Shape Memory Polymer Foam for Borehole Filtration
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Solution Overview
Problem
Existing sand control devices in subterranean operations face performance degradation under high downhole temperatures, limiting their effectiveness in filtering particulates and stabilizing production formations.
Innovation Solution
A fluid control device utilizing a thermoplastic polymer foam with shape memory properties, which can be compressed for deployment and expanded downhole to conform to the borehole, filtering sand and particulates while withstanding high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sand control devices are used downhole, then they can filter particulates and stabilize production formations, but high temperature conditions cause performance degradation
Solution Approach 1:
The patent employs shape memory polymers that undergo parameter changes in response to temperature variations. The SMP material transitions from a compressed low-profile state during deployment to an expanded conformable state when exposed to downhole temperatures, thereby adapting to the thermal environment rather than degrading from it. This parameter change enables the device to maintain reliability across the temperature range.
Solution Approach 2:
The invention uses composite structures combining shape memory polymers with filtration media and support frameworks. This composite approach creates a material system that integrates the temperature-responsive shape-changing capability of SMP with the filtration functionality and structural integrity needed for sand control, allowing the device to withstand high temperatures while maintaining performance.
2Ease of operation
If sand control devices are deployed in compressed state, then they can be inserted into boreholes, but they must expand to conform to borehole walls for effective filtration
Solution Approach 1:
The patent utilizes dynamically responsive shape memory polymers that can change their physical state and shape in response to environmental triggers. The device is deployed in a compressed, low-profile state that facilitates easy insertion, then dynamically transforms to an expanded, conformable shape when exposed to downhole conditions, achieving both deployment ease and effective borehole wall contact for filtration.
Solution Approach 2:
The shape memory polymer undergoes phase transitions between different thermal states to achieve shape changes. During deployment, the material is in a state that allows compression; upon exposure to downhole temperatures, it transitions to an expanded conformable state, enabling the device to adapt its shape from a compact insertion form to a borehole-wall-conforming filtration structure.
3Reliability
If porous media is used for filtration, then sand and particulates can be filtered, but the material must withstand high temperatures without degrading
Solution Approach 1:
The patent employs shape memory polymers with carefully selected glass transition temperatures that allow the material to undergo beneficial parameter changes at downhole temperatures rather than degrading. The SMP material's thermal parameters are tuned so that the operating temperature range induces shape changes and activation of filtration functionality while remaining below degradation thresholds, thereby achieving temperature resistance through controlled parameter evolution.
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 thermoplastic polymer foam effectively filters sand and particulates in high-temperature environments, providing robust sand control and stabilization in subterranean operations.
Implementation Method 1
The porosity of the thermoplastic polymer imparts a shape memory characteristic to the porous medium, which allows the porous medium to be compressed into a run-in shape and size, and expanded downhole to conform to a borehole
Implementation Method 2
Fluid entering a borehole from a subterranean region into an annulus flows through the porous medium and into a fluid conduit in fluid communication with the surface, while sand and other particulates, as well as larger solids, are prevented from entering the fluid conduit
Data Source
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Figure 2A~2C
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AI summary
A fluid control device includes a support structure configured to be deployed in a borehole, and a filtration component disposed at the support structure, the filtration component including a porous medium made from a thermoplastic polymer material, the porous medium including an open cell foam. The porous medium has a porosity selected to cause the porous medium to exhibit shape memory behavior, and the porous medium is configured to be compacted from an initial shape to a compacted shape, deployed in the borehole, and subsequently expanded due to a downhole temperature to conform to a surface of the borehole.