阅读说明：本技术 具有机械分流器的雷管 (Detonator with mechanical shunt ) 是由 J·T·麦吉利夫雷 C·C·霍尔舍 于 2021-04-21 设计创作，主要内容包括：本发明提供一种雷管,其用于在井下井环境中活化可安全运输和操作的高能材料。所述雷管包括连接到电力源和所述高能材料的开关。所述电力源可以是或可以不是所述雷管的一部分。所述开关在所述电力源与所述高能材料之间产生默认闭合开关。所述开关可响应于接合枪装配件而与致动器连通。所述开关可响应于与所述致动器连通而产生断开开关。所述开关在配置成所述默认闭合开关时形成短路,且在配置成所述断开开关时形成开路。所述高能材料响应于所述机械开关形成断开开关以及由所述电力源提供电力而活化。(The present invention provides a detonator for activating a high energy material that can be safely transported and handled in a downhole well environment. The detonator includes a switch connected to a source of electrical power and the energetic material. The electrical power source may or may not be part of the detonator. The switch creates a default closed switch between the source of electrical power and the energetic material. The switch may be in communication with the actuator in response to engaging the gun mount. The switch may generate an open switch in response to communication with the actuator. The switch forms a short circuit when configured as the default closed switch and forms an open circuit when configured as the open switch. The energetic material is activated in response to the mechanical switch forming an open switch and power being provided by the electrical power source.)

1. A detonator for controlling the activation of an energetic material, said detonator comprising:

a mechanical switch connected to an electrical power source and the energetic material, the mechanical switch creating a default closed switch between the electrical power source and the energetic material, communicating with an actuator in response to engaging a gun mount, and creating an open switch in response to communicating with the actuator.

2. The detonator of claim 1 wherein the energetic material comprises a plurality of explosive charges arranged in a pattern relative to an inner diameter of the gun mount, and optionally wherein the energetic material comprises a plurality of explosive charges arranged in a pattern selected from the group consisting of: a circumferential pattern and a stacked pattern relative to the inner diameter of the gun mount.

3. The detonator of claim 1 wherein the mechanical switch is a switch selected from the group comprising:

in parallel and in series with the power supply; and

in parallel and in series with the energetic material.

4. The detonator of claim 1 wherein the mechanical switch: generating a short circuit in response to the mechanical switch being configured as the default closed switch; and creating an open circuit in response to the mechanical switch being configured as the disconnect switch.

5. The detonator of claim 1 wherein the energetic material is activated in response to the mechanical switch forming an open switch and being powered by the electrical power source, and optionally wherein the mechanical switch returns to the default closed switch in response to disengagement from the gun mount.

6. A gun for controlling activation of energetic materials, the gun comprising:

a gun mount;

a mechanical switch connected to an electrical power source and the energetic material, the mechanical switch creating a default closed switch between the electrical power source and the energetic material, communicating with an actuator in response to engaging a gun mount, and creating an open switch in response to communicating with the actuator.

7. The gun of claim 6, wherein the energetic material comprises a plurality of explosive charges arranged in a pattern relative to an inner diameter of the gun mount, and optionally wherein the energetic material comprises a plurality of explosive charges arranged in a pattern selected from the group consisting of: a circumferential pattern and a stacked pattern relative to the inner diameter of the gun mount.

8. The gun of claim 6, wherein the mechanical switch is a switch selected from the group comprising:

in parallel and in series with the power supply; and

in parallel and in series with the energetic material.

9. The gun of claim 6, wherein the mechanical switch: generating a short circuit in response to the mechanical switch being configured as the default closed switch; and creating an open circuit in response to the mechanical switch being configured as the disconnect switch.

10. The gun of claim 6, wherein the energetic material is activated in response to the mechanical switch forming an open switch and being powered by the electrical power source and optionally wherein the mechanical switch returns to the default closed switch in response to disengagement from the gun mount.

11. A method for controlling activation of an energetic material, the method comprising:

loading a detonator into the gun mount;

placing the gun assembly in a downhole wellbore environment; and

providing power to the detonator;

a mechanical switch connected to an electrical power source and the energetic material, the mechanical switch creating a default closed switch between the electrical power source and the energetic material, communicating with an actuator in response to engaging a gun mount, and creating an open switch in response to communicating with the actuator.

