Bridged Bulkhead Assembly for Perforating Gun Signal Isolation
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Solution Overview
Problem
Existing perforating gun assemblies face challenges in maintaining reliable electrical connections and sealing wellbore fluids and debris, particularly after detonation of explosive charges, which can damage the electronics within the tandem sub and addressable switch.
Innovation Solution
A bridged bulkhead assembly is introduced, comprising a first and second bulkhead with signal transmission and detonator pins, respectively, connected by a bridge, and integrated into a carrier end plate to secure and isolate the addressable switch from wellbore fluids and pressure waves, ensuring reliable signal transmission and protection of electronics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the addressable switch and electronics are exposed to the wellbore environment, then the device complexity is reduced, but the reliability deteriorates due to damage from detonation pressure waves and wellbore fluids
Solution Approach 1:
The addressable switch and electronics are nested within the tandem sub, which is positioned within the perforating gun assembly. This nested configuration allows the electronics to be protected from wellbore fluids and detonation pressure waves while maintaining a compact device structure and reducing overall complexity.
Solution Approach 2:
The tandem sub acts as an intermediary component between the explosive charges and the addressable switch. It provides a protective barrier that isolates the electronics from harmful wellbore fluids and pressure waves generated during detonation, while still allowing electrical signals to be transmitted to and from the switch.
2Reliability
If the electronics are protected from wellbore fluids and pressure waves, then the reliability is improved, but the device complexity increases due to additional sealing and isolation requirements
Solution Approach 1:
By nesting the electronics within the tandem sub and positioning the tandem sub within the perforating gun assembly, the design achieves protection from wellbore fluids and pressure waves without requiring separate, complex sealing systems. The nested structure itself provides the necessary isolation barrier.
Solution Approach 2:
The tandem sub serves multiple functions simultaneously: it acts as a protective barrier against wellbore fluids and pressure waves, provides a mounting structure for the addressable switch, and maintains electrical connectivity. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
3Reliability
If the bulkhead assembly is designed to seal and isolate the addressable switch, then the reliability is improved, but the ease of manufacture deteriorates due to additional assembly steps and sealing requirements
Solution Approach 1:
The nested configuration of the addressable switch within the tandem sub, which is itself nested within the perforating gun assembly, allows the sealing and isolation functions to be integrated into the existing assembly structure. This reduces the need for separate sealing components and simplifies the manufacturing process compared to adding independent sealing systems.
Data Source
AI summary
Bridged bulkheads for a perforating gun assembly. The bridged bulkheads comprise a first bulkhead, a signal transmission pin residing within the first bulkhead, a second bulkhead, a detonator pin residing within the second bulkhead, and a bridge fixedly connecting and spacing apart the first bulkhead and the second bulkhead. Each of the bulkheads is fabricated from an electrically non-conductive material, while each of the pins is an electrically conductive pin. The bridge comprises a body connected to the first and second bulkheads. A signal transmission wire is connected to the signal transmission pin at the first end of the first bulkhead. At the same time, a detonator wire is connected to the detonator pin at the first end of the second bulkhead. The first bulkhead is over-molded to hold the signal transmission wire, while the second bulkhead is over-molded to securely hold the detonator wire.