Direct Connect Sub for Perforating Gun Assembly
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Solution Overview
Problem
Current perforating gun assemblies for subterranean wells require multiple components and connections, leading to complexity and potential fluid leaks, especially during and after explosive charge initiation, which complicates depth measurement and electrical connectivity.
Innovation Solution
A direct connect sub with a single body featuring dual sets of threads for secure engagement with both the casing collar locator and perforating gun body, along with an integrated electrical contact assembly that provides a bulkhead seal and reduces the number of components needed, enhancing fluid integrity and electrical connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple threaded connecting subs and quick change adapters are used to attach perforating guns to tool strings, then the assembly can be flexible and adaptable to different configurations, but the device complexity increases and potential fluid leaks occur
Solution Approach 1:
The patent combines multiple separate components (threaded connecting sub, quick change adapter, electrical contact assembly, and bulkhead seal) into a single integrated direct connect sub. This merging eliminates the need for multiple separate connections while maintaining the functional capabilities of each component, thereby reducing device complexity and potential leak paths while preserving assembly flexibility.
Solution Approach 2:
The direct connect sub is designed to perform multiple functions simultaneously: it provides mechanical connection (replacing threaded subs), enables quick changes (replacing quick change adapters), ensures fluid sealing (replacing bulkhead seals), and maintains electrical connectivity (replacing electrical contact assemblies). This multi-functionality reduces the number of components needed while maintaining adaptability.
2Adaptability or versatility
If multiple connections and components are used in the perforating gun assembly, then the assembly can accommodate various configurations, but the reliability decreases due to potential fluid leaks during and after explosive charge initiation
Solution Approach 1:
The patent integrates the bulkhead seal functionality directly into the direct connect sub body, creating a single-point seal location rather than multiple separate seal points. This consolidation eliminates potential leak paths at connection interfaces between multiple components, thereby improving fluid seal integrity while maintaining configuration options.
Solution Approach 2:
The patent addresses the harmful effect of potential fluid leaks by incorporating a robust bulkhead seal design that actively prevents leakage during explosive charge initiation. The seal is positioned to withstand the high-pressure environment, converting the potential harm of explosive forces into a controlled sealing mechanism that maintains fluid integrity.
3Adaptability or versatility
If multiple components and connections are used, then the assembly can be adaptable, but the ease of operation decreases due to complicated depth measurement and electrical connectivity issues
Solution Approach 1:
The patent combines the electrical contact assembly directly into the direct connect sub body, eliminating the need for separate electrical connections at each interface. This integration simplifies depth measurement and electrical connectivity by providing a single, reliable contact point, thereby improving ease of operation while maintaining assembly adaptability.
4Adaptability or versatility
If multiple threaded connecting subs and adapters are used, then the assembly can be flexible, but the ease of manufacture decreases due to increased assembly steps
Solution Approach 1:
The patent consolidates multiple manufacturing steps and assembly operations into a single integrated component. The direct connect sub is manufactured as one piece containing all necessary functional elements, eliminating the need for field assembly of multiple separate components. This significantly improves ease of manufacture while preserving the flexibility needed for different well configurations.
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
Simplifies the assembly by reducing the number of components and connections, ensuring a reliable fluid seal and electrical connection, thereby improving the operational efficiency and safety of perforating gun operations.
Implementation Method 1
a biasing member disposed within the bore of the housing. The biasing member extends between the contact pin and the plug and electrically couples the contact pin to the plug
Implementation Method 2
a first set of threads disposed proximate the first end that are configured to threadably engage with the CCL. Further, the direct connect sub includes a second set of threads disposed proximate the second end that are configured to threadably engage with the perforating gun body
Data Source
AI summary
A perforating gun assembly includes a perforating gun body, a casing collar locator, and a direct connect sub coupled to the CCL and the perforating gun body. In an embodiment, the direct connect sub includes a single body including a central axis, a first end, and a second end. The first end is engaged with the CCL, and the second end is engaged with the perforating gun body.