12. The method of claim 11, wherein the energetic material comprises a plurality of explosive charges arranged in a pattern relative to an inner diameter of the gun mount, and optionally wherein the energetic material comprises a plurality of explosive charges arranged in a pattern selected from the group consisting of: a circumferential pattern and a stacked pattern relative to the inner diameter of the gun mount.

13. The method of claim 11, wherein the mechanical switch is a switch selected from the group comprising:

in parallel and in series with the power supply; and

in parallel and in series with the energetic material.

14. The method of claim 11, further comprising generating a short circuit in response to the mechanical switch being configured as the default closed switch and generating an open circuit in response to the mechanical switch being configured as the open switch.

15. The method of claim 11, further comprising returning to the default closed switch in response to disengaging from the gun mount.

Technical Field

The present application relates to detonators, and in particular to detonators having mechanical shunts.

Background

Explosive charges are commonly used in perforating guns which deliver a wellbore down into a well through a wellbore casing or liner to create perforations (holes) to allow hydrocarbon fluids from the formation to flow into the well. The fluid may then be pumped to the surface for further processing. Safety regulations and best practices are implemented to regulate the transport of these explosives. Explosives, detonators and other perforating gun assemblies may be transported between the storage device and the point of hole when the detonator is in a state that prevents activation of the explosive. When at the well site, the user may place the detonator in a state ready to activate the detonator so that the detonator may be detonated or triggered.

Disclosure of Invention

The present application provides a detonator for controlling activation of an energetic material, the detonator may comprise: a mechanical switch connected to the power source and the energetic material, the mechanical switch creating a default closed switch between the power source and the energetic material, communicating with the actuator in response to engaging the gun mount, and creating an open switch in response to communicating with the actuator.

The energetic material may include a plurality of explosive charges arranged in a pattern relative to an inner diameter of the gun mount.

The energetic material may comprise a plurality of explosive materials arranged in a pattern selected from the group consisting of: a circumferential pattern and a stacked pattern relative to the inner diameter of the gun mount.

The mechanical switch may be a switch selected from the group consisting of: a switch connected in parallel and in series with the power supply; a switch in parallel and in series with the energetic material.

The mechanical switch may: generating a short circuit in response to the mechanical switch being configured to close the switch by default; and creating an open circuit in response to the mechanical switch being configured to open the switch.

The mechanical switch may return to a default closed switch in response to disengagement from the gun mount.

The present application further provides a gun for controlling activation of energetic materials, the gun comprising: a gun mount; a mechanical switch connected to the power source and the energetic material, the mechanical switch creating a default closed switch between the power source and the energetic material, communicating with the actuator in response to engaging the gun mount, and creating an open switch in response to communicating with the actuator.

The energetic material may include a plurality of explosive charges arranged in a pattern relative to the inner diameter of the gun mount.

The energetic material may comprise a plurality of explosive materials arranged in a pattern selected from the group consisting of: a circumferential pattern and a stacked pattern relative to the inner diameter of the gun mount.

The mechanical switch may be a switch selected from the group consisting of: a switch connected in parallel and in series with the power supply; and a switch in parallel and in series with the energetic material.

The mechanical switch may: generating a short circuit in response to the mechanical switch being configured to close the switch by default; and creating an open circuit in response to the mechanical switch being configured to open the switch.

The energetic material may be activated in response to a mechanical switch forming an open switch and power being provided by a power source.

The mechanical switch may return to a default closed switch in response to disengagement from the gun mount.

The present application also provides a method for controlling activation of an energetic material, the method comprising: loading a detonator into the gun mount; placing the gun assembly in a downhole wellbore environment; and providing power to the detonator; a mechanical switch is connected to the power source and the energetic material, the mechanical switch creating a default closed switch between the power source and the energetic material, communicating with the actuator in response to engaging the gun mount, and creating an open switch in response to communicating with the actuator.

The energetic material may include a plurality of explosive charges arranged in a pattern relative to the inner diameter of the gun mount.

The energetic material may comprise a plurality of explosive materials arranged in a pattern selected from the group consisting of: a circumferential pattern and a stacked pattern relative to the inner diameter of the gun mount.

The mechanical switch may be a switch selected from the group consisting of: a switch connected in parallel and in series with the power supply; and a switch in parallel and in series with the energetic material.

