Compacted Thermite Heater for Downhole Alloy Sealing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for sealing boreholes, such as those used in oil and gas well abandonment, face challenges in achieving a reliable and efficient seal, particularly in terms of heat transfer and material compatibility.
Innovation Solution
A downhole apparatus and method utilizing a compressed thermite heater in combination with a low melt point alloy, where the thermite is compressed to reduce porosity and increase density, facilitating efficient heat transfer and a secure seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If thermite is used in a conventional low-density form, then the device complexity is reduced, but the heat transfer efficiency deteriorates due to high porosity
Solution Approach 1:
The patent applies parameter changes by compressing the thermite mixture to fundamentally alter its physical properties. The compression increases density from conventional low-density values to approximately 2.0-2.5 g/cm³, reducing porosity from 50-60% to 20-30%. This parameter transformation directly improves heat transfer efficiency while maintaining ease of manufacture through a simple compression step in the fabrication process.
2Loss of energy
If thermite is compressed to increase density, then heat transfer efficiency is improved, but the manufacturing process complexity increases
Solution Approach 1:
The patent applies preliminary action by performing the compression step during the initial fabrication process rather than as a separate subsequent operation. The thermite mixture is compressed within the housing structure itself during assembly, eliminating the need for additional equipment or complex multi-step manufacturing processes. This preliminary compression action achieves the desired density and heat transfer properties without significantly increasing overall manufacturing complexity.
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 compressed thermite heater effectively melts the alloy, which then solidifies to form a secure, impermeable plug, addressing the challenges of heat transfer and material compatibility in borehole sealing.
Implementation Method 1
locating a volume of thermite in the bore; initiating reaction of the volume of thermite to heat the volume of alloy
Implementation Method 2
bringing the volume of alloy to above the melting point of the alloy whereby the alloy flows
Implementation Method 3
compressing the thermite in the container
Implementation Method 4
facilitating efficient heat transfer
Data Source
AI summary
A downhole tool comprises a heater including a container enclosing a volume of compacted thermite. A volume of flowable alloy is provided above the heater. A fusible bulkhead may be provided between the heater and the alloy and provides for direct conduction of heat from the heater to the alloy. A housing containing the alloy may be separated from the heater by heating a fusible socket that anchors an end of a tensioned support member. The thermite may define an internal volume adapted to receive alloy. The heater may be activated to melt the alloy and the alloy may then solidify to form a bore-sealing plug.