Loading Tube Engagement Structures for Perforating Guns
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Solution Overview
Problem
The existing perforating gun systems face challenges with plastic jackets, including high modification costs, reduced shot density, and debris creation when using shaped charges of different sizes, which limits adaptability and efficiency in wellbore operations.
Innovation Solution
A loading tube design with a tubular member and engagement structures, such as center plates or inner tubular members, that securely engage primer ends of shaped charges without plastic jackets, allowing for flexible sizing and reduced debris generation, using detonating cords for connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If plastic jackets are used to restrain shaped charges in the loading tube, then the shaped charges are securely held in place, but modifications require re-tooling with heavy initial investment and long implementation time
Solution Approach 1:
The loading tube is divided into modular sections with standardized engagement structures (such as center plates or inner tubular members) that can be independently replaced. This segmentation allows specific components to be swapped without requiring complete re-tooling of the entire system, reducing modification costs and time while maintaining secure charge restraint.
Solution Approach 2:
The engagement structures (center plates, inner tubular members) are designed with universal features that can accommodate multiple shaped charge sizes and configurations. These standardized components serve multiple functions including charge restraint, alignment, and detonation cord routing, eliminating the need for custom plastic jackets for each charge type.
2Reliability
If plastic jackets are used to hold shaped charges, then the charges are restrained in place, but the maximum shot density is reduced
Solution Approach 1:
The plastic jacket component is completely removed from the system and replaced with engagement structures integrated directly into the loading tube (center plates or inner tubular members). This extraction eliminates the space-consuming plastic jackets while maintaining charge restraint functionality, thereby increasing the number of charges that can be accommodated in the same loading tube volume.
3Reliability
If plastic jackets are used for shaped charge restraint, then the charges are secured, but plastic debris is created after detonation that hinders production and may stop the well
Solution Approach 1:
The plastic jacket material is completely removed from the system and replaced with metal engagement structures (center plates or inner tubular members) that are either left behind in the formation or retrieved with the gun. This extraction eliminates the generation of plastic debris that would otherwise contaminate the wellbore and hinder production after detonation.
Solution Approach 2:
The material composition of the restraint structure is changed from plastic (organic polymer) to metal (inorganic material). This parameter change in material type fundamentally alters the debris characteristics after detonation, replacing problematic plastic debris with metal fragments that are either acceptable in the formation or can be more easily managed through retrieval systems.
4Manufacturing precision
If existing jackets and loading tubes are designed for specific charge sizes, then the charges fit properly, but smaller charges in larger guns require modifications and re-engineering
Solution Approach 1:
The engagement structures (center plates with openings, inner tubular members with openings) are designed with standardized dimensions and features that can accommodate multiple shaped charge sizes. By varying only the charge diameter while using the same loading tube and engagement structure type, the system achieves versatility across different charge sizes without requiring custom designs, while maintaining precise fit through the standardized opening configurations.
Solution Approach 2:
The system allows dynamic adaptation to different charge sizes through the use of standardized engagement structures that can accommodate varying charge dimensions. The openings in the center plates or inner tubular members can be configured to match different charge sizes, enabling the same basic structure to adapt to various operational requirements without requiring complete re-engineering.
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
Enables efficient and cost-effective use of shaped charges of varying sizes in perforating guns, enhancing shot density and minimizing debris, thus improving well production and reducing operational complexities.
Implementation Method 1
A detonating cord connects the shaped charges in the loading tube into the ballistic train of the perforating gun string
Data Source
AI summary
A loading tube for use in a perforating gun is disclosed which eliminates the necessity for utilization of plastic jackets to restrain shaped charges. The loading tube comprises a first tubular member and an engagement structure in the first tubular member in which the primer ends of the shaped charges may be installed. These engagement structures may be a center plate or inner tubular members. In each of the disclosed embodiments, a detonating cord connects the primer ends of the shaped charges which are installed in the loading tube.