Modular Cartridge Sub for Perforating Gun Signal Reliability
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Solution Overview
Problem
Perforating systems face challenges in maintaining continuous electrical communication along long strings of perforating guns due to failure points at connectors, which complicates detonation initiation and poses safety risks during assembly and storage, especially in inclement weather.
Innovation Solution
A modular perforating string with a cartridge sub having a receptacle fitting, a detonator, and a lead line with a switch for regulating electricity, allowing for seamless electrical connection between perforating guns and reducing the need for manual assembly, thereby ensuring consistent detonation signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If multiple connectors are used to make up the signal line through successive connecting subs and perforating guns, then the signal line can be extended to cover the entire string length, but failure points are introduced at each connector
Solution Approach 1:
The system is divided into modular cartridge subs, each containing a complete detonator assembly. This segmentation allows the signal line to be extended through multiple connectors while maintaining reliability, as each module is self-contained and can be independently tested and replaced.
Solution Approach 2:
Redundant electrical pathways are built into the cartridge sub design, with backup connection points and alternative signal routes. This beforehand cushioning ensures that if one connector or pathway fails, the signal can still reach the detonator through alternative paths.
2Object-affected harmful factors
If detonators are connected to detonating cords in the field just prior to use, then shipping and storage security is improved, but manual handling of high-explosive components increases safety risks
Solution Approach 1:
The detonator, detonating cord, and electrical connection components are merged into a single pre-assembled cartridge sub unit. This combining allows the explosive components to be shipped and stored securely as an integrated module, while still enabling easy field installation by simply inserting the complete cartridge into the perforating gun.
Solution Approach 2:
The detonator assembly is preliminarily prepared and tested in a controlled manufacturing environment before being shipped to the field. This preliminary action ensures that all explosive components are properly connected and functional before handling by field personnel, reducing safety risks during field operations.
3Adaptability or versatility
If the perforating string is made up of successive connecting subs and perforating guns, then the string can be assembled in the field, but the assembly process becomes complex and time-consuming
Solution Approach 1:
The cartridge sub is designed as a universal module that can be inserted into various perforating gun configurations and connects to standard receptacle fittings. This multi-functionality allows the same cartridge design to be used across different gun types and string configurations, simplifying field assembly while maintaining adaptability.
Solution Approach 2:
The cartridge sub contains nested components within a compact housing - the detonator, electrical connections, and detonating cord are all contained within the single cartridge body. This nesting allows the complex explosive assembly to be packaged in a compact, easy-to-handle format that simplifies field installation.
4Productivity
If manual connection of detonators to detonating cords is performed in inclement weather, then field assembly can proceed, but technician safety and connection reliability are compromised
Solution Approach 1:
The cartridge sub is designed to be self-contained and self-protecting, with sealed electrical connections and protected explosive components that do not require manual manipulation during field installation. This self-service design allows technicians to install the cartridge without exposing themselves to hazardous conditions or risking connection reliability due to weather factors.
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
This solution enhances safety by minimizing manual handling of high-explosive components, reduces shipping and storage concerns, and streamlines the assembly process, ensuring reliable detonation across the perforating string.
Implementation Method 1
a detonator in the cartridge sub and having a detonating end adjacent to and directed towards the upstream end
Implementation Method 2
a lead line in the cartridge sub having an end in selective communication with an electrical source and another end in communication with an inlet to the detonator
Data Source
Figure 1
Figure 2
Figure 2
AI summary
A cartridge assembly for use with a perforating system having a contact terminal that connects to a perforating signal line when inserted into a receptacle end of a perforating gun. A detonator may be included in an end of the cartridge assembly for initiating a detonating cord in the perforating gun. The cartridge assembly is a modular unit that replaces the manual connections made when assembling a string of perforating guns. The cartridge assembly may optionally include a controller switch for controlling current flow through the cartridge assembly.