Annular Seal Condition Monitoring in MPD Systems
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Solution Overview
Problem
Current annular sealing systems in Managed Pressure Drilling (MPD) operations, particularly in deepwater and ultra-deepwater applications, lack effective condition monitoring, leading to unpredictable seal failures and increased maintenance costs, which can result in safety risks and operational inefficiencies.
Innovation Solution
Implementing a method for seal condition monitoring in ACD-type annular sealing systems that uses an active control system to adjust closing pressures and detect wear in sealing elements, allowing for proactive replacement and reducing the risk of catastrophic failures by monitoring the condition of sealing elements in real-time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional annular sealing systems are used without condition monitoring, then device complexity is reduced, but reliability deteriorates due to unpredictable seal failures
Solution Approach 1:
The patent replaces complex mechanical monitoring devices with a method that utilizes existing electrical components (pressure transducers, control systems) already present in MPD operations. The monitoring is achieved through electrical signal processing of pressure data rather than additional mechanical sensors, thus improving reliability without significantly increasing mechanical complexity
Solution Approach 2:
The existing active control system and pressure measurement infrastructure in MPD systems is utilized to automatically detect seal wear conditions. The system monitors its own operational parameters (annular pressure, closing pressure requirements) to identify degradation, eliminating the need for separate monitoring hardware and reducing overall system complexity while maintaining high reliability
2Reliability
If real-time seal condition monitoring is implemented, then reliability is improved through early detection of wear, but device complexity increases due to additional monitoring requirements
Solution Approach 1:
The patent makes the existing active control system multi-functional by enabling it to perform both its primary function (controlling wellbore pressure) and the secondary function of monitoring seal condition. The same pressure transducers and control algorithms used for pressure management are repurposed to detect seal wear, eliminating the need for dedicated monitoring hardware and reducing overall system complexity
Solution Approach 2:
The system implements feedback mechanisms where the control system continuously monitors pressure parameters and automatically adjusts or alerts operators when seal wear is detected. The feedback loop uses existing pressure measurement and control infrastructure to provide real-time seal condition information, improving reliability without requiring complex additional monitoring hardware
3Reliability
If proactive seal replacement is performed based on monitoring data, then reliability is maintained, but productivity decreases due to additional maintenance interruptions
Solution Approach 1:
The system enables preliminary detection of seal wear conditions before catastrophic failure occurs. By monitoring pressure parameters and identifying trends indicating seal degradation, the system allows for planned maintenance scheduling during natural operational stoppages or between drilling sections, rather than reacting to sudden failures. This approach maintains reliability while minimizing productivity impact by avoiding unplanned emergency stoppages
Solution Approach 2:
The monitoring system dynamically adjusts maintenance scheduling based on actual seal condition data rather than following fixed preventive maintenance intervals. When seal wear is detected early, maintenance can be scheduled at the next convenient operational stop; when seals are healthy, operations continue without interruption. This dynamic approach optimizes the balance between maintaining seal integrity and maximizing drilling productivity
Data Source
Figure 1A
Figure 1B
Figure 2A~2B
AI summary
A method of seal condition monitoring may determine the state of the annular seal, the state of one or more sealing elements, take actions to maintain the annular seal as one or more sealing elements transition from new to worn, and provide advance notice of the impending failure of one or more sealing elements so as to avoid a catastrophic annular seal failure while the marine riser is pressurized. Advantageously, operations may be conducted proactively rather than reactively, and one or more sealing elements may be replaced well in advance of failure, but potentially later than a conventional maintenance schedule would dictate. The one or more failing sealing elements may be proactively replaced without depressurizing the marine riser, prior to seal failure or replacement may be planned well in advance and coordinated with other rig operations to improve efficiency and maintain the safety of the drilling rig and personnel.