Thermite-Polymer Power Source for Subsurface Tool Actuation
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Solution Overview
Problem
Conventional explosive power charges used for actuating subsurface tools face challenges such as excessive force, short duration of pressure, regulatory difficulties in transport and use, and heat-induced tool degradation, which hinder effective and safe operation in well operations.
Innovation Solution
A non-explosive power source utilizing thermite and a polymer that produces gas upon ignition, providing continuous pressure and controlled heat transfer to actuate subsurface tools without the drawbacks of explosive devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional explosive power charges are used to actuate subsurface tools, then sufficient force is provided to set the tool, but the force duration is too short and excessive heat is generated causing tool degradation
Solution Approach 1:
The invention changes the chemical composition and reaction characteristics of the power source from conventional explosive materials to a thermite-based composition with iron oxide and aluminum powder. This parameter change transforms the rapid combustion into a controlled exothermic reaction that generates sustained mechanical force over an extended duration, providing both sufficient magnitude and prolonged action for reliable tool actuation
Solution Approach 2:
The power source employs a composite material system combining thermite mixture (iron oxide and aluminum powder) with a magnesium bridge initiator and binding agents. This composite structure enables sequential energy release: the magnesium bridge provides initial ignition, followed by sustained thermite reaction, creating a multi-stage force profile that maintains pressure throughout the actuation process
2Force
If conventional explosive power charges are used, then tool actuation is achieved, but heat transfer to the tool causes degradation and reduced reliability
Solution Approach 1:
The invention introduces a steel cup or container as an intermediary thermal management component between the thermite power source and the subsurface tool. This intermediary structure controls heat transfer by containing the thermite reaction and directing thermal energy away from the tool, preventing degradation while maintaining sufficient mechanical force for actuation
Solution Approach 2:
The invention converts the potentially harmful excessive heat of conventional explosives into a beneficial controlled thermal profile. The thermite reaction's exothermic nature is harnessed to provide sustained heating that maintains reaction integrity and force generation over time, while the steel cup intermediary directs this thermal energy to sustain the reaction without damaging the tool
3Force
If explosive power charges are used for tool actuation, then the tool can be set, but shockwaves are created that can move and damage other tools and components in the wellbore
Solution Approach 1:
The invention converts the harmful shockwave generation of conventional explosives into a beneficial controlled mechanical force. The thermite-based power source transforms rapid combustion into a sustained exothermic reaction that generates continuous pushing force without creating destructive shockwaves, thereby protecting other wellbore tools and components while maintaining effective actuation capability
4Ease of operation
If explosive devices are transported to remote well locations, then power charges can be deployed, but regulatory requirements and transport costs increase significantly
Solution Approach 1:
The invention extracts the explosive component from the power source system, replacing it with a non-explosive thermite-based composition. This extraction eliminates the need for special explosive transport regulations, special permits, and licensed handling requirements, while retaining the essential function of providing controlled force for tool actuation in remote locations
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 thermite-polymer power source offers a continuous, controlled pressure that can realign misaligned tools and improve actuation quality, reducing heat transfer and regulatory burdens, while providing pressure equal to or exceeding conventional explosive power charges.
Implementation Method 1
thermite, present in a quantity sufficient to generate a thermite reaction when heated in excess of an ignition temperature
Implementation Method 2
a polymer disposed in association with the thermite and producing gas when the thermite reaction occurs
Data Source
Figure 1~2
AI summary
A power source for actuating a subsurface tool is described herein, the power source comprising thermite in a quantity sufficient to generate a thermite reaction, and a polymer disposed in association with the thermite. The polymer produces a gas when the thermite reaction occurs, the gas slowing the thermite reaction. The slowed thermite reaction enables a continuous pressure to be provided to the subsurface tool over a period of time, providing superior actuation over a conventional explosive power charge, through a non-explosive reaction.