Integrated Selective-Firing Detonator With Grounded Signal Transmission

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Solution Overview

Problem

Existing methods for connecting a selective-firing switch and a large-resistance detonator in oil and gas wells increase the risk of erroneous wiring and accidental detonation, reducing production efficiency and limiting automation.

Innovation Solution

An integrated selective-firing detonator with a detonation transmission device, grounding nut, positioning disc, and selective-detonation mechanism, which includes a shell, selective-firing circuit board, and conducting pogo pins, ensures accurate and efficient detonation control, electrical safety, and stable positioning.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a selective-firing switch and a large-resistance detonator are connected directly by means of a wire, then the detonator can be activated, but the risk of erroneous wiring and accidental detonation increases

Engineering Contradiction:

ImprovesafetyVSAvoidconnection structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the detonator body, firing mechanism, and connection terminals into an integrated selective-firing detonator. The upper and lower shell bodies are clamped together to form a unified structure that combines the detonating element, circuit board, and connection interface, eliminating the need for separate wire connections between switch and detonator.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent introduces an intermediary connection structure consisting of contact pins and contact holes in the circuit board that mediate between the external firing signal and the detonating element. This intermediary mechanism provides controlled electrical connection points that prevent erroneous wiring while enabling reliable detonation.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If manual welding is used for output ports of the selective-firing switch, then connections can be made, but production efficiency decreases and automation is limited

Engineering Contradiction:

Improveproduction efficiencyVSAvoidmanufacturing process

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The patent replaces manual welding operations with a mechanical clamping and insertion system. The upper and lower shell bodies are clamped together with the circuit board positioned between them, and connection pins are inserted into predefined contact holes, eliminating the need for thermal welding processes and enabling automated assembly.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Ease of operation

If the detonator structure is simplified for easier connection, then assembly is faster, but positioning accuracy and reliability of explosive energy transmission may decrease

Engineering Contradiction:

Improveassembly easeVSAvoidpositioning accuracy

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The patent employs asymmetric design elements including a positioning disc with specific geometric features that fit into corresponding recesses in the shell bodies. The connection pins are positioned at asymmetric locations on the circuit board that align with predetermined contact holes, providing precise positioning without requiring complex symmetric alignment procedures.

Inventive Principle:

Principle #4Asymmetry

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

The integrated detonator improves blasting accuracy and efficiency, reduces the risk of accidental detonation, and enhances operational safety and automation by ensuring reliable connection and electrical grounding.

Implementation Method 1

transmitting explosive energy produced by the detonator to a target explosive to realize detonation

Methodology Applied

Scientific EffectDetonation: Detonation

Implementation Method 2

grounding nut... used for guiding unsafe factors caused by abnormal current in the detonator to the ground

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS12467343B1Integrated selective-firing detonator special for oil and gas wells

Publication Date: 2025.11.11 CHENGDU ROCK PETROLEUM CO LTD

AI summary

The invention discloses an integrated selective-firing detonator special for oil and gas wells, including an integrated selective-firing detonator body and a detonation transmission device for receiving and transmitting external detonation signals to control selective firing of perforating bullets. The integration of the detonation transmission device, the selective-firing detonator body, and grounding protection components reduces assembly procedures and improves system integrity and reliability. The cooperation between a control mechanism and a selective-detonation mechanism significantly enhances the reliability of the product. Meanwhile, a grounding nut and a high-temperature shell improve electrical safety. The compact structure simplifies operation and improves working efficiency.