Hydraulically Actuated Standoffs for Downhole Tools
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Solution Overview
Problem
Downhole tools face challenges in preventing differential sticking within boreholes, as existing standoffs and centralizers can increase the tool's diameter, leading to potential sticking issues and difficulty in removal without damage.
Innovation Solution
Hydraulically actuated standoffs that deploy and retract uniformly in response to a hydraulic control signal, using a serially coupled piston system to ensure consistent extension and retraction, thereby centralizing the tool and preventing sticking, and can be optimized for specific borehole diameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standoffs and centralizers are added to prevent differential sticking, then tool sticking prevention is improved, but the tool envelope (outer diameter) increases
Solution Approach 1:
The standoffs are designed to be dynamically extendable and retractable rather than fixed. They can be extended when needed to prevent sticking and retracted when not needed to minimize tool envelope, allowing the same device to adapt to different operational requirements and resolve the contradiction between sticking prevention and tool size
Solution Approach 2:
The standoff system is divided into multiple independent segments that can be selectively deployed. Each standoff can be independently extended or retracted based on local conditions, providing sticking prevention only where and when needed, thus preventing full tool envelope increase
2Adaptability or versatility
If extendable/retractable portions are added to adjust centralizer for different borehole diameters, then adaptability is improved, but device complexity increases
Solution Approach 1:
Hydraulic actuators are used to control the extension and retraction of standoffs and centralizer elements. This provides smooth, controlled adjustment capability for different borehole diameters while using compact hydraulic components rather than complex mechanical adjustment mechanisms
Solution Approach 2:
The centralizer incorporates dynamically adjustable elements that can change their configuration based on operational requirements. The ability to extend and retract components provides adaptability to different borehole sizes without requiring multiple fixed-size centralizers
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 hydraulically actuated standoffs effectively prevent differential sticking by ensuring uniform deployment and retraction, allowing for safe tool operation in various borehole sizes without increasing the tool's diameter, thus facilitating easy removal and minimizing the risk of damage.
Implementation Method 1
a hydraulic circuit operatively coupled to the standoffs, the hydraulic circuit including a plurality of hydraulically actuated pistons
Data Source
AI summary
Hydraulically actuated standoffs for downhole tools are described. An example apparatus includes a downhole tool having a body defining an outer surface and a plurality of standoffs distributed about the outer surface. The example apparatus also includes a hydraulic circuit operatively coupled to the standoffs. The hydraulic circuit includes a plurality of hydraulically actuated pistons, each of which is operatively coupled to a respective one of the standoffs to extend and retract the respective standoff. The pistons are hydraulically coupled and sized to extend or retract the respective standoffs at substantially the same rate in response to a hydraulic control signal.