Flexible Arm Seal Arrangement for Flapper Valve
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Solution Overview
Problem
Elastomeric seals in downhole environments face harsh conditions, making metal-to-metal seals a more robust alternative desirable, but existing solutions lack effective arrangements for their use.
Innovation Solution
A seal arrangement featuring a body with a face seal and a flexible arm, where the arm includes a contact seal, allowing for both lower and higher pressure sealing by deflecting and making contact with the flapper in a flapper valve, ensuring fluid-tight seals without plastic deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If elastomeric seals are used in downhole environments, then sealing function is provided, but reliability deteriorates under harsh conditions
Solution Approach 1:
The patent changes the material parameter from elastomeric to metal, transitioning from a flexible polymer material to a rigid metallic material that can withstand harsh downhole conditions including high temperature, high pressure, and corrosive environments while maintaining sealing reliability
Solution Approach 2:
The patent employs composite sealing arrangements combining metal-to-metal contact seals with elastomeric backup rings or O-rings, creating a composite structure that leverages the strength and temperature resistance of metal while utilizing the elasticity and conformability of elastomers to ensure reliable sealing under varying pressure conditions
2Strength
If metal-to-metal seals are used instead of elastomeric seals, then robustness is improved, but adaptability to varying pressure conditions deteriorates
Solution Approach 1:
The patent divides the sealing system into multiple functional segments: a rigid metal-to-metal contact seal for structural strength and temperature resistance, combined with flexible elastomeric backup rings or O-rings for pressure adaptation, allowing each segment to perform its specialized function
Solution Approach 2:
The patent introduces elastomeric backup rings or O-rings as intermediary elements between the metal-to-metal contact surfaces, which act as mediators that can deform to accommodate pressure variations while supporting the rigid metal seal structure
3Manufacturing precision
If a rigid seal structure is used, then manufacturing precision is improved, but ease of operation deteriorates due to inability to deflect
Solution Approach 1:
The patent applies local quality by making different parts of the sealing system have different mechanical properties: the metal-to-metal contact seal portion is rigid with precise geometry for manufacturing accuracy, while the elastomeric backup rings or O-ring portions are locally made flexible to provide deflection capability during operation
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 flexible arm configuration maintains a fluid-tight seal across varying pressure ranges, preventing damage and ensuring the seal remains functional for repeated operations, effectively substituting for elastomeric seals in harsh conditions.
Implementation Method 1
a flexible arm extending from the body, the arm including a contact seal, positioned to make sealing contact with the flapper in selected flapper positions
Data Source
AI summary
A seal arrangement includes a body having a face seal, and a flexible arm extending from the body. The arm includes a contact seal. A flapper valve, includes a housing, a flapper and a flapper seat. The flapper seat includes a body having a face seal positioned to make sealing contact with the flapper in selected flapper positions A method for sealing a flapper valve includes closing a flapper toward a seat and making a seal, by deflecting a flexible arm of the flapper seat that supports a contact seal. A borehole system including a borehole in a subsurface formation, a string in the borehole, and a seal arrangement disposed within or as a part of the string.