Shape-Memory Alloy Fastener for Remote Wellbore Actuation
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Solution Overview
Problem
Existing fastening technologies face challenges in quickly, remotely, and selectively actuating fasteners, particularly in remote locations like wellbores, due to inefficiencies and impracticalities of manual, motor-driven, or hydraulic methods.
Innovation Solution
A shape-memory alloy actuated fastener that changes physical shape upon heating or cooling, allowing for the selective interlocking or releasing of components, utilizing a temperature-control device to control the shape change for efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a motor is used to actuate the fastener, then the fastener can be remotely actuated, but the device size increases and power consumption increases
Solution Approach 1:
The patent replaces the motor-driven mechanical actuation system with a shape-memory alloy-based thermal actuation system. The shape-memory alloy elements directly transform thermal energy into mechanical displacement to actuate the fastener, eliminating the need for motors, gears, and other mechanical transmission components, thereby significantly reducing device size and weight.
Solution Approach 2:
The patent utilizes the temperature-dependent shape memory effect of shape-memory alloys to change the physical state and dimensions of the alloy elements. By controlling temperature parameters (heating to trigger shape change, cooling to reset), the fastener achieves remote actuation without requiring a compact motor system.
2Ease of operation
If a motor is used to actuate the fastener, then the fastener can be remotely actuated, but power consumption increases and mechanical failures become more likely
Solution Approach 1:
The patent replaces complex mechanical actuation systems (motors, gears, linkages) with a shape-memory alloy-based thermal actuation system. The shape-memory alloy elements directly transform thermal energy into mechanical displacement, eliminating mechanical transmission components that are prone to wear, friction, and failure, thereby significantly improving reliability.
Solution Approach 2:
The shape-memory alloy elements inherently convert thermal energy into mechanical work without requiring additional mechanical conversion mechanisms. The material's intrinsic shape memory effect provides the actuation force directly, reducing the number of moving parts and potential failure points in the system.
3Ease of operation
If hydraulic pressure is used to actuate the fastener, then the fastener can be remotely actuated, but the actuation time increases and control precision decreases
Solution Approach 1:
The patent utilizes the phase transition phenomenon of shape-memory alloys between martensite (low-temperature) and austenite (high-temperature) phases. This solid-state phase transition occurs rapidly when thermal energy is applied, enabling quick shape change and fastener actuation without the delays associated with hydraulic system response times.
Solution Approach 2:
The patent replaces hydraulic actuation with direct thermal-structural coupling through shape-memory alloy elements. The thermal diffusion and phase transition process in the alloy occurs much faster than hydraulic fluid compression and mechanical transmission, resulting in significantly reduced actuation time.
4Ease of operation
If hydraulic pressure is used to actuate the fastener, then the fastener can be remotely actuated, but control precision decreases
Solution Approach 1:
The patent utilizes the temperature-dependent shape memory effect of shape-memory alloys to achieve precise control of the fastener actuation. By controlling temperature parameters (heating to trigger shape change, cooling to reset), the fastener achieves precise and repeatable actuation without the control delays and imprecision associated with hydraulic systems.
Solution Approach 2:
The shape-memory alloy-based system provides inherent feedback through its phase transition behavior. The alloy naturally transitions between phases at specific temperature thresholds, providing self-regulating actuation that is easier to control precisely compared to hydraulic systems that require complex feedback mechanisms to achieve similar precision.
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
Enables quick, remote, and selective actuation of fasteners, improving efficiency and control compared to traditional methods by leveraging the shape-memory properties of alloys like Ni-Ti or Cu-Al-Ni to change shapes and function states.
Implementation Method 1
A shape-memory alloy actuated fastener can include a shape-memory alloy. The shape-memory alloy can have a physical shape that is selectively changeable between a first shape and a second shape.
Implementation Method 2
The physical shape of the shape-memory alloy can be selectively changeable between a first shape and a second shape by heating or cooling the shape-memory alloy.
Data Source
AI summary
An assembly includes a fastener deployable in a wellbore and actuated by a shape-memory alloy. The shape-memory alloy releaseably interlocks multiple components deployed in the wellbore. The physical shape of the shape-memory alloy can be selectively changed between a first shape and a second shape.