Downhole Electronics Protective Housing with Shock Isolation
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Solution Overview
Problem
Downhole electronics and sensors face reliability issues due to extreme vibrations, shocks, and high pressures in drilling environments, leading to frequent failures, and existing protective methods either degrade vibration performance or shock isolation, while also being costly and difficult to maintain.
Innovation Solution
A downhole protective housing with a chassis of elongate side rails and arcuate armatures that provide optimal strength, rigidity, and heat dissipation, using a compliant sleeve for secure fit and shock isolation, allowing for efficient heat transfer and reuse of components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing protective methods are used to protect downhole electronics from extreme vibrations and shocks, then reliability improves, but vibration transmissibility degrades or shock isolation performance worsens
Solution Approach 1:
The protective housing is divided into multiple segments including a pressure housing, vibration isolation housing, and shock isolation housing. Each segment addresses specific environmental threats independently, allowing the electronics to be protected from vibrations and shocks without compromising overall reliability while maintaining appropriate transmissibility characteristics.
Solution Approach 2:
A compliant member is introduced as an intermediary element between the shock isolation housing and the vibration isolation housing. This compliant member provides shock isolation while maintaining vibration transmissibility near 1, resolving the contradiction between protecting from shocks and maintaining vibration performance.
2Object-affected harmful factors
If pressure housing is used to shield electronics from downhole pressures, then protection from pressure improves, but heat dissipation capability deteriorates
Solution Approach 1:
A heat transfer member is introduced as an intermediary between the electronics and the pressure housing. This heat transfer member conducts heat away from the electronics while the pressure housing maintains pressure protection, resolving the contradiction between pressure shielding and heat dissipation.
Solution Approach 2:
The protective housing system uses composite construction with different materials optimized for specific functions: pressure-resistant materials for the pressure housing and thermally conductive materials for heat dissipation paths, allowing simultaneous achievement of pressure protection and thermal management.
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 solution effectively protects downhole electronics from extreme conditions, maintaining vibration transmissibility near 1 and providing shock isolation, while allowing for efficient heat dissipation and easy maintenance, reducing the risk of component failure and operational costs.
Implementation Method 1
A heat transfer member is positioned between the circuit board and the armature and chassis to facilitate heat dissipation
Implementation Method 2
A compliant sleeve is configured to fit over an exterior surface of the two arcuate armatures and secure the protective housing within the collar
Data Source
AI summary
Aspects of the subject technology relate to a downhole protective housing for electronic components including a circuit board. The protective housing can include a chassis comprising two elongate side rails, a circuit board located between the pair of elongate side rails, an armature fixedly coupled to the chassis, a buffer coupled to the circuit board. The protective housing can further include a substantially cylindrical intermediate sleeve, a substantially cylindrical outer case, and a pair of end caps, one each located at opposite distal ends of the protective housing.