Segmented Downhole Heating Tool for Restricted-Access Wellbores
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Solution Overview
Problem
Existing downhole heating tools struggle to deliver sufficient heat energy to large volumes of eutectic or bismuth alloys in wellbores with large diameters and lengths, particularly in well geometries with restricted access, limiting the ability to form effective plugs or seals.
Innovation Solution
A downhole heating tool comprising multiple discrete tubular heating units linked by flexible connections that allow relative movement, enabling an expanded heating footprint by transitioning from a compact deployment configuration to an enlarged heating configuration, optimizing heat delivery without increasing the tool's profile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a single large diameter heater is used to deliver heat energy to large volumes of alloy in large diameter wellbores, then the heating capacity is sufficient, but the tool cannot be deployed in well geometries with restricted access
Solution Approach 1:
The heating tool is divided into multiple discrete tubular heating units (first heating unit, second heating unit, etc.) that can be deployed separately. Each heating unit is independent and can be run through restricted diameter tubing, yet collectively they provide sufficient heating capacity for large volume alloy melts in large diameter wellbores.
Solution Approach 2:
The heating units are arranged radially around the central axis of the wellbore in a circular pattern. This radial arrangement allows the heating action to extend in multiple dimensions (radially outward from the central axis), providing comprehensive heating coverage for large volume alloy without requiring a single large diameter heater.
2Power
If multiple heating units are arranged radially around the central axis to provide expanded heating footprint, then the heating capacity for large volume alloy is sufficient, but the tool profile increases making deployment difficult
Solution Approach 1:
The heating units are connected by flexible links that allow relative movement between units. This dynamic connection enables the heating units to adjust their positions and maintain optimal spacing around the central axis during deployment, while allowing the tool to pass through restricted diameter tubing when needed.
Solution Approach 2:
Flexible links connect the heating units, allowing them to move relative to each other. This flexibility enables the heating units to be compact during deployment (passing through restricted tubing) and then expand to their full radial arrangement once deployed, providing the necessary heating footprint without permanent increase in tool profile.
3Area of stationary object
If the heating tool uses multiple discrete heating units linked by flexible connections, then the heating footprint is expanded, but the structural complexity increases
Solution Approach 1:
Each heating unit is identical and can function independently or in conjunction with other heating units. The flexible links serve multiple functions: connecting heating units, allowing relative movement, maintaining radial arrangement, and enabling compact deployment. This multi-functionality reduces the need for additional specialized components.
Solution Approach 2:
The heating tool is segmented into identical modular heating units that can be independently manufactured and assembled. This segmentation simplifies the overall design by using repeated standardized components rather than a single complex integrated structure, making the multiple-unit system more manageable despite the increased number of components.
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 solution allows for the formation of large diameter alloy plugs or seals in challenging well geometries, accommodating various well fluids and enabling the use of higher melting point alloys, even in restricted access conditions, with enhanced flexibility and efficiency in heat delivery.
Implementation Method 1
The heating tools of the present invention, which preferably employ chemical heat sources that comprises thermite or a thermite blend
Implementation Method 2
melted at the target depth, and allowed to cool to a solid state
Data Source
AI summary
The present invention provides a downhole heating tool with an increased heating capacity for use in setting alloy plugs/seal in downhole target regions of wellbores, such as oil/gas wells. The increased heating capacity enables greater quantities of alloy to be melted in one operation. It also enables alloys with higher melting points to be melted in the downhole environment. To this end the heating tool comprises a plurality of discrete tubular heating units linked together by connection means that permit the movement of the tubular heating units relative to one another. The relative freedom of movement between the heating units facilitates a transition between a deployment configuration, in which the heating tool is optimised for deployment downhole, and a heating configuration, in which the heating tool adopts an expanded heating footprint within a downhole target region.