Tandem Sub Electrical Connection for Perforating Gun Reliability
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Solution Overview
Problem
Perforating guns for downhole deployment face challenges in manufacturing, assembly, deployment, and operation due to harsh conditions, particularly in maintaining electrical and structural connections.
Innovation Solution
A perforating gun design featuring a gun housing with a central portion, top and bottom subs, and a tandem sub with an electrical connection system that includes a bulkhead assembly, printed circuit board (PCB) assembly, and a detonator, which provides secure and robust electrical connections through a sliding connection and grounding system to ensure reliable detonation of shaped charges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical components and connections are maintained throughout the operational lifecycle of the perforating gun, then the reliability of detonation is improved, but the complexity of maintaining connections under harsh conditions increases
Solution Approach 1:
The electrical connection system is divided into separate functional modules: a bulkhead assembly for structural support and electrical connections, a PCB assembly for signal processing, and a detonator assembly for initiating the charge. This segmentation allows each component to be optimized independently and simplifies maintenance by isolating potential failure points.
Solution Approach 2:
The bulkhead assembly serves as an intermediary component between the external environment and the electrical components. It provides a protected interface that maintains electrical connections while shielding the sensitive electronics from harsh downhole conditions, thereby maintaining reliability without requiring direct exposure of components to the environment.
2Stability of the object's composition
If structural and mechanical connections are maintained throughout the operational lifecycle, then the stability of the perforating gun is improved, but the difficulty of maintaining connections under harsh conditions increases
Solution Approach 1:
The bulkhead assembly merges structural support functions with electrical connection functions into a single integrated component. This consolidation provides both mechanical stability and electrical connectivity simultaneously, reducing the number of separate connections that need to be maintained under harsh conditions.
Solution Approach 2:
The bulkhead assembly is designed to absorb and cushion the effects of harsh downhole conditions before they can affect the sensitive electrical components. The robust structure provides beforehand protection against pressure fluctuations, temperature extremes, and mechanical stresses, thereby maintaining stability without requiring complex active compensation systems.
3Reliability
If electrical connections are protected from shocks and forces, then the reliability of electrical components is improved, but the complexity of the protection system increases
Solution Approach 1:
The bulkhead assembly incorporates protective shielding that acts as a flexible barrier between electrical components and external shocks or forces. This protective shell approach provides simple yet effective protection without requiring complex active damping or isolation systems, maintaining component reliability while minimizing added complexity.
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 reliability and performance of perforating guns by maintaining electrical connections under harsh conditions, ensuring precise detonation and improved modularity, while protecting electrical components from shocks and forces.
Implementation Method 1
the bulkhead is secured within the bore via interference fit
Data Source
AI summary
An electrical connection system for providing an electrical signal to a detonator of a perforating gun is provided. The system includes a tandem sub operatively coupled to a gun housing and having a sub body having a bore defined therethrough, a bulkhead assembly having a bulkhead electrical connector securable within the bore, and a printed circuit board assembly. The PCB assembly includes a cartridge having a connection bore adapted to receive the bulkhead electrical connector and define a sliding connection between the cartridge and the bulkhead assembly, and an addressable switch located within the cartridge body and in electrical communication with the bulkhead electrical connector. The detonator is located within the cartridge body and is in electrical communication with the addressable switch. The bore, the bulkhead electrical connector, the cartridge and the detonator are concentrically disposed relative to one another and extend along a common axis.