Mandrel Loading Systems Axial Load Distribution
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Solution Overview
Problem
Downhole tools face challenges in managing axial shock, vibration, and thermal expansion due to the lack of effective axial load distribution across mandrel subassemblies, which can lead to reduced functionality and reliability in drilling operations.
Innovation Solution
The implementation of multiple axial load devices (ALDs) within a chassis of a field connection segment to absorb axial loads, allowing for distributed compression and improved torque application to seal faces, enhancing the robustness of connections and reducing the size and torque requirements of individual ALDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single axial load device is used to compress the mandrel subassembly, then the axial load is concentrated on one device, but this increases the size and torque requirements of the individual ALD
Solution Approach 1:
The patent divides the single axial load function into multiple axial load devices (first ALD and second ALD) positioned at different locations along the mandrel subassembly. Each ALD compresses a separate portion of the mandrel, segmenting the total axial load into multiple smaller loads that each device can handle with reduced size and torque requirements.
2Force
If a single axial load device is used, then the structure is simpler, but the torque application to seal faces is insufficient
Solution Approach 1:
The patent positions multiple axial load devices at different locations along the mandrel subassembly, with each ALD applying compressive force to its respective seal face. This segmentation of the torque application function allows each ALD to be optimized for its specific location, improving overall sealing effectiveness without requiring one excessively complex device.
3Reliability
If axial load is not distributed, then the structure is simpler, but the tool functionality is reduced under stress conditions
Solution Approach 1:
The patent implements multiple axial load devices that independently compress different portions of the mandrel subassembly, distributing the axial load throughout the structure. This segmentation approach enhances reliability under stress conditions by preventing localized failure, as each ALD protects its specific section of the mandrel and associated seal faces.
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
This solution effectively distributes axial loads across multiple ALDs, reducing the size and torque needed for each, thereby improving the integrity of seal faces and maintaining tool functionality under stress conditions.
Implementation Method 1
the drill string may be subjected to axial shock, vibration, and thermal expansion. To minimize these effects, the modules may be loaded in compression with an axial load device (ALD) in the collar.
Implementation Method 2
the drill string may be subjected to axial shock, vibration, and thermal expansion
Data Source
AI summary
A downhole tool includes first and second collars, each including a chassis portion. A first axial load device is disposed in the first collar to exert axial force on the respective chassis portion disposed in the first collar. A second axial load device is disposed in the second collar to exert axial force on the respective chassis portion disposed in the second collar. A collar connector is coupled to the first and second collars and compresses the first axial load device.