The mechanical switch may: generating a short circuit in response to the mechanical switch being configured to close the switch by default; and creating an open circuit in response to the mechanical switch being configured to open the switch.

The energetic material may be activated in response to a mechanical switch forming an open switch and power being provided by a power source.

The mechanical switch may return to a default closed switch in response to disengagement from the gun mount.

Drawings

For a more complete understanding of the features and advantages of the present disclosure, reference is now made to the detailed description and accompanying drawings, wherein corresponding reference numerals in the different figures refer to corresponding parts, and wherein:

FIG. 1 is an illustration of a schematic diagram of a hole for drilling hydrocarbons in a formation;

FIG. 2A is an illustration of a partial cutaway view of a configuration of a perforating gun and detonator, according to some example embodiments;

FIG. 2B is a diagram of a detonator circuit for use with a detonator according to some example embodiments;

figure 3A is a diagram of a detonator circuit having a mechanical shunt in a default closed position, according to some example embodiments;

figure 3B is an illustration of a detonator and mechanical shunt in an open position, according to some example embodiments;

fig. 3C is an illustration of an isometric view of a mechanical diverter in a closed position, according to some example embodiments;

fig. 3D is an illustration of an isometric view of a mechanical diverter in an open position, according to some example embodiments;

FIG. 4A is an illustration of a perforating gun and detonator with an alternative mechanical diverter configuration, according to some example embodiments;

FIG. 4B is an illustration of a detonator having a detonator circuit with an alternative mechanical shunt configuration, wherein the mechanical shunt is in a closed circuit configuration, in accordance with certain example embodiments; and

figure 4C is an illustration of a detonator having a detonator circuit with a mechanical shunt in an open circuit configuration according to some example embodiments.

Detailed Description

In the following detailed description of several illustrative embodiments, reference is made to the accompanying drawings, which form a part hereof. These embodiments are described in sufficient detail to enable those skilled in the art to practice the disclosed subject matter, and it is to be understood that other embodiments may be utilized and that logical structural, mechanical, electrical, and chemical changes may be made without departing from the spirit or scope of the present invention. To avoid detail not necessary to enable those skilled in the art to practice the embodiments described herein, the description may omit certain information known to those skilled in the art. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the illustrative embodiments is defined only by the appended claims.

The present disclosure relates to a detonator for initially igniting energetic materials used in oil and gas wells during the completion or production phase of the well. The detonator may be any type of initiation device for initiating activation of the energetic material. As referred to herein, "energetic materials" generally include explosive materials, and may also include other sources of energy, such as pyrotechnic composition propellants, or other materials used to perforate a casing, tubing, or conduit disposed in a well. The improved detonator includes a mechanical diverter operable between a default closed position and an open position. The location of the diverter is dependent upon engagement of the diverter by an engagement member or engagement members associated with the perforating gun, wherein the detonator is positioned prior to placement downhole in the wellbore. The engagement member does not engage the shunt prior to placement of the detonator in the perforating gun, which causes the shunt to remain in the default closed position. As described in more detail herein, the shunt in the closed position provides a complete circuit that prevents the transmission of the initiation signal to the energetic material. This closed position of the diverter is the default position because of the need to prevent premature ignition or detonation of the energetic material. When initiation of the energetic material is required, the detonator is placed within the perforating gun, which may be done prior to placement in the well. The engagement member preferably engages the diverter when the detonator is placed within the perforating gun and the diverter is moved to the open position. In the open position, the power supplied to the detonator will no longer pass current through the shunt, but will pass current to the energetic material to produce detonation.

The diverter acts as a safety device that prevents the supply of electrical power to the energetic material when the diverter is in the default closed position. This prevents premature detonation of the detonator. When a detonator is connected to or inserted within the perforating gun, movement of the diverter to the open position removes the fail-safe feature and allows initiation of the energetic material when electrical power (i.e., current) is delivered to the energetic material.

