Embedded Sensor Seals for Blowout Preventer Condition Monitoring
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Solution Overview
Problem
Wellhead assembly seals in oilfield components, such as blowout preventers, often fail due to age, material degradation, and operational stresses, leading to unplanned downtime and costly replacements, as traditional seals lack the ability to monitor their condition or report operating conditions.
Innovation Solution
Embedding sensors, such as fiber-optic sensors and strain gauges, within elastomeric seals to measure temperature, pressure, stress, and strain, enabling condition-based monitoring and predictive maintenance by acquiring and analyzing data on seal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional seals are used without sensors, then the seal structure remains simple and cost-effective, but the ability to monitor seal condition and predict failures is lost
Solution Approach 1:
The sensor is embedded within the seal structure, with the sensor housing integrated into the seal body. The sensor becomes a nested component inside the seal, allowing condition monitoring without adding external complexity to the overall seal assembly
Solution Approach 2:
The sensor and seal are combined into a single integrated component. The sensor housing is formed as part of the seal structure, merging the monitoring function with the sealing function into one unified component that performs both roles
2Reliability
If seals are replaced on a regularly scheduled basis, then seal reliability is maintained, but unplanned downtime and costs are incurred due to premature replacement
Solution Approach 1:
The sensor provides continuous feedback on seal condition parameters such as temperature, pressure, and strain. This real-time feedback enables monitoring of actual seal health status, allowing maintenance to be scheduled based on actual condition rather than fixed time intervals, thereby preventing premature replacement and reducing unplanned downtime
Solution Approach 2:
The sensor detects potential seal failures before they occur by monitoring condition parameters and identifying degradation trends. This preliminary detection allows maintenance to be performed proactively before actual failure happens, preventing unplanned downtime and enabling better scheduling of maintenance activities
3Loss of information
If sensors are embedded in seals, then condition-based monitoring is enabled, but manufacturing complexity and cost increase
Solution Approach 1:
The sensor is nested within the seal structure during the molding process. The sensor housing is formed as an integral part of the seal body through co-molding or insert molding techniques, which allows the sensor to be embedded without requiring separate assembly steps, thereby minimizing impact on manufacturing ease
Solution Approach 2:
The seal structure is designed to serve multiple functions: providing sealing, structural support, and sensor housing. This multi-functionality reduces the need for additional components and assembly steps, offsetting the increased manufacturing complexity by consolidating functions into a single component
4Quantity of substance
If seals are replaced after failure, then costs are reduced compared to preventive replacement, but unplanned downtime increases
Solution Approach 1:
The sensor provides continuous feedback on seal condition, enabling real-time monitoring of degradation. This allows maintenance to be scheduled optimally - not too early (avoiding premature replacement costs) and not too late (avoiding failure and unplanned downtime), thereby balancing maintenance cost and downtime
Solution Approach 2:
The sensor detects early signs of seal degradation and potential failure modes before actual failure occurs. This preliminary detection enables planned maintenance interventions at the optimal time, preventing catastrophic failure and unplanned downtime while avoiding unnecessary premature replacements, thus optimizing the balance between maintenance cost and downtime
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
This approach allows for proactive maintenance scheduling, reducing downtime and costs by identifying potential seal failures before they occur, and optimizing the longevity of seals based on actual operating conditions.
Implementation Method 1
Embedding sensors, such as fiber-optic sensors and strain gauges, within elastomeric seals to measure temperature, pressure, stress, and strain
Implementation Method 2
Embedding sensors, such as fiber-optic sensors and strain gauges, within elastomeric seals to measure temperature, pressure, stress, and strain
Data Source
AI summary
An apparatus for monitoring the condition of a seal, such as a seal in a blowout preventer or in another oilfield device, is provided. In one embodiment, the apparatus includes a blowout preventer including a seal and a blowout preventer seal-monitoring system that includes a sensor positioned within a body of the seal and a data analyzer. The data analyzer has a processor and is configured to monitor a condition of the seal through analysis of data received by the data analyzer from the sensor positioned within the body of the seal. Additional systems, devices, and methods are also disclosed.