Mineral-Insulated Downhole Heater for Precise Eutectic Plugging
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Solution Overview
Problem
Existing methods for applying eutectic metal alloys to seal fractures in wells are inaccurate and require multiple heater replacements, lacking precise control over heating and placement.
Innovation Solution
A downhole plugging assembly using a mineral insulated heater with a metallic alloy core and magnesium oxide insulation, surrounded by a stainless steel sheath, is used to accurately deliver and melt eutectic metal alloy particles or suspension in carrier fluid directly to the fracture site, allowing for controlled melting and solidification to form a plug.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If thermite heaters are used to melt eutectic metal alloys, then the metal can be melted and deposited, but the heating process lacks precision and requires multiple heater replacements
Solution Approach 1:
The patent introduces a mineral-insulated electric heater as an intermediary heating device that provides precise thermal control. This heater acts as a mediator between the power source and the eutectic metal alloy, enabling accurate melting and placement without requiring multiple thermite heater replacements. The mineral insulation ensures heat is directed precisely where needed.
Solution Approach 2:
The patent replaces the mechanical/chemical thermite heater system with an electrical heating system. This substitution allows for precise control of the melting process through electrical power regulation, eliminating the need for manual heater replacement operations and improving placement accuracy.
2Manufacturing precision
If eutectic metal alloy is melted and deposited to seal fractures, then the fracture can be sealed, but the existing methods do not place the metal accurately close to the heat source
Solution Approach 1:
The patent applies local quality by concentrating the heating function at the precise location where the eutectic metal alloy needs to be melted and deposited. The mineral-insulated heater is positioned to provide localized thermal energy exactly at the fracture site, ensuring accurate deposition and effective sealing without affecting surrounding areas.
Solution Approach 2:
The patent employs preliminary action by pre-positioning the mineral-insulated heater at the target location before activating it to melt the eutectic metal alloy. This ensures the heater is already in the optimal position for accurate deposition, eliminating the need for subsequent adjustments or replacements.
3Productivity
If multiple thermite heaters are used for repeated treatments, then more fractures can be sealed, but the process requires repeated heater installations increasing time and complexity
Solution Approach 1:
The mineral-insulated electric heater serves as a universal heating device that can be used for multiple fracture sealing treatments. Once installed, it can repeatedly melt and deposit eutectic metal alloy for multiple fractures along the wellbore, eliminating the need for repeated heater installations and improving overall productivity.
Solution Approach 2:
The patent enables continuous useful action by using a single mineral-insulated heater that can continuously melt and deposit eutectic metal alloy for multiple fracture treatments. This continuous operation eliminates the downtime associated with removing and replacing thermite heaters between treatments.
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 precise placement and repeated use of eutectic metal alloys to seal fractures, reducing the need for repeated heater installations and ensuring effective fracture sealing without obstructing the well's main path.
Implementation Method 1
The mineral insulated heater includes a metallic alloy inner core... activating the mineral insulted heater to melt the eutectic metal alloy particles
Implementation Method 2
a magnesium oxide insulation surrounded by a stainless steel sheath
Implementation Method 3
The mineral insulated heater is deactivated after the eutectic metal alloy particles have melted to allow the melted eutectic alloy to cool, forming a eutectic metal plug
Data Source
AI summary
A method for sealing a section of a well with a downhole plugging assembly using a basket containing a mineral insulated heater by running the downhole plugging assembly through the well and activating the mineral insulated heater. The heater melts the eutectic metal alloy to fill the downhole location with the melted alloy. The mineral insulated heater is deactivated and the melted eutectic alloy cools to form a plug. A method for sealing a section of a well using a downhole plugging assembly containing a carrier fluid and a mineral insulated heater. The method includes running the downhole plugging assembly into the well, flowing the eutectic alloy suspended in the carrier fluid, connecting the electrical connection to a power source, and activating the mineral insulated heater to melt the eutectic alloy to fill the downhole location. The method includes allowing the eutectic alloy to cool to form a eutectic plug.