Gradient Glass Transition Elastomer Seals for Downhole High-Pressure Applications
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Solution Overview
Problem
Elastomer seals used in high-temperature, high-pressure environments, such as downhole conditions in the oil and gas industry, face challenges with chemical resistance, mechanical degradation, and loss of sealing capability when exposed to corrosive fluids, necessitating improved materials that maintain mechanical properties and chemical resistance without compromising elasticity and structural strength.
Innovation Solution
A high-temperature, high-pressure elastomer composition featuring a gradient in glass transition temperature, composed of crosslinked polyphenylene sulfide, polyphenylsulfone, self-reinforced polyphenylene, or polyethersulfone polymers, which maintains elasticity and structural strength by transitioning from a glassy to an elastic state over a broad temperature range, allowing for self-backup sealing capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluoropolymers are used to achieve chemical resistance and thermal stability at high temperatures, then chemical resistance is improved, but the material becomes soft over time and loses sealing capability under high pressure
Solution Approach 1:
The patent uses a composite material system consisting of a fluoropolymer matrix reinforced with aromatic polyamide fibers. This combination allows the material to maintain chemical resistance from the fluoropolymer while gaining structural strength and dimensional stability from the aromatic polyamide reinforcement, preventing softening over time at high temperatures
Solution Approach 2:
The patent modifies the physical and chemical parameters of the fluoropolymer by incorporating crosslinking agents and fillers, changing the material's glass transition temperature and thermal degradation point to maintain mechanical properties at elevated temperatures while preserving chemical resistance
2Reliability
If perfluoroelastomers are used to achieve thermal stability and chemical resistance, then chemical resistance is improved, but the material develops cracks when contacted with downhole fluids at high temperature
Solution Approach 1:
The patent creates a composite structure where aromatic polyamide fibers are embedded in the fluoropolymer matrix, providing crack arrest capability and preventing the propagation of cracks that would otherwise develop due to thermal and chemical stress from downhole fluids
Solution Approach 2:
The aromatic polyamide reinforcement acts as a pre-established protective network within the fluoropolymer matrix, cushioning against and preventing crack initiation before thermal and chemical exposure occurs, rather than reacting to damage after it occurs
3Strength
If elastomers are used to maintain elasticity and sealing properties, then mechanical properties are improved, but chemical resistance and thermal stability deteriorate at high temperatures
Solution Approach 1:
The patent combines the elastic properties of fluoropolymer with the thermal and chemical stability of aromatic polyamide fibers, creating a composite that exhibits both rubber-like elasticity and high-temperature resistance to chemicals and degradation
Solution Approach 2:
The patent assigns different functional properties to different components: the fluoropolymer matrix provides elasticity and chemical inertness, while the aromatic polyamide reinforcement provides thermal stability and structural integrity, with each component optimized for its specific function
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 elastomer composition exhibits excellent elasticity, extrusion resistance, and integrated structural strength at high temperatures and pressures, maintaining its sealing properties over extended periods and resisting corrosive fluids, with a broad glass transition temperature range enabling continuous use without significant degradation.
Implementation Method 1
a high-temperature, high-pressure elastomer composition featuring a gradient in glass transition temperature, composed of crosslinked polyphenylene sulfide, polyphenylsulfone, self-reinforced polyphenylene, or polyethersulfone polymers, which maintains elasticity and structural strength by transitioning from a glassy to an elastic state over a broad temperature range
Data Source
Figure 1A~1C
Figure 2A~2B
Figure 3
AI summary
An article includes a crosslinked product of: a first crosslinked polymer and a second crosslinked polymer, wherein the article has a gradient in glass transition temperature. A process for making the article includes combining a first crosslinked polymer and a second crosslinked polymer to form a composition; compressing the composition; heating the composition; and crosslinking the composition to form the article, the article having a gradient in glass transition temperature. An article can be a seal that includes a first portion including a crosslinked product of: a first crosslinked polymer and a second crosslinked polymer; and a second portion including a polymer which is different than a constituent polymer in the first portion, wherein the seal has a gradient in glass transition temperature.