Graded Polymer Seals for Wellbore Pressure and Temperature Cycling
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Solution Overview
Problem
Conventional polymer seals for wellbore downhole tools fail due to loss of mechanical integrity and sealing ability under pressure and temperature cycling in downhole environments, often resulting from uniform mechanical properties that compromise performance.
Innovation Solution
Manufacture polymer seals with graded mechanical properties across dimensions using directed energy processes like 3D printing, allowing for tailored hardness, stiffness, and strength variations through controlled application of energy parameters and constituent material concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polymer seals are manufactured with uniform mechanical properties, then manufacturing is simpler and more consistent, but sealing ability and durability under pressure and temperature cycling deteriorate
Solution Approach 1:
The patent applies local quality by creating a polymer seal with non-uniform mechanical properties distributed throughout its volume. The polymer seal comprises a continuous polymer matrix with fillers concentrated at specific locations, creating regions of varying hardness, stiffness, and strength. This allows different portions of the seal to have optimized properties for their specific functional requirements, such as softer regions for sealing contact and harder regions for structural support, thereby improving sealing ability and durability under downhole conditions.
2Strength
If polymer seals are made harder to improve pressure resistance, then sealing ability improves, but the seal becomes more difficult to compress and install
Solution Approach 1:
The patent resolves this contradiction by implementing local quality with spatially varying mechanical properties. The polymer seal contains fillers concentrated in specific regions, creating a gradient where certain areas have higher hardness for pressure resistance while other areas maintain lower hardness for compressibility. This allows the seal to be both installable and pressure-resistant without requiring a compromise in overall hardness.
3Ease of operation
If polymer seals are made softer to improve compressibility, then ease of installation improves, but pressure resistance and structural integrity deteriorate
Solution Approach 1:
The patent applies local quality by strategically distributing fillers within the polymer matrix to create regions of differentiated mechanical properties. Softer regions without fillers provide compressibility for easy installation, while harder regions with concentrated fillers provide pressure resistance and structural integrity. This spatial differentiation allows the seal to exhibit both soft and hard characteristics simultaneously in different locations.
4Adaptability or versatility
If multiple polymer pieces with different properties are assembled, then mechanical property variation is achieved, but the seal may separate under downhole conditions
Solution Approach 1:
The patent merges multiple polymer compositions into a single monolithic structure. Instead of assembling separate polymer pieces with different properties, the invention uses a continuous polymer matrix with fillers distributed throughout, creating a unified structure where all regions are chemically and mechanically bonded. This eliminates the risk of separation between pieces while maintaining the desired variation in mechanical properties through filler distribution.
5Reliability
If directed energy processing is used to create graded mechanical properties, then sealing performance improves, but manufacturing complexity and process control difficulty increase
Solution Approach 1:
The patent applies parameter changes by utilizing the directed energy source to locally modify the physical and chemical parameters of the polymer material during processing. By varying energy parameters such as power, duration, and distribution, the process creates controlled variations in filler concentration, polymer crosslinking, and material density, resulting in graded mechanical properties throughout the seal while managing manufacturing complexity through parameter optimization.
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 graded mechanical properties enhance sealing ability and durability under temperature cycling, preventing separation and improving service quality by forming a continuous, monolithic polymer seal with localized variations in hardness and stiffness.
Implementation Method 1
processing the pre-polymer resin including applying directed energy from a directed energy source such that the pre-polymer resin is at least partially polymerized to form a polymer seal
Data Source
AI summary
Method of manufacturing a wellbore downhole tool, including providing a pre-polymer resin and processing the pre-polymer resin. Processing the pre-polymer resin includes applying directed energy from a directed energy source such that the pre-polymer resin is at least partially polymerized to form a polymer seal of the wellbore downhole tool, the polymer seal having one of more mechanical properties that differ along one or more dimensions of the polymer seal.