Flapper and Seat Hard Soft Seal Subsurface Safety Valve
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Solution Overview
Problem
Existing subsurface safety valves (SCSSVs) in subterranean operations face challenges with costly and complex designs, particularly in maintaining a reliable seal against well debris and varying pressures, which can lead to incomplete closure and leakage.
Innovation Solution
A flapper and seat assembly with a tubular metallic seat, a hinge, and a secondary sealing element, such as an undulating spring-loaded lip seal, is used to enhance the sealing capability, allowing the flapper to pivot between open and closed positions, and the secondary sealing element provides a secure seal even at lower pressures, preventing well debris interference and ensuring leak-tight closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional SCSSV design with many small specialized parts is used, then the valve can provide sealing function, but the cost of implementation and replacement becomes costly and complex
Solution Approach 1:
The patent combines multiple sealing functions into a single flapper component that integrates both metal-to-metal sealing surfaces and elastomeric seal elements. The flapper assembly merges the seat, sealing surfaces, and elastomeric components into one unified structure, eliminating the need for multiple separate specialized parts while maintaining reliable sealing functionality.
Solution Approach 2:
The flapper component is designed to perform multiple functions simultaneously: it provides metal-to-metal sealing, elastomeric sealing, structural support, and debris exclusion. This multi-functional design reduces the number of specialized parts needed while maintaining comprehensive sealing capability across different operating conditions.
2Productivity
If hydraulic fluid pressure is applied to hold the SCSSV open during production, then the valve remains open for hydrocarbon flow, but the system requires an auxiliary control conduit extended along the tubing string
Solution Approach 1:
The patent extracts the sealing function from the hydraulic control system and places it directly in the flapper component. The elastomeric seals are integrated into the flapper assembly itself, allowing the valve to maintain sealing capability without relying on the auxiliary control conduit system, thereby simplifying the overall control architecture.
3Reliability
If a seal mechanism is designed to work against varying pressures and well debris, then reliable sealing can be achieved, but the design becomes complex and costly to implement
Solution Approach 1:
The patent applies different sealing qualities to different regions of the flapper component. The outer sealing surfaces are made of metal-to-metal contact for high-pressure sealing, while elastomeric seal elements are positioned at specific locations to handle debris exclusion and low-pressure sealing. This localized differentiation provides comprehensive sealing capability without requiring complex mechanisms throughout the entire component.
Solution Approach 2:
The flapper assembly combines metal materials for structural strength and high-pressure sealing surfaces with elastomeric materials for debris exclusion and flexible sealing. This composite construction allows the single component to handle varying pressures and debris conditions effectively without requiring multiple separate specialized parts.
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 enhanced sealing mechanism effectively maintains a low-pressure seal and prevents leakage, even under high flow rate conditions, reducing the risk of well contamination and improving operational safety by ensuring reliable closure and reducing maintenance costs.
Implementation Method 1
an undulating spring-loaded lip seal
Data Source
AI summary
A flapper and seat assembly, and systems and methods utilizing such assembly, are provided. The flapper and seat assembly includes a tubular metallic seat having a bore therethrough. The tubular metallic seat is one solid unit. The flapper and seat assembly further includes a hinge coupled to the tubular metallic seat and a flapper. The flapper is pivotally mounted to the hinge such that it is rotatable between an open position and a closed position. The flapper and seat assembly also includes a secondary sealing element located between the flapper and the tubular metallic seat. The secondary sealing element is one of an undulating or curved lip seal. The flapper and seat assembly further includes a seal that is formed between a sealing surface of the flapper and a sealing surface of the tubular metallic seat. The seal comprises an angle measured from a plane perpendicular to the centerline of the flapper and seat assembly.