Logging Tool Sensor Shield Assembly Design
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Solution Overview
Problem
Existing shield assemblies for electromagnetic logging tools lack structural integrity and are prone to loosening during drilling operations, leading to compromised electromagnetic measurements and potential loss of tool parts.
Innovation Solution
A shield assembly with a single-piece cylindrical design secured by axially opposed end clamps with integral keys and pockets, providing enhanced resistance to bending, torsion, and fluid ingress, and maintaining a stable electromagnetic window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional shield assemblies are used for electromagnetic logging tools, then the shields provide basic protection for antennas and sensors, but the shields lack structural integrity and are prone to loosening during drilling operations
Solution Approach 1:
The shield assembly is divided into multiple components: a cylindrical shield body, axially opposed end clamps, and integral keys with corresponding pockets. This segmentation allows each component to be optimized for its specific function while working together to provide enhanced overall structural integrity and resistance to drilling-related loads.
Solution Approach 2:
The shield assembly combines different materials and structural elements - the cylindrical shield, end clamps, and key-pocket engagement mechanisms - creating a composite structure that provides superior strength and rigidity compared to traditional single-piece shields, while maintaining electromagnetic signal transparency.
2Reliability
If traditional shield mounting designs are used, then the shields can be installed on logging tools, but the shields loosen during drilling operations leading to potential loss of tool parts
Solution Approach 1:
The end clamps are designed with integral keys that engage with corresponding pockets on the shield body before drilling operations begin. This preliminary mechanical engagement prevents any relative motion between components during subsequent drilling operations, eliminating the loosening problem associated with traditional mounting designs.
Solution Approach 2:
The key-pocket engagement mechanism acts as an intermediary element between the end clamps and the cylindrical shield body, providing a positive mechanical lock that prevents relative axial and rotational motion. This intermediary connection ensures stable mounting without requiring complex fastening systems.
3Reliability
If traditional shield designs are used, then the shields provide basic protection, but they offer insufficient resistance to fluid ingress during drilling operations
Solution Approach 1:
The shield assembly is segmented into the cylindrical shield body and end clamps that can be independently positioned and secured. This segmentation allows for precise alignment and sealing at the interfaces between components, creating multiple barriers against drilling fluid ingress while maintaining electromagnetic signal transparency through the segmented structure.
Data Source
Figure 1
Figure 2A~2B
Figure 3~5B
AI summary
A shield assembly for logging tool sensors includes a single piece cylindrical shield and first and second cylindrical end clamps deployed about opposing axial ends of the cylindrical shield. The cylindrical shield is deployed about a logging sensor disposed on a logging tool collar. At least one of the first and second end clamps includes one or more keys for engaging a corresponding slot in the shield and a corresponding pocket in an outer surface of the tool collar. Engagement of the key with the corresponding slot and the corresponding pocket is operative to prevent relative rotational and relative axial motion between the cylindrical shield, the first and second end clamps, and the tool collar.