Composite End Protectors for Jet Perforating Guns
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Solution Overview
Problem
There is a need to reduce material costs of end protectors for perforating guns with shaped charges while ensuring compliance with governmental safety standards for transportation, as existing metal end caps are costly and not optimized for perforating guns without shaped charges.
Innovation Solution
The use of polymer-based end protectors with integrated metallic components, such as low melting temperature alloys or inserts, that provide a cost-effective solution by meeting safety standards through secure sealing and potential self-venting mechanisms in case of elevated temperatures, allowing for the use of materials like bismuth, lead, tin, zinc, silver, cadmium, or stainless steel with melting temperatures between 150°F and 800°F.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal end caps are used to protect perforating guns during shipment, then safety standards are met, but material costs increase
Solution Approach 1:
The end protector is divided into two distinct components: a polymer body providing structural protection and a separate metallic component (insert or disk) providing the required metallic barrier. This segmentation allows each material to perform its optimal function while reducing overall cost compared to using solid metal throughout.
Solution Approach 2:
The invention uses a composite structure combining polymer and metal materials in a single end protector assembly. The polymer provides lightweight structural protection while the metallic insert provides the required metallic barrier for safety compliance, creating a cost-effective composite solution.
2Reliability
If metal end caps are used for all perforating guns, then safety is ensured, but cost optimization is lost for guns without shaped charges
Solution Approach 1:
The end protector design is made adaptable through optional configuration - the metallic component can be included or excluded based on whether the perforating gun contains shaped charges. This dynamic adaptability allows the same basic polymer structure to serve different application requirements.
Solution Approach 2:
The polymer end protector body serves as a universal base structure that can be used for all perforating guns, while the metallic component is added only when needed for shaped charge protection, creating a multi-functional system that handles both protected and unprotected gun scenarios.
3Ease of manufacture
If polymer materials are used instead of metal, then material costs are reduced, but protective capability may be compromised
Solution Approach 1:
The composite structure combines the cost advantages of polymer with the protective capabilities of metal by integrating a metallic insert or disk into the polymer body, ensuring both cost reduction and maintained protective capability.
Solution Approach 2:
Instead of making the entire end protector from expensive metal, the metallic component is placed only where specifically needed - at the opening blocking location - while the rest of the structure uses cost-effective polymer material, optimizing both cost and protection locally.
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 polymer-based end protectors effectively reduce material costs while ensuring safety compliance by providing secure sealing and potential self-venting to prevent pressure buildup during transportation, meeting regulatory requirements with improved safety performance.
Implementation Method 1
a metallic component or a metallic compound component coupled to the polymer securing mechanism and sized to block an opening of an end of the perforating gun for protecting internal components of the perforating gun from external contaminants
Implementation Method 2
a polymer securing mechanism configured to be in contact with a circumferential wall of a perforating gun
Implementation Method 3
low melting temperature alloys or inserts, that provide a cost-effective solution by meeting safety standards through secure sealing and potential self-venting mechanisms in case of elevated temperatures
Implementation Method 4
metallic component or a metallic compound component comprising an eutectic alloy or low temperature melting metal, the metallic component or metallic compound component having a melting point in a range of between 150°F and 800°F
Data Source
AI summary
Perforating gun end protectors including pin end protectors and box end protectors include both a polymer component and a metal component. The pin end protectors and box end protectors herein meet packaging and shipping regulations for shipping perforating gun protectors having charges installed. The pin end protectors and box end protectors of the disclosure are less costly, reduces overall weight, and provide additional safety benefits as compared to traditional metal pin end protectors and metal box end protectors. The polymer component is configured to melt in a deflagration situation thereby venting of the perforating gun to prevent pressure build-up.