Lateral Isolator with Segmented Elastomeric Packages
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Solution Overview
Problem
Existing vibration isolation systems for downhole operations are inadequate in protecting sensitive electronics from both repetitive vibrations and shock vibrations, leading to potential damage and interference with device operation.
Innovation Solution
A lateral isolator is designed with a housing, an inner member with a pivot ring, and elastomeric packages positioned between the housing and the inner member. The isolator includes compliant fins for additional frequency response and maintains a pressure-independent pressure column, allowing for effective isolation of lateral forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single elastomeric package is used for vibration isolation, then the structure is simple, but it cannot effectively respond to multiple frequency ranges of vibrations and shocks
Solution Approach 1:
The isolator is divided into multiple independent elastomeric packages (first, second, and third packages) positioned at different locations. Each package is tuned to respond to specific frequency ranges, allowing the system to handle multiple vibration frequencies simultaneously while maintaining a relatively simple overall structure.
Solution Approach 2:
Each elastomeric package has different physical properties and is positioned at specific locations within the isolator. The first package responds to lower frequencies, the second to mid-range frequencies, and the third to higher frequencies. This local differentiation allows each component to optimize its performance for its designated frequency range.
2Reliability
If rigid structural components are used, then the device maintains structural integrity, but it transmits shock and vibration forces to the electronics
Solution Approach 1:
The isolator uses elastomeric packages as flexible elements to replace rigid structural components in the load path between the inner member and housing. These elastomeric elements provide both flexibility for vibration isolation and sufficient strength to maintain structural integrity, protecting electronics from shock and vibration while supporting mechanical loads.
Solution Approach 2:
The isolator combines elastomeric materials with rigid structural components (housing, inner member, pivot ring) to create a composite system. The elastomeric packages absorb and isolate vibrations, while the rigid components maintain structural integrity and geometric stability, achieving both protection and strength simultaneously.
3Reliability
If the isolator responds to all frequency ranges with a single component, then the structure is simple, but the response to specific frequency ranges is not optimized
Solution Approach 1:
The vibration isolation function is segmented into multiple frequency-specific packages. The first elastomeric package is optimized for lower frequency vibrations, the second for mid-range frequencies, and the third for higher frequency shocks. This segmentation allows each package to be independently tuned and optimized for its specific frequency range.
Solution Approach 2:
Rather than using a single component that attempts to handle all frequencies equally (excessive action), the system uses multiple packages where each handles only the frequency range it is optimized for (partial action). This approach provides superior overall performance by concentrating design optimization on specific frequency bands.
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
The lateral isolator effectively mitigates lateral shock and vibration, preventing damage to sensitive electronics and maintaining the orientation and directionality of MWD/LWD tools, thereby enhancing the longevity and reliability of downhole equipment.
Implementation Method 1
a first elastomeric package disposed between the housing and the inner member... and a second elastomeric package disposed between the housing and the inner member
Implementation Method 2
when a first compliant fin of the compliant fins is radially compressed, an area of an outer face of the compliant fin, which is in contact with a structure in which the lateral isolator is positioned increases to provide a nonlinear stiffening force
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A lateral isolator (200) has a tubular body with an upstream end and a downstream end. The lateral isolator (200) also includes an inner member (210) having a pivot ring (220) disposed within the tubular body. A first elastomeric package (236) is disposed between the tubular body and the inner member (210) longitudinally between the pivot ring (220) and the upstream end. A second elastomeric package (236) is disposed between the tubular body and the inner member (210) longitudinally between the pivot ring (220) and the downstream end.