Metal-to-Metal Non-Elastomeric Seal Stack for Sliding Sleeve Valves
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Solution Overview
Problem
Conventional sliding sleeve devices face seal degradation due to high pressures and temperatures, leading to erosion and reduced operational life, as thermoplastic seals wear away when fluid passes through under great pressure differentials.
Innovation Solution
A seal assembly featuring annular, chevron-shaped thermoplastic seal elements and metallic C-seal components with C-ring cross-sections, providing resilient metal-to-metal contact and protection against erosion, along with a diffuser function to reduce fluid velocity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermoplastic seal members are used to provide fluid sealing, then the seals can flex and bend to effect a better fluid seal, but the seals become subjected to erosional forces and wear away under high pressure differentials
Solution Approach 1:
The seal assembly combines thermoplastic seal members with metallic components (metallic seal member, diffuser ring, and housing) to create a composite structure. The thermoplastic material provides flexible sealing contact while the metal components provide erosion resistance and structural strength, allowing the seal to withstand high pressure differentials without wearing away.
Solution Approach 2:
The diffuser ring acts as an intermediary component between the high-pressure fluid flow and the thermoplastic seal members. It redirects and diffuses the fluid flow to reduce direct impingement on the seals, thereby protecting them from erosional forces while maintaining their flexible sealing capability.
2Adaptability or versatility
If standard thermoplastic seals are used in conventional sliding sleeve devices, then they work well for most applications, but they cannot withstand the increased pressures and temperatures at deeper drilling intervals
Solution Approach 1:
The seal assembly uses a composite construction with thermoplastic seal members for flexibility and sealing, combined with metal components (metallic seal member, diffuser ring, housing) for high temperature and pressure resistance. This composite structure enables the seal to operate in extreme wellbore conditions at deeper drilling intervals while maintaining versatility for standard applications.
3Productivity
If the sleeve valve is operated at high pressure differentials, then fluid communication between flowbore and annulus is achieved, but the thermoplastic seal members become subjected to great erosional forces and tend to wear away
Solution Approach 1:
The diffuser ring serves as a protective intermediary that intercepts the high-velocity fluid flow and redirects it away from the thermoplastic seal members. This mediator component reduces the erosional forces acting on the seals while allowing full fluid communication between the flowbore and annulus to proceed through the valve.
Solution Approach 2:
The harmful erosional effect is extracted and redirected by the diffuser ring, which channels the high-pressure fluid flow through a path that minimizes direct contact with the seal members. This separates the fluid flow function from the sealing function, allowing each to perform optimally without mutual interference.
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 seal assembly enhances durability and operational life by offering effective fluid sealing at higher temperatures and pressures, preventing seal erosion and extending the valve's operational range.
Implementation Method 1
C-seal support rings and end adapters that are shaped and sized to assist the metallic C-seals to be axially compressed and uncompressed to resiliently seal against both the inner sleeve member and the outer housing
Implementation Method 2
The metallic C-seals and their particular construction help the seal system to act as a fluid diffuser during opening and closing of the sleeve valve
Data Source
AI summary
An improved seal assembly for use in sliding sleeve valves. The seal assembly incorporates a number of annular, chevron-shaped seal elements that are in a stacked configuration and preferably formed of a thermoplastic material to provide a fluid seal between the outer housing and the inner sleeve member of the sliding sleeve valve. In addition, the seal assembly preferably includes a pair of annular metallic seal members that have a C-ring cross-section (a “C-seal”). On opposite axial sides of each metallic C-seal are a C-seal support ring and an end adapter that are shaped and sized to assist the metallic C-seals to be axially compressed and uncompressed to resiliently seal against both the inner sleeve member and the outer housing.