing a first circuit that prevents power from being supplied to an energetic material as a fail-safe feature comprising a closed switch state with the power source;
electrically disconnecting the shunt, in the open position, from the power source, removing the fail-safe feature, creating an open switch state with the power source, and completing a second circuit connecting the power source and the energetic material and supplying power to the energetic material; and
configuring the mechanical shunt to communicate with an actuator in response to engaging a gun assembly and to move from the default closed position to the open position in response to communicating with the actuator; wherein communicating with the actuator comprises reducing the curvature of the mechanical shunt such that it shifts to the open position.

16. The method of claim 15 , wherein the energetic material comprises a plurality of explosives arranged in a pattern with respect to the internal diameter of the gun assembly.

17. The method of claim 15 , wherein the energetic material comprises a plurality of explosives arranged in one selected from a group comprising a circumferential pattern and stacked pattern with respect to the internal diameter of the gun assembly.

18. The method of claim 15 , wherein the mechanical shunt, coupled to the power source, is in series with the energetic material or is in parallel with the energetic material.

19. The method of claim 15 , further comprising creating a short circuit in response to the mechanical shunt configured to the default closed switch state, and an open circuit in response to the mechanical shunt configured to the open switch state.

20. The method of claim 15 , further comprising the mechanical shunt having resilient spring like properties, holding the shunt in the open position in response to an applied force, and automatically returning the shunt to the defaul

Assignees

• Halliburton Energy Services Inc

Inventors

• Macgillivray Joseph T
• Hoelscher Christopher C

Classifications

• F42B3/182 Primary

  having shunting means {(F42B3/185 takes precedence; details of shunting devices H01R13/7032)} · CPC title

• F42B3/103

  Mounting initiator heads in initiators; Sealing-plugs · CPC title

• F42C15/34

  wherein the safety or arming action is effected by a blocking-member in the pyrotechnic or explosive train between primer and main charge (F42C15/18, F42C15/40 take precedence) · CPC title

• F42D1/05

  Electric circuits for blasting · CPC title

• F42C19/06

  Electric contact parts specially adapted for use with electric fuzes {(switches operated by change of speed H01H35/06; switches operated by change of acceleration, e.g. shock or vibration, inertia switches H01H35/14; fluid-pressure-operated switches H01H35/24)} · CPC title