Expandable Eutectic Alloy Downhole Tool for Gas-Tight Sealing
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Solution Overview
Problem
Existing downhole tools face challenges in maneuverability and forming gas-tight seals due to well obstructions and the need for additional sealing means, which can lead to malfunctions.
Innovation Solution
An expandable eutectic alloy-based downhole tool with a tubular body and eutectic alloy elements on its surface, using a heater to melt and resolidify the alloy for secure sealing, and an optional insulating sleeve to enhance heat retention and focused alloy ejection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional sealing means such as rubber seals are added to form a gas-tight seal, then sealing capability is improved, but device complexity and possibility of malfunction increase
Solution Approach 1:
The patent removes rubber seals and other additional sealing means from the downhole tool, relying instead on the eutectic alloy itself to form the gas-tight seal. The alloy is melted and injected to create a metal-to-metal seal between the tool and surrounding tubing, eliminating the need for separate sealing components and reducing overall device complexity while maintaining sealing capability.
Solution Approach 2:
The patent changes the physical state of the eutectic alloy from solid to liquid and back to solid through controlled heating and cooling. The alloy is heated to its melting point to become liquid for injection, then allowed to cool and resolidify, forming a permanent metal-to-metal seal. This phase transition enables the alloy to serve both as a securing mechanism and a sealing medium.
2Ease of operation
If the outer diameter of the downhole tool is reduced to improve maneuverability, then ease of operation is improved, but the ability to form a metal-to-metal connection is compromised
Solution Approach 1:
The patent segments the eutectic alloy into multiple separate elements positioned at different locations around the tool's outer surface. These discrete alloy elements can be independently melted and injected to form multiple separate metal-to-metal connections between the tool and surrounding tubing, ensuring adequate connection strength even when the tool has a reduced outer diameter for improved maneuverability.
3Reliability
If the tool is expanded to reduce clearance and improve sealing, then sealing capability is improved, but the risk of alloy fracture during expansion increases
Solution Approach 1:
The patent divides the eutectic alloy into multiple separate elements rather than using a single continuous ring. This segmentation allows each individual alloy element to expand and contract independently during tool deployment and expansion, reducing stress concentration and the risk of fracture that would occur in a continuous alloy structure.
Solution Approach 2:
The patent positions the eutectic alloy elements on the outer surface of the tool where they can dynamically respond to expansion forces. The alloy elements are allowed to move and deform with the tool during expansion, rather than being rigidly constrained, which reduces the likelihood of fracture while still maintaining effective sealing when the tool reaches its expanded state.
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 tool provides improved maneuverability and forms a gas-tight seal with reduced heat loss, ensuring secure deployment and sealing in well environments, particularly in Open Hole Gravel Packs.
Implementation Method 1
Once in position the heat source is used to melt the alloy, which flows a short distance before it begins to cool and turn back into a solid.
Implementation Method 2
a heat source is inserted into the tubular tool and positioned at a point within the tool that is adjacent to the externally mounted alloy
Implementation Method 3
the alloy flows a short distance before it begins to cool and turn back into a solid
Implementation Method 4
an optional insulating sleeve to enhance heat retention and focused alloy ejection
Data Source
AI summary
A tool and method providing a eutectic alloy based downhole tool comprising a tubular body alloy located on an outer surface thereof, said tool having an outer diameter with a clearance from the inner diameter of the well. The downhole tool is delivered to a target region within an oil/gas well where the tool is to be deployed. Once the tool is in position within the well a tubular expanding tool is run through the interior of the tubular body to increase the outer diameter of the sealing downhole tool and in so doing reduce the clearance between the alloy and the well. A heater is deployed within the tubular body proximal to the alloy and operated to melt the alloy. The alloy is then allowed to cool and resolidify, whereby the tool is sealed in place within the target region of the well using the alloy.