FIG. 1 illustrates a schematic of a well 10 for drilling hydrocarbons from a formation 11. The wellsite operations 10 include a runner and controller system 12 for running a perforating gun 14 down a wellbore 16 through a wellhead 18, and providing power to the perforating gun 14 using a run string 20. The wellbore 16 is drilled to drill the formation from the surface of the well 10. The perforating gun 14 also includes a detonator 22 and a plurality of charges 24 within the Inner Diameter (ID) of the body 26 or on the exterior of the body 26. The body 26 is the housing of the perforating gun 14 that contains the explosive 24 and is engaged with the detonator 22. Detonator 22 includes an electrical circuit, which may also be part of running string 20, communicatively connected to a power line and explosive 24. The circuit includes a mechanical shunt that is automatically movable between a default closed position and an open position. The mechanical diverter automatically defaults to the closed position when a detonator is not loaded into the perforating gun 14. The mechanical diverter automatically generates a disconnect switch in response to interaction with the engagement member of the perforating gun 14. The engagement member may in some cases be an actuator, nipple or other protruding structure on the perforating gun 14. Once the disconnect switch is generated, power may be provided to the detonator circuit, in which case the explosive charge 24 is ignited and perforations 28 are created in the wellbore 30 and the formation 11 to provide fluid communication with the formation. However, in some operations, the well 10 may not be cylindrical. In a perforating operation, the perforating gun 14 may be used to perforate other tubing or conduits downhole.

In the case of a detonator circuit, closing the switch is a circuit that may provide little or no resistance to draw current from the explosive 24 and thereby prevent ignition or detonation, as further detailed with respect to fig. 2-4. Additionally, closing the switch may include a non-conductive path generated in the circuit, such as described in further detail with respect to fig. 4A. An open switch is a circuit that provides sufficient resistance to draw electricity from an electrical power source to power the energetic material. Opening the switch may be used to create a circuit having a resistance sufficient to cause current to flow through another circuit, such as described in further detail with respect to fig. 2-4. Additionally, the disconnect switch may be used to create a conductive path in the circuit, such as described in further detail with respect to fig. 4A. Although a power cord is disclosed that transfers power from the surface to the detonator 22, it is understood that the source of power may be part of the detonator 22 or perforating gun 14. In that particular embodiment, the power source may be triggered by a radio signal or a timer. A default mode of power as used herein may be a mode in which the power source is not immediately enabled to deliver power from the power source to the circuit until the default mode becomes the active mode. The active mode may be a mode in which power is transferred from the power source to the circuit. The circuitry in this specification may include any conductive path and may be used to selectively initiate ignition of the energetic material. As described herein, the engagement means may include a device that can manipulate the position of the mechanical shunt. As disclosed herein, a mechanical shunt may include a conductive path that itself (or surrounding structure carrying the conductive path) may be physically manipulated to selectively open, close, or otherwise controllably alter the circuit. For example, a mechanical shunt may have an electrical path with elastic or spring-like properties that may remain in one position in response to an applied force and automatically return to a default position in response to removal of the force. As described herein, the Force (FA) is the amount of force required to displace the spring to an extent sufficient to cause current to flow through different paths. The mechanical diverter may have different shapes, as will be discussed below with reference to fig. 3 and 4. The perforating gun 14 is used to create perforations in the wellbore 28 and the formation. However, any operation using a jarring tool is applicable, where explosives are initiated downhole to create a jarring effect on the tool string. Basically, the detonator 22 can be used with any device that requires the safe transportation or storage of energetic materials.

Referring now to FIG. 2A, a partial cross-sectional view of an example configuration of a perforating gun 14 having a detonator 22 is illustrated, in accordance with certain example embodiments. In the assembled state, the perforating gun 14 includes a detonator 22, a body 26 having a plurality of holes, and an engagement member 36. The detonator 22 includes a detonator circuit 22a having a mechanical shunt and an explosive charge 24. When the detonator 22 is engaged with the perforating gun 14 and the engagement member 36 is in communication with the mechanical shunt of the detonator circuit 22a to which a sufficient force FA is applied, the mechanical shunt is moved to the open position. In some embodiments, the engagement member 36 may be part of the detonator 22. As an example, the embodiment of fig. 2A may not include the engagement member 36, but the engagement member 36 may be part of the circuit 22A. In other words, the electrical circuit 22a may move in response to causing the mechanical shunt to open when the detonator 22a is engaged with the body 26 of the perforating gun 14. As previously stated, the explosive charge 24 may be ignited when the mechanical diverter is in the open position. When the detonator is not engaged with the perforating gun 14, the mechanical shunt of the circuit is in the closed position, which prevents current flow to the explosive 24.

