Multi-elastomer Seal for Extreme Wellbore Conditions
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Solution Overview
Problem
Existing seals in mineral extraction systems face challenges in maintaining effective sealing across a wide range of temperatures and pressures due to limitations in single elastomer materials, which can fail under extreme conditions such as corrosive fluids and rapid pressure fluctuations, leading to potential failures from explosive decompression.
Innovation Solution
A multi-elastomer seal is developed, comprising a combination of hard and soft elastomer portions, where the hard outer elastomer protects the inner elastomer from high-pressure and high-temperature environments, and the soft inner elastomer maintains sealing effectiveness at lower temperatures, thereby extending the operational range and resistance to corrosive attacks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single elastomer seal is used, then the seal design is simple and installation forces are low, but the seal fails under extreme temperatures and pressures
Solution Approach 1:
The patent applies composite materials by combining multiple elastomer materials with different properties (e.g., fluorocarbon for high temperature resistance, nitrile for chemical resistance) into a single seal structure. This allows the seal to maintain reliability across extreme temperature and pressure ranges while preserving the simplicity of elastomeric seal design and low installation forces.
2Adaptability or versatility
If a single elastomer seal is used, then manufacturing tolerances are flexible, but the seal is limited to a narrow operating range
Solution Approach 1:
The patent applies local quality by assigning different elastomer materials to different regions or layers of the seal based on their specific properties. For example, the outer layer may use fluorocarbon for high-temperature environments while the inner layer uses nitrile for chemical resistance. This allows the seal to adapt to varied operating conditions across different locations, expanding the overall operating range while maintaining straightforward elastomeric construction.
3Reliability
If metal seals are used, then long-term resistance to well bore fluids and pressures is achieved, but high installation forces and complicated design are required
Solution Approach 1:
The patent applies composite materials by creating an elastomeric seal reinforced with metal elements or coated with metal layers. This composite structure provides the long-term resistance to well bore fluids and pressures characteristic of metal seals, while maintaining the flexibility and low installation force requirements of elastomeric seals. The metal components enhance durability without sacrificing ease of installation.
Data Source
AI summary
A system, in certain embodiments has, a fluid seal having a seal body, including a seal interface having one or more engagement portions, a first elastomer portion disposed along the seal interface, and a second elastomer portion disposed along the seal interface, wherein the first and second elastomers have material properties that are different from one another.