Porous Polymer Filtration Media With Shape Memory Expansion
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Solution Overview
Problem
Existing sand control devices face performance issues under high temperature downhole conditions, as conventional materials degrade or fail to effectively filter particulates in such environments.
Innovation Solution
A filtration medium comprising a high temperature polymeric material with integrated shape memory polymer that expands and filters fluid, degrading to leave a porous structure, allowing it to withstand and adapt to high temperatures and filter out undesirable materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional materials are used in sand control devices, then the device structure is simple and easy to manufacture, but the device fails to withstand high temperature downhole conditions and performance degrades
Solution Approach 1:
The filtration medium uses a composite structure combining shape memory polymer (SMP) particles dispersed within a porous polymeric matrix. The SMP particles provide shape memory functionality for expandability while the porous matrix provides structural support and filtration capability, creating a composite material that withstands high temperature conditions while maintaining device functionality.
Solution Approach 2:
The shape memory polymer particles undergo parameter changes in response to temperature variations. When exposed to downhole high temperature conditions, the SMP particles transition from a compacted state to an expanded state, changing their physical parameters (volume, shape) to enable the filtration medium to expand and conform to the borehole geometry, thereby improving reliability without requiring complex mechanical actuation systems.
2Ease of operation
If the filtration medium is deployed in a compacted shape for ease of deployment, then the ease of operation improves, but the filtration effectiveness is reduced until expansion occurs
Solution Approach 1:
The filtration medium is pre-configured with shape memory polymer particles that are designed to automatically activate upon exposure to downhole temperature conditions. This preliminary configuration allows the medium to be deployed in a compacted state for ease of operation, while the SMP particles are already positioned to trigger expansion automatically, eliminating the need for complex external actuation mechanisms and ensuring filtration effectiveness is achieved through self-activation.
Solution Approach 2:
The shape memory polymer particles provide self-service functionality by automatically expanding the filtration medium in response to temperature changes without requiring external control systems. The SMP particles sense the downhole temperature condition and autonomously drive the expansion process, converting thermal energy into mechanical work to transform the filtration medium from compacted to expanded state, thereby maintaining both ease of deployment and filtration effectiveness.
3Adaptability or versatility
If shape memory polymer is used to enable expandability, then the adaptability to borehole geometry improves, but the material's ability to withstand high temperature is compromised
Solution Approach 1:
The filtration medium employs local quality differentiation by dispersing shape memory polymer particles throughout a porous polymeric matrix rather than using a homogeneous material. The SMP particles are strategically distributed to provide localized shape memory functionality for expansion and conformance to borehole geometry, while the surrounding porous matrix material is selected to provide high temperature resistance and structural integrity, allowing the composite to withstand temperatures that would normally degrade pure SMP materials.
Solution Approach 2:
The use of a porous polymeric matrix structure provides multiple benefits: it allows the shape memory polymer particles to be embedded within the matrix framework, protects the SMP particles from direct thermal degradation through the thermal buffering effect of the porous structure, and maintains structural integrity at high temperatures while still enabling the SMP particles to expand and drive the overall medium expansion for adapting to borehole geometry.
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 filtration medium effectively filters sand and particulates in high temperature environments, offering extended deployment periods and alternative to gravel packing systems.
Implementation Method 1
a second polymeric material including a shape memory polymer disposed within the fluid passages, the shape memory polymer configured to expand in the plurality of fluid passages and cause the filtration medium to expand in the borehole
Implementation Method 2
the shape memory polymer configured to expand in the plurality of fluid passages and cause the filtration medium to expand in the borehole, and remove from the porous structure
Data Source
Figure 1
Figure 2A~2F
Figure 3
AI summary
A fluid control device includes a support structure configured to be deployed to a selected location in a borehole, and a filtration medium disposed at the support structure and configured to filter a fluid, the filtration medium configured to be compacted from an initial shape to a compacted shape prior to deployment in the borehole. The filtration medium includes a first polymeric material configured to withstand a temperature at the selected location, the first polymeric material forming a porous structure including a plurality of fluid passages, and a second polymeric material including a shape memory polymer disposed within the fluid passages, the shape memory polymer configured to expand in the plurality of fluid passages and cause the filtration medium to expand in the borehole.