Referring now to fig. 2B, a detonator circuit 22a is illustrated according to some example embodiments. The detonator circuit 22a includes an electrical power source 32, a mechanical shunt 34, and an explosive charge 24. In this particular embodiment, the detonator circuits 22a are arranged in a parallel configuration, although other configurations are possible. The actual power from the power source 32 may come from a remote source delivered via a power cord that is connected with the rest of the circuitry of the detonator 22. Additionally, the power source 32 may be in the form of a radio or time controlled battery that is part of the perforating gun 14 or detonator 22.

Referring now to fig. 3A, the detonator 22 and the mechanical shunt 34 are illustrated in a default closed position, according to some example embodiments. When the detonator 22 is not engaged with the perforating gun 14, the diverter 34 is in a default closed position, which provides an alternative closed circuit to the circuit containing the explosive 24. This prevents the energetic material from being ignited by the electrical power source 32. In this configuration, the detonator 22 containing the detonator circuit 22a and the explosive 24 can be safely transported.

Referring now to fig. 3B, the detonator 22 and the mechanical shunt 34 are illustrated in an open position, according to some example embodiments. Once the detonator 22 is engaged with the perforating gun 14, the diverter 34 is manipulated into the open position. At this point, current from the power source 32 may be delivered to the explosive charge 24, which power source 32 may be controlled by a user at the surface of the well, or activated by a radio signal or activated by a timer. After use, the detonator 22 containing the detonator circuit 24 and explosive can be removed from the perforating gun 14, and the diverter 34 returned to the default closed position, ready for safe transport. You do not know if everything is normal. It is possible that not all of the explosive is ignited. ]

Referring now to fig. 3C, an isometric view of the mechanical diverter 34 of fig. 3A in a closed position is illustrated, according to some example embodiments. The detonator 22 contains a detonator circuit 22a with a mechanical shunt 34. The body of the detonator 22 may comprise an electrically conductive material used to form the detonator circuit 22 a. In this state, the detonator 22 can be safely transported.

Referring now to fig. 3D, an isometric view of the mechanical diverter 34 of fig. 3B in an open position is illustrated, according to some example embodiments. In this state, the explosive 24 of the detonator circuit 22 may be ignited. In order for the detonator 22 to enter this state, the mechanical shunt 34 must be manipulated into that position.

Referring now to FIG. 4A, a perforating gun 14 and detonator 22 having an alternative diverter configuration is illustrated according to some example embodiments. Detonator 22 includes a male conductor 38, which male conductor 38 is connected to explosive charge 24, to an insulator 40a by a spring 42, and to engagement member 36 by another insulator 40 b. The detonator 22 further comprises a female conductor 44 connected to the electrical power source 32. Likewise, the detonator 22 and the body 26 are parts that can be separated for shipping purposes and connected together for operational purposes. The circuit 22a includes a non-conductive path and, therefore, the circuit 22a cannot ignite the charge 24. Once the detonator 22 is engaged with the actuator 36 of the perforating gun 26, the force FA exerted by the engagement member 36 on the male conductor 38 displaces the spring 42 to an extent sufficient to cause the male conductor 38 to engage the female conductor 44 and the circuit 22a to be complete. At this point, power from the power source 32 may be provided and the explosive charge 24 ignited.

Referring now to fig. 4B, a detonator 22 having a detonator circuit 22a with an alternative mechanical shunt configuration is illustrated, wherein the mechanical shunt is in a closed circuit configuration, according to some example embodiments. The detonator 22 comprises a spring 42, a conductive element 46 with a ground connection, and a detonator circuit 22 a. The detonator circuit 22a includes a mechanical shunt 50 and an explosive charge 24 disposed on a shaft. In this state, current from the power source 32 is conducted away from the explosive 24, through the shunt 50, the conductive element 46, and back to the power source 32. Essentially, the conductive element 46 prevents current from forming on a portion of the circuit 22a connecting the charges 24 together and having the power source 32.

Referring now to fig. 4C, a detonator 22 having a detonator circuit 22a with a mechanical shunt 50 in an open configuration is illustrated, according to some example embodiments. In this condition, the detonator 22 engages the body 26 of the perforating gun 14, causing the spring 42 to compress. When compressed, contact between the shunt 50 and the conductive element 46 is removed and contact is established between the body 26, the shunt 50 and the portion of the circuit 22a connecting the explosive charges 24 together and having the power source 32. The shunt 50 and the body 26 form a conductive path with ground so that current is formed on the portion of the circuit 22a connecting the charges 24 together and having the power source 32.

