High Temperature Initiator Using BAX and PYX
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Solution Overview
Problem
Current explosive initiators used in oil and gas industry perforating gun assemblies are unable to withstand high temperatures for extended periods, and materials like lead azide and silver azide pose environmental and safety risks due to their volatility and toxicity.
Innovation Solution
A device and method utilizing a combination of barium 5-nitriminotetrazolate (BAX) as a primary explosive and 2,6-Bis(picrylamino)-3,5-dinitropyridine (PYX) or Hexanitrostilbene (HNS) as a secondary explosive, configured in multiple layers within a percussion initiator, allowing for high temperature applications without compromising initiation ability and reducing toxicity risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lead azide or silver azide are used as primary explosive in initiators, then initiation effectiveness is maintained, but the initiator cannot withstand high temperatures for extended periods and environmental safety risks increase
Solution Approach 1:
The patent changes the chemical composition parameters by replacing lead azide and silver azide with barium 5-nitriminotetrazolate (BAX) as the primary explosive. This parameter change enables the initiator to withstand temperatures up to 290°C for several hours and 250°C for extended periods while maintaining initiation effectiveness, directly resolving the temperature resistance contradiction.
Solution Approach 2:
The patent employs a composite explosive system consisting of BAX as primary explosive combined with secondary explosives (HNS or PYX). This composite material approach maintains the initiation effectiveness required for reliable perforating gun operation while the BAX component provides superior thermal stability compared to traditional lead azide or silver azide formulations.
2Reliability
If lead azide or silver azide are used as primary explosive, then initiation capability is achieved, but toxicity and environmental harm increase
Solution Approach 1:
The patent extracts and removes the harmful lead and silver azide components from the initiator formulation. By eliminating these toxic primary explosives and replacing them with BAX, the invention removes the source of environmental contamination and worker exposure risks while preserving the essential initiation capability through BAX's explosive properties.
Solution Approach 2:
The patent converts the previously harmful lead azide and silver azide materials into beneficial alternatives by using BAX, which provides comparable or superior initiation performance without the toxicological and environmental disadvantages. This substitution transforms the harmful chemical composition into a safe and environmentally friendly formulation.
3Temperature
If PYX is used as explosive material, then thermal stability is improved, but initiation sensitivity decreases
Solution Approach 1:
The patent segments the explosive system into distinct functional layers: BAX as the primary explosive layer responsible for initiation sensitivity, and PYX as the secondary explosive layer providing thermal stability and energy amplification. This segmentation allows each material to perform its optimized function without compromising the other's properties.
Solution Approach 2:
The patent uses BAX as an intermediary explosive that bridges the gap between the initiation source and the thermally stable PYX secondary explosive. BAX's moderate sensitivity allows it to be reliably initiated while its decomposition products and energy release effectively trigger the less sensitive but thermally stable PYX, thereby mediating between initiation requirements and thermal stability requirements.
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 initiator maintains effective detonation performance at temperatures up to 290°C for several hours and 250°C for extended periods, with minimal reduction in velocity of detonation, while reducing the risks associated with the use and manufacture of the materials.
Implementation Method 1
barium 5-nitriminotetrazolate (BAX) as a primary explosive... capable of withstanding high temperature applications for extended periods of time
Implementation Method 2
maintains effective detonation performance at temperatures up to 290°C for several hours and 250°C for extended periods, with minimal reduction in velocity of detonation
Data Source
AI summary
According to an aspect, the present embodiments may be associated with a device and method of using an initiator including a body configured for receiving at least one explosive including barium 5-nitriminotetrazolate (BAX). According to a further aspect, the body of the initiator is configured for receiving at least two layers of explosive. In this embodiment, the layers of explosive include a primary explosive of the barium 5-nitriminotetrazolate (BAX) and a secondary explosive includes 2,6-Bis(picrylamino)-3,5-dinitropyridine (PYX) and/or Hexanitrostilbene (HNS).