Tandem Sub Rotation Mechanism for Self-Orienting Perforating Guns
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Solution Overview
Problem
Existing perforating gun systems for horizontal wells are inaccurate and cumbersome due to traditional orienting methods, which involve lengthy eccentric weight bars and lock collar tandems, leading to increased tool length and potential human error in assembly.
Innovation Solution
A self-orienting perforating gun system utilizing tandem subs with rotational bearing mechanisms at both ends, allowing charge tube assemblies to rotate freely within the gun body, connected by a feed through bulkhead for electrical continuity and pressure seal, reducing tool length and assembly complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional orienting methods using eccentric weight bars and lock collar tandems are used, then perforating guns can be oriented in horizontal wells, but the tool length increases and assembly complexity increases
Solution Approach 1:
The patent removes the traditional eccentric weight bars and lock collar tandems from the system, replacing them with a self-orienting charge tube assembly that integrates orientation functionality directly into the gun body, thereby reducing overall tool length while maintaining orientation capability
Solution Approach 2:
The charge tube assembly is merged with the gun body such that the charge tube serves dual purposes: holding perforating charges and providing self-orientation through gravitational alignment, eliminating the need for separate orienting components
2Measurement precision
If traditional orienting methods using eccentric weight bars and lock collar tandems are used, then perforating guns can be oriented in horizontal wells, but device complexity and potential for human error increase
Solution Approach 1:
The patent eliminates the complex lock collar tandems and eccentric weight bar assemblies, replacing them with a simplified self-orienting charge tube design that reduces the number of components and assembly steps
Solution Approach 2:
The charge tube assembly automatically orients itself using gravity as it is lowered into the wellbore, eliminating the need for complex mechanical locking mechanisms and reducing assembly complexity while maintaining orientation accuracy
3Length of stationary object
If self-orienting charge tube assembly is used, then tool length is reduced and assembly is simplified, but electrical continuity and pressure seal must be maintained
Solution Approach 1:
The tandem sub is designed with multi-functionality, serving as both a mechanical connector between guns and an electrical conductor, while also providing pressure sealing, thereby maintaining reliability despite reduced tool length
Solution Approach 2:
The feedthrough bulkhead acts as an intermediary component that provides electrical continuity between guns while maintaining pressure seal, allowing the self-orienting design to function without compromising system reliability
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 system provides accurate orientation of perforating guns in horizontal wells without increasing tool length, ensuring efficient assembly and reducing human error, while maintaining electrical connectivity and pressure integrity.
Implementation Method 1
A self-orienting perforating gun system utilizing tandem subs with rotational bearing mechanisms at both ends, allowing charge tube assemblies to rotate freely within the gun body
Data Source
AI summary
A method and apparatus for using a tandem sub to connect one or more perforating gun assemblies, having a rotational mechanism located in both ends of the tandem sub allowing the one or more shaped charges to rotate within the one or more perforating assemblies connected to the tandem sub.