Perforating Gun Firing Switch With 360-Degree Grounding

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Solution Overview

Problem

Existing firing switches for perforating guns in wellbores lack ease of installation and have a high risk of accidental misfires, necessitating improved designs for reliable detonation.

Innovation Solution

A firing switch with a disc-shaped body, a grounding collar with resilient fingers, and threaded openings for detonator connections, providing a 360-degree ground connection and easy installation within a cylindrical opening, while eliminating conventional wiring interfaces.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If conventional firing switches with cable connections are used, then electrical connections can be established, but installation becomes complex and time-consuming

Engineering Contradiction:

Improveease of installationVSAvoidconnection complexity

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

The patent extracts the grounding connection function from the complex cable assembly and concentrates it into a single grounding pin that protrudes from the firing switch body. This grounding pin can be directly inserted into the grounding cavity of the perforating gun, eliminating the need for separate grounding cables and simplifying installation significantly.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The firing switch integrates multiple functions into a single compact device: the grounding pin provides both grounding connection and serves as a mechanical alignment feature; the electrical contacts are pre-assembled within the switch body; and the overall design allows the firing switch to be directly inserted into the perforating gun without requiring separate installation steps for grounding and electrical connections.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If traditional firing switch designs are used, then electrical connections can be made, but the risk of accidental misfires increases

Engineering Contradiction:

Improvedetonation reliabilityVSAvoidaccidental misfire risk

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent implements a mechanical interlock mechanism where the grounding pin must be physically inserted into the grounding cavity before the electrical contacts can be engaged. This sequential mechanical constraint ensures that the firing switch cannot be accidentally activated without proper grounding, thereby preventing accidental misfires while maintaining reliable detonation when properly installed.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The grounding pin acts as an intermediary mechanical element that mediates between the firing switch and the perforating gun grounding cavity. It provides a physical barrier and alignment feature that ensures proper connection before electrical engagement, thereby reducing the risk of accidental misfires while maintaining reliable detonation capability.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If conventional wiring interfaces are used, then electrical connections can be established, but installation time increases

Engineering Contradiction:

Improveinstallation speedVSAvoidinstallation time

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The patent segments the connection process into two distinct but integrated parts: the grounding pin insertion and the electrical contact engagement. The grounding pin is pre-assembled with the firing switch body, allowing both grounding and electrical connections to be established in a single insertion motion, thereby reducing installation time while maintaining connection reliability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The grounding pin and electrical contacts are pre-assembled within the firing switch body before deployment. This preliminary assembly eliminates the need for separate grounding cable connection and electrical contact installation steps, allowing the entire connection process to be completed in a single insertion action, thereby significantly reducing installation time.

Inventive Principle:

Principle #10Preliminary action

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Ensures reliable detonation of perforating guns with reduced accidental misfires and simplified installation, enhancing safety and efficiency in downhole operations.

Implementation Method 1

a grounding collar with resilient fingers, providing a 360-degree ground connection

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS12448874B2Perforating gun firing switch

Publication Date: 2025.10.21 HARRISON JET GUNS II LP

AI summary

An improved firing switch for a perforating gun is provided. The firing switch includes a contact pin extending from a disc-shaped body portion, the contact pin providing an electrical connection for uphole communications. The firing switch also includes a ring-shaped grounding collar disposed about the outer periphery of the disc-shaped body portion, the grounding collar including a plurality of resilient fingers extending outwardly therefrom. The disc-shaped body portion further includes a plurality of axial openings, in lieu of a wiring interface, for a positive detonator connection and a negative detonator connection. The plurality of axial openings are disposed radially outward of the contact pin, which is centrally disposed on the disc-shaped body portion opposite of a threaded post.