Monolithic Charge Tube for Perforating Tools
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current perforating tools for wellbores face challenges in efficiently and securely housing shaped charges and ensuring proper detonation and debris management, leading to inefficiencies in creating fluid communication between the wellbore and subterranean formation.
Innovation Solution
A monolithic charge tube with reduced and expanded diameter sections, integrated with a stress riser and outer housing, is designed to securely house shaped charges and fragment upon detonation, ensuring effective perforation and debris management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional charge tube design is used, then the shaped charge can be housed, but the alignment and secure housing are insufficient leading to reliability issues
Solution Approach 1:
The charge tube is segmented into multiple functional zones including an expanded diameter section for centralized alignment, a reduced diameter section for debris ejection, and a frangible section with stress risers for controlled fragmentation. This segmentation allows each section to perform its specific function optimally while maintaining overall reliability.
Solution Approach 2:
Different sections of the charge tube have different diameters and properties tailored to their specific functions. The expanded diameter section provides alignment stability, the reduced diameter section facilitates debris ejection, and the frangible section with stress risers enables controlled breakup. This local differentiation of properties enhances overall system reliability without requiring complex external mechanisms.
2Ease of manufacture
If a monolithic charge tube is used, then manufacturing is simplified, but debris management and fragmentation control are insufficient
Solution Approach 1:
Stress risers are pre-formed in the frangible section of the charge tube during manufacturing. These stress risers create predetermined weak points that will initiate fragmentation when the charge tube is subjected to explosive forces. This preliminary action ensures controlled debris generation without requiring complex post-manufacturing assembly.
Solution Approach 2:
The charge tube transitions from a uniform monolithic structure to one with varying diameter parameters along its length. The expanded and reduced diameter sections create natural stress distribution patterns during detonation that facilitate controlled fragmentation at the frangible section, managing debris generation while maintaining ease of monolithic manufacture.
3Object-generated harmful factors
If the charge tube is designed to fragment, then debris disposal is improved, but the structural integrity during operation may be compromised
Solution Approach 1:
The charge tube is divided into a strong, intact section (expanded diameter) for operational integrity and a frangible section (reduced diameter with stress risers) for controlled fragmentation. This segmentation allows the tube to maintain strength where needed while enabling debris disposal where beneficial.
Solution Approach 2:
The frangible section has locally reduced strength due to the presence of stress risers and reduced diameter, creating a controlled weakness zone. This local quality change ensures that fragmentation occurs only in the intended frangible section while the expanded diameter sections maintain structural integrity during conveyance and operation.
4Measurement precision
If expanded diameter sections are added for alignment, then centralization is improved, but the device complexity increases
Solution Approach 1:
The alignment function is merged into the charge tube structure itself through the expanded diameter sections, eliminating the need for separate external alignment mechanisms. The geometric expansion of the tube body provides the centralization function that would otherwise require additional components.
Solution Approach 2:
The diameter parameter of the charge tube is changed in specific sections to create expanded diameter regions. This parameter change provides the mechanical means for alignment and centralization within the outer housing without requiring complex adjustment mechanisms or additional alignment components.
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 solution enhances the efficiency and reliability of perforating tools by ensuring proper alignment, secure housing, and efficient debris disposal, improving fluid communication between the wellbore and formation.
Implementation Method 1
each perforating gun comprises one or more shaped explosive charges
Implementation Method 2
fired to perforate the casing
Implementation Method 3
a stress riser extending through the charge tube
Data Source
AI summary
A charge tube for use with a perforating tool that includes a tubular member having a first end, a second end, an outer surface, and a passage extending between the first end and the second end, and a receptacle extending through the outer surface of the tubular member for receiving a shaped charge, wherein the tubular member includes a reduced diameter section, and a first expanded diameter section disposed at the first end of the tubular member, the first expanded diameter section having a greater diameter than the reduced diameter section, and wherein the reduced diameter section and the first expanded diameter section of the tubular member are monolithically formed.