Variable Tg Shape Memory Materials for Wellbore Devices
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Solution Overview
Problem
Existing wellbore devices lack versatility in deployment and configuration for applications like filtration, wellbore isolation, and production control, as they rely on single shape-memory materials with fixed transition temperatures, limiting flexibility and deployment options.
Innovation Solution
The use of at least two shape-memory materials with different onset glass transition temperatures and slope changes allows for controlled geometric shape recovery at distinct temperatures, enabling flexible deployment and configuration by maintaining altered geometric positions during run-in and recovering to original shapes at specific downhole temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single shape-memory material with fixed transition temperature is used, then the device structure is simple, but the deployment flexibility and configuration options are limited
Solution Approach 1:
The wellbore device is segmented into multiple shape-memory material layers, each with distinct transition temperatures (e.g., first layer with Tg1=80°C, second layer with Tg2=120°C). This segmentation allows independent control of deployment stages, enabling the device to maintain structural integrity during run-in and then progressively deploy at different downhole temperature zones, thereby achieving deployment flexibility without requiring a completely complex multi-component system.
Solution Approach 2:
Different regions of the wellbore device are assigned shape-memory materials with locally optimized transition temperatures matching the specific downhole thermal environment of each deployment zone. The inner layer uses material with lower Tg for early deployment in cooler zones, while outer layers use materials with higher Tg for subsequent deployment in hotter zones, allowing each local region to deploy at its optimal temperature condition.
2Adaptability or versatility
If multiple shape-memory materials with different transition temperatures are used, then deployment flexibility is enhanced, but the device complexity increases
Solution Approach 1:
The device employs a composite structure where multiple shape-memory polymer layers are co-extruded or laminated together in a single integrated component. Each layer contains different shape-memory materials with distinct transition temperatures, but they are manufactured as one unified device assembly, reducing the complexity of handling and installation compared to assembling separate components, while still providing enhanced configuration options through the layered composite architecture.
3Manufacturing precision
If the device is maintained in altered geometric position during run-in, then deployment control is improved, but the recovery time at downhole temperature is extended
Solution Approach 1:
The shape-memory materials are pre-conditioned during manufacturing to maintain their altered geometric configuration at ambient temperatures, and this constrained state is preserved through the run-in process using temporary mechanical constraints. Once the device reaches the target downhole location and the temperature exceeds the transition temperature, the pre-programmed shape recovery is activated, allowing the device to quickly transition from the constrained run-in configuration to its functional deployed configuration without requiring extended recovery time.
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
This approach enhances the versatility and flexibility of wellbore devices, allowing for controlled deployment and configuration, improving their functionality in filtration, isolation, and production control by ensuring precise shape recovery at varying temperatures, thus meeting diverse downhole requirements.
Implementation Method 1
Shape-memory materials are smart materials that have the ability to return from a deformed state (temporary shape) to their original (permanent) shape induced by an external stimulus or trigger (e.g. temperature change)
Implementation Method 2
By scanning the temperature during a DMA experiment this change of state, the transition from the glass state to the rubber state, may be characterized. The Tg Onset is also the point where shape recovery can begin.
Data Source
AI summary
Wellbore devices for use in filtration, wellbore isolation, production control, lifecycle management and wellbore construction may include at least a first and a second shape-memory material each having an altered geometric position and each an original geometric position. Each shape-memory material may be held in the altered geometric run-in position at a temperature below glass transition temperature (Tg), where the Tgs and/or the respective slope changes of the first and second shape-memory materials are different. Optionally the shape-memory materials may be crosslinked polymers where the crosslinked polymers have different crosslinking ratios from one another. Once the wellbore device is in place downhole and the first and second shape-memory materials are subjected to temperatures above their Tgs, the materials will deploy to recovered geometric positions at or near their original geometric positions to perform their filtration, isolation, control or other function. These deployments may occur at different times or rates.