Integrated Rotating Seal Assembly for RCD and Annular BOP
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Solution Overview
Problem
Current drilling systems face challenges in efficiently managing pressure and fluid flow during drilling operations, particularly in softer seabed locations, which can lead to well expansion or collapse, and require separate rotating control devices (RCD) and blowout preventers (BOP), increasing complexity and cost.
Innovation Solution
A rotating control device (RCD) system that integrates a housing, seal element, bearing assembly, and piston assembly to form a seal against the drill string and itself, allowing for adjustable sealing and operation as both an RCD and annular BOP within a common housing, reducing component count and operational complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate rotating control devices (RCD) and blowout preventers (BOP) are used, then each device can perform its specific function reliably, but the device complexity and component count increase
Solution Approach 1:
The patent combines the RCD and annular BOP into a single integrated device with a common housing. The seal element can function as both an RCD seal (when engaged with the drill string) and a BOP seal (when engaged with itself), eliminating the need for separate devices while maintaining the reliability of both sealing functions through a unified design
2Reliability
If separate RCD and BOP components are used, then each component can be optimized for its specific function, but the manufacturing cost and installation complexity increase
Solution Approach 1:
The seal element is designed with universal functionality to serve dual purposes: it can seal against the drill string during drilling operations (RCD function) and seal against itself during well control operations (BOP function). This multi-functionality reduces the total number of components that need to be manufactured, assembled, and maintained, thereby reducing manufacturing costs while preserving sealing performance
3Device complexity
If a unified RCD-BOP system is used, then component count and operational complexity are reduced, but the seal element must perform multiple functions simultaneously
Solution Approach 1:
The seal element is designed with dynamic adaptability, allowing it to change its sealing configuration based on operational requirements. Through the piston assembly, the seal element can be positioned to engage with the drill string for RCD operation or engage with itself for BOP operation. This dynamic reconfigurability enables a single component to perform multiple sealing functions without compromising adaptability
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 integrated RCD system effectively manages pressure and fluid flow, reduces component costs, and simplifies operations by providing a unified solution for sealing during drilling, whether the drill string is present or absent, thus enhancing drilling efficiency and safety in various geological conditions.
Implementation Method 1
the seal element can be configured to seal against the drill string to thereby block the drilling fluid... from passing across the seal element
Implementation Method 2
the seal element is configured to rotate relative to the drill string
Implementation Method 3
a piston assembly positioned within the housing and configured to drive the seal element into contact with the drill string or to seal against itself
Data Source
AI summary
A rotating control device (RCD) system includes a housing having a bore, a seal element positioned within the housing, a piston assembly supported within the housing and configured to drive the seal element to seal the bore, and a bearing assembly supported within the housing and configured to enable the seal element to rotate relative to the housing. The bearing assembly includes a first bearing section positioned between the housing and the seal element and a second bearing section positioned between a piston of the piston assembly and the seal element.