Rotating Control Device Leakage Detection via Pressure Differential
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Solution Overview
Problem
Existing drilling systems face challenges in effectively testing the integrity of rotating control device (RCD) sealing elements during managed pressure drilling (MPD) operations, as failures can jeopardize the operation.
Innovation Solution
Implement a method and system that utilize pressure sensors positioned relative to the RCD sealing element to monitor pressure differentials created by a pressure spike in the wellbore annulus during MPD, allowing for real-time assessment of sealing element integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure sensors are installed to monitor sealing element integrity, then reliability of MPD operations is improved, but device complexity increases
Solution Approach 1:
The pressure monitoring system is segmented into multiple pressure sensors positioned at different locations relative to the sealing element. This segmentation allows the system to monitor pressure differentials across specific zones, enabling detection of leakage paths without requiring a single complex monitoring system. Each sensor is simple in design, but their distributed arrangement provides comprehensive monitoring capability.
Solution Approach 2:
The pressure differential between sensors acts as an intermediary indicator of sealing element integrity. Rather than directly measuring seal performance, the system uses pressure differential as a mediator that reflects sealing conditions. This indirect measurement approach simplifies the monitoring system while maintaining reliable detection capability.
2Measurement precision
If pressure spike is created to test sealing element, then detection precision is improved, but harmful factors increase
Solution Approach 1:
The system applies a controlled pressure spike that is sufficient to reveal leakage conditions but not excessive enough to cause damage. The pressure differential created is just enough to be detected by the sensors and trigger alarm conditions, avoiding harmful effects while maintaining detection precision. The pressure spike is applied temporarily and then released.
Solution Approach 2:
The pressure spike, which could potentially be harmful to the sealing element, is converted into a beneficial diagnostic tool. By strategically applying the pressure spike and monitoring the resulting pressure differential, the system transforms a potentially damaging action into a useful testing mechanism that reveals sealing integrity without causing damage.
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
Enables effective condition monitoring of RCD sealing elements, detecting leaks and potential failures, thereby ensuring the reliability of MPD operations.
Implementation Method 1
monitoring a pressure differential between the plurality of pressure sensors to determine whether there is a leakage within the rotating control device
Implementation Method 2
at least one of the pump and the choke manifold is configured to create a pressure spike in the annulus of the wellbore during a managed pressure drilling operation
Data Source
AI summary
A method includes initiating a managed pressure drilling (MPD) operation in an MPD system including a rotating control device (RCD) including at least one sealing element and a plurality of pressures sensors placed relative to the at least one scaling element. The RCD is positioned in the MPD system so as to receive fluid exiting an annulus of a wellbore. Further, the method includes creating a pressure spike in the annulus of the wellbore during the MPD operation, and monitoring a pressure differential between the plurality of pressure sensors to determine whether there is a leakage within the RCD.