Ballasted Perforating Gun Rail for Controlled Shot Orientation
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Solution Overview
Problem
Existing perforating gun assemblies lack the ability to control the orientation of shots fired into a wellbore, limiting the ability to form perforations in desired directions and potentially causing frac hits.
Innovation Solution
A perforating gun assembly with a rail system and ballast mechanism that allows shaped charges to be oriented at 0°, 90°, 180°, or 270° relative to the wellbore axis, using a bearing connection to rotate the charges into pre-selected orientations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional perforating gun assembly is used without an orienting mechanism, then the device complexity is reduced, but the shots cannot be oriented in pre-selected directions leading to potential frac hits
Solution Approach 1:
The patent employs a ballast mechanism that rotates freely during tool run-in but stabilizes in a predetermined orientation when the tool is stationary. This dynamic-to-static transition enables the system to achieve controlled shot orientation (0°, 90°, 180°, or 270°) relative to the wellbore axis while maintaining operational simplicity.
Solution Approach 2:
The ballast and rail system are pre-configured within the perforating gun assembly before deployment. The ballast's weight distribution and the rail's geometric constraints are designed in advance to automatically orient the shaped charges in the correct direction once the tool stops moving, eliminating the need for complex active control systems during operation.
2Adaptability or versatility
If shaped charges are fixed in a single orientation, then the manufacturing precision is improved, but the adaptability to different wellbore conditions and fracture propagation directions is reduced
Solution Approach 1:
The rail system provides a mechanically constrained path that guides the shaped charges into precise angular positions (0°, 90°, 180°, or 270°) relative to the wellbore axis. This dynamic positioning mechanism allows the same assembly to adapt to different wellbore orientations and fracture propagation requirements without compromising manufacturing precision.
Solution Approach 2:
The perforating gun assembly is designed with a universal rail and ballast system that can accommodate multiple shot orientations (0°, 90°, 180°, or 270°) using the same basic structure. This multi-functional design enables the tool to adapt to various wellbore conditions and fracture propagation directions while maintaining consistent manufacturing precision through standardized components.
3Reliability
If an orienting mechanism with ballast and rail system is added, then the shot orientation control is improved, but the ease of operation is reduced
Solution Approach 1:
The ballast mechanism is designed to self-orient the shaped charges through its own weight and the geometric constraints of the rail system. Once the tool is deployed and stopped, the ballast automatically settles into the correct orientation without requiring external intervention, control systems, or complex operational procedures. This self-service mechanism maintains reliability while minimizing operational 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
Enables controlled orientation of perforations for enhanced fluid communication with the formation, reducing frac hits and improving the efficiency of hydrocarbon recovery.
Implementation Method 1
allowing the weighted body of the ballast to rotate into a downward position
Data Source
AI summary
A perforating gun system. The perforating gun system comprises a gun barrel housing, and a pair of tandem subs threadedly connected to the gun barrel housing at opposing ends. The perforating gun system also includes a rail. The rail defines an elongated frame having a plurality of receptacles, wherein each receptacle is configured to receive a shaped charge. A ballast is connected to each of opposing ends of the rail. Each ballast supports a bearing member which interfaces with a central bore of a respective tandem sub. In this manner, relative rotation is provided between the rail and the first and second tandem subs. A method of orienting shots in a perforating gun assembly is also provided.