Untethered Downhole Tool Orientation via Mass and Magnetism
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Solution Overview
Problem
Conventional downhole tools with high aspect ratios face limitations in yaw and pitch movements within a wellbore, and rely on centralizers or decentralizers that can cause jamming, especially when transitioning between different casing sizes, limiting their positional freedom and measurement accuracy.
Innovation Solution
An untethered downhole tool with a body that includes mass components such as buoyant and ballast portions, and magnets to adjust its orientation independently within the wellbore, allowing it to move without a conveyance and align with the casing, reducing drag forces and enhancing sensor signal amplitude by strategic positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If centralizers or decentralizers are used to constrain wireline tools, then positional freedom is limited, but measurement accuracy and operational flexibility improve
Solution Approach 1:
The patent removes centralizers and decentralizers from the tool assembly, extracting the problematic constraint mechanism entirely. The tool operates freely in the wellbore without these auxiliary components, eliminating the trade-off between positional freedom and measurement accuracy that plagues conventional designs.
Solution Approach 2:
The downhole tool autonomously maintains its orientation and position through its own design features (such as asymmetric buoyancy elements or magnetic alignment) rather than relying on external constraint devices. This self-service capability provides both positional freedom and measurement accuracy simultaneously.
2Stability of the object's composition
If wireline tools with high aspect ratio are used, then structural stability is improved, but ability to yaw and pitch within three-dimensional space is limited
Solution Approach 1:
The patent employs dynamic orientation mechanisms that allow the tool to actively adjust its yaw and pitch angles in response to wellbore conditions. Rather than being constrained by a fixed high aspect ratio geometry, the tool can dynamically reorient itself while maintaining structural integrity through controlled flexibility or active stabilization systems.
Solution Approach 2:
The invention introduces additional degrees of freedom by enabling rotation and orientation changes in multiple dimensions. The tool transitions from being constrained to primarily axial movement to having full three-dimensional mobility, achieving both structural stability and adaptability through enhanced dimensional freedom.
3Adaptability or versatility
If untethered downhole tool is used to move independent of conveyance, then operational flexibility is improved, but control over orientation becomes more difficult
Solution Approach 1:
The untethered tool incorporates sensors and control systems that provide real-time feedback on its orientation and position. This feedback loop enables autonomous adjustment of orientation through active control mechanisms (such as adjustable buoyancy elements, magnetic alignment, or reaction wheels), making the tool both operationally flexible and easily controllable despite operating independently of any conveyance.
Solution Approach 2:
The patent replaces mechanical connection to conveyance with non-mechanical control methods such as magnetic field interaction, hydrodynamic forces, or electromagnetic actuation. This substitution maintains operational flexibility of untethered operation while enabling precise orientation control through field-based actuation rather than mechanical linkage.
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 can maintain favorable orientations without centralizers, resist rotational forces, and pass through complex profiles, improving measurement accuracy and operational flexibility within the wellbore.
Implementation Method 1
the at least one mass includes a buoyant portion positioned within, or attached to, a first location of the body; and a ballast portion positioned within, or attached to, a second location of the body
Implementation Method 2
the one or more forces includes a buoyant force and a gravitational force
Implementation Method 3
the at least one magnet is positioned within the body to align, with a magnetization force, the body with a casing, the at least one magnet including a casing collar locator
Data Source
AI summary
A downhole tool includes a body configured to move in a wellbore formed from a terranean surface to a subterranean formation in a direction downhole of the terranean surface independent of a downhole conveyance attached to the body; one or more sensors positioned in the body, the one or more sensors configured to measure a value associated with at least one of the wellbore or the terranean surface; and at least one mass positioned in the body and configured to adjust an orientation of the body in response to one or more forces acting on the body as the downhole tool moves in the wellbore in the direction downhole of the terranean surface.