Downhole Tool Sensor Guard Axial Mounting
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Solution Overview
Problem
Existing downhole tool guards are prone to mechanical loading issues, leading to shear stress and potential damage due to non-preferred loading directions of fasteners, which can result in guard failure and antenna damage, and lack removability for antenna replacement and configuration changes.
Innovation Solution
The development of axially mounted removable guards with a locking element and fastener system that loads along the preferred axis, providing pretension and reducing shear and bending stresses, allowing for easy replacement and multiple antenna configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixedly connected covers are used to protect antennas, then protection reliability is improved, but mechanical stress and susceptibility to breaking increase
Solution Approach 1:
The guard is divided into multiple segments that can be independently mounted and removed. Each segment is connected to the tool body through separate mounting systems with locking elements, allowing the guard to be segmented into removable portions rather than a single fixed structure. This segmentation reduces the mechanical stress concentration that would occur in a monolithic fixed connection.
Solution Approach 2:
The mounting system incorporates locking elements that can be engaged and disengaged, transforming the static fixed connection into a dynamic removable connection. The locking elements include features such as locking tabs, springs, or threaded mechanisms that allow the guard to be securely mounted during operation and easily removed when needed, providing both protection and adaptability.
2Stability of the object's composition
If fixedly connected covers are used to protect antennas, then structural stability is improved, but adaptability for antenna replacement decreases
Solution Approach 1:
The mounting system uses locking elements with engagement features that provide stable structural support during operation while allowing easy disengagement for antenna replacement. The locking mechanism may include springs, threads, or cam-actuated features that maintain stable connection under downhole conditions but can be quickly released when needed.
Solution Approach 2:
The guard design allows the antenna to be removed and replaced while the guard structure itself remains in place. The locking elements enable the antenna to be discarded (removed) and a new antenna to be installed, recovering the use of the existing guard structure without needing to replace the entire assembly.
3Device complexity
If non-preferred loading directions of fasteners are used, then device complexity is reduced, but mechanical stress and potential damage increase
Solution Approach 1:
The mounting system reorients the fastener loading direction from radial or tangential to axial, aligning the load with the strongest axis of the fastener and reducing shear stress. This is achieved through locking elements that engage in the axial direction, such as threaded fasteners or cam-actuated locking mechanisms, transforming the loading condition without significantly increasing complexity.
4Adaptability or versatility
If removable guards with axial mounting are used, then adaptability for antenna replacement is improved, but device complexity increases
Solution Approach 1:
The mounting system is segmented into modular components including locking elements, fasteners, and mounting brackets that can be independently manufactured and assembled. This modular segmentation allows for easier manufacturing and assembly while providing the required adaptability for antenna replacement.
Solution Approach 2:
The locking elements incorporate simple engagement mechanisms such as spring-loaded tabs, threaded connections, or cam-actuated locks that provide secure mounting with minimal complexity. These mechanisms transform the static connection into a dynamic removable one using well-understood mechanical principles that do not significantly increase overall system complexity.
Data Source
AI summary
A system for covering a sensitive component in a downhole string includes a sub section in the downhole string including a longitudinal axis and a reduced diameter portion along the longitudinal axis. The system also includes a guard element, arranged over the reduced diameter portion. The system further includes a mounting system adapted to axially couple the guard element to the sub section. The mounting system includes a pocket in one of the sub section and the guard element, the pocket including a shoulder. The mounting system also includes a threaded bore in the other of the sub section and the guard element, the threaded bore oriented at least partially parallel to the longitudinal axis of the sub section. The mounting system further includes a fastener engaging the threaded bore through the pocket and axially coupling the guard element to the sub section.