Segmented Antenna Shield for Wellbore Logging Tools
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Solution Overview
Problem
Antennas in wellbore logging tools are prone to damage from mechanical impacts during drilling operations due to lack of effective protection, leading to increased downtime and repair costs.
Innovation Solution
A removable antenna shield composed of multiple discrete components that can be disassembled for repair and reassembled, coupled to the tool mandrel using fasteners and constraining elements to limit rotational motion and minimize damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid antenna shield is used to protect antennas from mechanical impacts, then the reliability of the antenna is improved, but the ease of repair deteriorates because the entire shield must be replaced when damaged
Solution Approach 1:
The antenna shield is divided into multiple discrete segments that can be independently removed and replaced. Each segment is secured to the mandrel with individual fasteners, allowing damaged portions to be replaced without replacing the entire shield structure, thus improving ease of repair while maintaining protective functionality.
Solution Approach 2:
The segmented shield design allows only the damaged segments to be discarded and replaced, while the intact segments are recovered and reused. This reduces waste and repair costs compared to replacing the entire shield assembly.
2Device complexity
If the antenna shield is made as a single integrated component, then the device complexity is reduced, but the loss of time increases due to complete shield replacement during maintenance
Solution Approach 1:
The shield is segmented into multiple independently replaceable sections, each with its own fastening mechanism. This allows maintenance personnel to quickly remove and replace only the necessary segments during maintenance operations, significantly reducing downtime compared to replacing an entire integrated shield.
Solution Approach 2:
The shield segments are pre-configured with attachment features and fasteners that enable quick connection and disconnection. This preliminary preparation of modular components with standardized interfaces allows for rapid maintenance operations without requiring complex assembly procedures.
3Ease of repair
If the antenna shield is designed as a removable multi-component structure, then the ease of repair is improved, but the device complexity increases
Solution Approach 1:
The shield is divided into discrete segments with standardized attachment mechanisms. While this increases the number of components, each segment is designed to be simple and self-contained with uniform fastening features, making the overall assembly easier to repair despite the increased component count.
Solution Approach 2:
The segments are designed with universal attachment features and standardized interfaces that can be used across different shield configurations. This multi-functionality reduces the complexity of individual components while enabling flexible assembly and repair operations.
Data Source
AI summary
A logging tool includes a tool mandrel, an antenna disposed on the tool mandrel and including one or more coil windings wrapped about the tool mandrel, an antenna shield disposed about the antenna and including at least two pieces, and a constraining element to limit rotational motion of the antenna shield about the tool mandrel. The constraining element is disposed in a through hole defined in the antenna shield and a cavity defined in the tool mandrel, and the antenna shield and the tool mandrel are coupled to each other via an interference fit between the constraining element and the through hole and the cavity.