The embodiments disclosed above have been shown for illustrative purposes and to enable one of ordinary skill in the art to practice the disclosure, but the disclosure is not intended to be exhaustive or limited to the forms disclosed. Numerous insubstantial modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the disclosure. The scope of the claims is intended to broadly cover the disclosed embodiments and any such modifications. Furthermore, the following items represent additional embodiments of the present disclosure and should be considered within the scope of the present disclosure:

clause 1, a detonator for controlling activation of an energetic material, the detonator comprising: a mechanical switch connected to the power source and the energetic material, the mechanical switch creating a default closed switch between the power source and the energetic material, communicating with the actuator in response to engaging the gun mount, and creating an open switch in response to communicating with the actuator;

clause 2, the detonator of clause 1 wherein the energetic material comprises a plurality of explosive charges arranged in a pattern relative to an inner diameter of the gun mount;

clause 3, the detonator of clause 1 wherein the energetic material comprises a plurality of explosive materials arranged in a pattern selected from the group consisting of: a circumferential pattern and a stacking pattern relative to an inner diameter of the gun mount;

clause 4, the detonator of clause 1, wherein the mechanical switch is a switch selected from the group consisting of: in parallel and in series with a power supply; and in parallel and in series with the energetic material;

clause 5, the detonator of clause 1, wherein the mechanical switch: generating a short circuit in response to the mechanical switch being configured to close the switch by default; and generating an open circuit in response to the mechanical switch being configured to open the switch;

clause 6, the detonator of clause 1 wherein the energetic material is activated in response to the mechanical switch forming an open switch and the power being provided by the power source;

clause 7, the detonator of clause 1 wherein the mechanical switch returns to the default closed switch in response to disengagement from the gun mount;

clause 8, a gun for controlling activation of energetic materials, the gun comprising: a gun mount; a mechanical switch connected to the power source and the energetic material, the mechanical switch creating a default closed switch between the power source and the energetic material, communicating with the actuator in response to engaging the gun mount, and creating an open switch in response to communicating with the actuator;

clause 9, the gun of clause 8, wherein the energetic material comprises a plurality of explosive charges arranged in a pattern relative to an inner diameter of the gun mount;

clause 10, the gun of clause 8, wherein the energetic material comprises a plurality of explosive charges arranged in a pattern selected from the group consisting of: a circumferential pattern and a stacking pattern relative to an inner diameter of the gun mount;

clause 11, the gun of clause 8, wherein the mechanical switch is a switch selected from the group consisting of: in parallel and in series with a power supply; and in parallel and in series with the energetic material;

clause 12, the gun of clause 8, wherein the mechanical switch: generating a short circuit in response to the mechanical switch being configured to close the switch by default; and generating an open circuit in response to the mechanical switch being configured to open the switch;

clause 13, the gun of clause 8, wherein the energetic material is activated in response to the mechanical switch forming an open switch and the power being provided by the power source;

clause 14, the gun of clause 8, wherein the mechanical switch returns to a default closed switch in response to disengagement from the gun mount;

the article 15, a method for controlling activation of an energetic material, the method comprising: loading a detonator into the gun mount; placing the gun assembly in a downhole wellbore environment; and providing power to the detonator; a mechanical switch connected to the power source and the energetic material, the mechanical switch creating a default closed switch between the power source and the energetic material, communicating with the actuator in response to engaging the gun mount, and creating an open switch in response to communicating with the actuator;

clause 16, the method of clause 15, wherein the energetic material comprises a plurality of explosive charges arranged in a pattern relative to an inner diameter of the gun mount;

clause 17, the method of clause 15, wherein the energetic material comprises a plurality of explosive charges arranged in a pattern selected from the group consisting of: a circumferential pattern and a stacking pattern relative to an inner diameter of the gun mount;

clause 18, the method of claim 15, wherein the mechanical switch is a switch selected from the group comprising: in parallel and series with the power supply: and in parallel and in series with the energetic material;

clause 19, the method of clause 15, further comprising generating a short circuit in response to the mechanical switch being configured to close the switch by default, generating an open circuit in response to the mechanical switch being configured to open the switch; and

clause 20, the method of clause 15, further comprising returning to a default closed switch in response to disengaging from a gun mount.