RCD Bearing Assembly Seal for Variable Housing Diameters
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Solution Overview
Problem
Existing rotating control devices (RCDs) face issues with seals that are not compatible with varying housing diameters, leading to ineffective sealing during drilling operations.
Innovation Solution
A rotating control device (RCD) with a bearing assembly that includes a bearing body, bearing housing, load ring, seal, and landing adapter, where the landing adapter's tapered outer shoulder lands on the RCD housing's tapered inner shoulder, and a piston radially compresses the load ring to axially compress the seal, causing it to expand radially and prevent fluid leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a seal is positioned in a housing of a specific diameter, then the seal can effectively contain hydrocarbons or other wellbore fluids, but the seal becomes incompatible with housings of different diameters
Solution Approach 1:
The patent employs a compliant seal material that can change its radial dimension in response to axial compression. When the piston applies axial force to the load ring, the load ring transmits this force to the seal, causing it to expand radially to match the housing inner diameter. This dynamic parameter change allows the same seal to adapt to different housing diameters while maintaining effective sealing.
Solution Approach 2:
The seal transitions from a static component to a dynamic one that can adjust its dimensions during operation. The compliant seal material allows the seal to deform and expand radially when actuated by the piston-load ring mechanism, enabling it to accommodate varying housing diameters and maintain sealing effectiveness across different configurations.
2Reliability
If a seal is designed to fit a specific housing diameter, then sealing performance is optimized, but the device complexity increases when multiple seal sizes are required for different housing diameters
Solution Approach 1:
The compliant seal combined with the piston-load ring actuation mechanism creates a universal sealing solution that can function across multiple housing diameters. Instead of requiring different seal designs for different housing sizes, the same seal can adapt to various diameters through radial expansion when actuated, thereby reducing the number of seal variants needed and simplifying the overall device complexity.
3Reliability
If a rigid seal structure is used to maintain sealing integrity, then sealing reliability is improved, but the seal cannot adapt to variations in housing diameter
Solution Approach 1:
The patent utilizes a compliant seal material that can dynamically change its radial parameter in response to applied axial force. This allows the seal to maintain structural integrity for reliable sealing while simultaneously adapting its dimensions to match different housing diameters, resolving the contradiction between rigidity and adaptability.
Solution Approach 2:
The use of compliant seal material represents a composite approach combining the structural integrity needed for sealing reliability with the flexibility required for dimensional adaptation. The material properties enable the seal to deform elastically under axial compression from the load ring, allowing radial expansion to match housing inner diameters while maintaining sealing effectiveness.
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 RCD effectively seals between the bearing housing and RCD housing, preventing fluid flow during drilling operations, even with varying housing diameters, enhancing sealing efficiency.
Implementation Method 1
a piston configured to move radially-inward to contact the tapered upper surface of the load ring, which pushes the load ring downward and causes the load ring to axially-compress the seal
Implementation Method 2
The seal expands radially in response to being axially-compressed to prevent fluid flow between the bearing housing and the RCD housing
Data Source
AI summary
A rotating control device (RCD) for use during a drilling operation includes a bearing assembly. The bearing assembly includes a bearing body. The bearing assembly also includes a bearing housing positioned around the bearing body. The bearing assembly also includes a load ring positioned around the bearing housing. The load ring includes a tapered surface. The bearing assembly also includes a seal positioned below the load ring.