Segmented Retaining Ring for High-Pressure Downhole Sealing
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Solution Overview
Problem
Designing robust downhole sealing systems that fit within tight downhole confines and maintain integrity under high pressure and temperature conditions is challenging, particularly in sealing between tubular equipment and wellbores.
Innovation Solution
A retaining ring system with pre-formed retention segments and a closure mechanism is used to secure sealing elements to a mandrel, utilizing a channel defined by ring and mandrel grooves, with optional spring compression and interlocking end segments to enhance stability and resistance to axial forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single continuous retaining ring is used to secure sealing elements, then the structural integrity and resistance to axial forces is improved, but the device complexity and difficulty of assembly increases
Solution Approach 1:
The retaining ring is divided into multiple discrete retention segments that can be individually inserted into the channel between the mandrel and retaining ring. Each segment provides localized reinforcement and collectively they resist axial forces, while the segmented design allows for simpler assembly compared to a single continuous ring.
2Ease of operation
If retention segments are inserted through an access opening, then the ease of assembly is improved, but the reliability and security of attachment may worsen
Solution Approach 1:
The retention segments are pre-formed with specific geometries (such as rounded ends or tapered profiles) that facilitate their insertion through the access opening. The channel is designed with dimensions that guide the segments into proper positioning, ensuring reliable attachment while maintaining ease of assembly.
3Adaptability or versatility
If the retaining ring system is designed to fit within tight downhole confines, then the adaptability to downhole environments is improved, but the device complexity increases
Solution Approach 1:
The retention segments are nested within the channel formed between the mandrel and the retaining ring. This nested configuration allows the system to fit within tight downhole confines while maintaining structural integrity. The segments are contained within the annular space, maximizing space utilization without requiring additional external components.
4Reliability
If multiple retention segments are used to secure the sealing element, then the reliability and resistance to axial forces is improved, but the device complexity and number of components increases
Solution Approach 1:
The retention segments are designed as universal components that can be used in various configurations and positions around the channel. Each segment performs the same function of resisting axial forces and securing the sealing element, allowing for standardized manufacturing and assembly while providing enhanced reliability through redundancy.
Data Source
AI summary
Apparatus and methods are disclosed for securing a component, such as a sealing element, to a tubular member, such as a mandrel, of a downhole tool. In at least one example, a retaining ring is used to secure the component to a mandrel. The retaining ring is secured to the mandrel with a plurality of discrete retention segments disposed within a channel at least partially defined by an internal groove on the retaining ring and an external groove on the mandrel. The retention segments are individually insertable into the channel through an access opening on the retaining ring. A compression spring may be provided in the channel to provide compressive engagement of the retention segments. Various closure configurations are also disclosed for closing the access opening once the retention segments have been inserted.