Controllably Releasable Shifting Tool for Downhole Actuator Retrieval
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Solution Overview
Problem
Existing shifting tools for formation isolation valves in well completions often become stuck, leading to tool damage and operational complications, with conventional emergency release mechanisms causing valve failure and requiring costly interventions.
Innovation Solution
A controllably releasable shifting tool with collet elements featuring a central deformable region of reduced thickness, allowing for predictable and controlled disengagement without damage, even under high loads, ensuring safe retrieval and maintaining valve functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional shifting tools are used to close formation isolation valves, then the valve can be shifted closed, but the tool may become stuck and cause tool damage or valve damage requiring costly interventions
Solution Approach 1:
The collet element incorporates a deformable region that allows controlled deformation under excessive load, enabling the tool to dynamically adapt to stuck conditions and release without damage. This dynamic feature transforms the rigid engagement into a controllable, reversible deformation mechanism.
Solution Approach 2:
The collet element's central region is designed with reduced thickness to change its mechanical parameters (strength, stiffness) in a predictable manner under load. This parameter change enables the element to deflect and release engagement when a predetermined force is exceeded, preventing tool damage while maintaining reliable operation under normal conditions.
2Ease of operation
If emergency release mechanisms are designed to allow tool removal, then tool retrieval is enabled, but the valve may become damaged and require costly interventions
Solution Approach 1:
The collet element is engineered with a specific thickness profile that changes its mechanical response at predetermined force levels. Under normal operation, the element maintains strong engagement, but when excessive force is applied, the reduced thickness central region deforms in a controlled manner to release engagement without damaging the valve mandrel.
Solution Approach 2:
The deformable region acts as a predetermined cushioning element that absorbs excessive force before it can transmit damage to the valve. This prior cushioning mechanism protects the valve from damage during emergency release operations.
3Strength
If the collet element is made stronger to prevent deformation, then tool integrity is maintained, but the tool cannot release in emergency situations
Solution Approach 1:
The collet element features non-uniform thickness distribution with a specifically thinned central region. This local quality change creates a controlled weak point that deforms predictably under excessive load, enabling emergency release while the thicker engagement and base portions maintain overall structural strength and integrity.
Solution Approach 2:
The collet element is effectively segmented into three functional regions (engagement portion, deformable central region, base portion) with different thicknesses and mechanical properties. This segmentation allows each region to perform its specific function: strong engagement, controlled deformation for release, and structural support.
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 enables reliable and damage-free emergency release, preventing tool breakage and valve damage, allowing for continued operation and reducing the need for costly interventions by applying substantial loads without compromising the valve's functionality.
Implementation Method 1
the deformable region is configured to deform in a predictable manner upon application of a predetermined force
Implementation Method 2
the engagement portion, the deformable region and the base portion are formed from a single piece of material
Data Source
AI summary
A shifting tool having a release mechanism of predictable deforming radial character. The tool may be utilized for activating any of a variety of different types of downhole actuators. Once more, due to the controlled and predictable manner of deformation employed in the release mechanism, load pulls directed at the actuator may be significant without undue concern over unintended or uncontrolled tool breakage. So, for example, a stuck actuator arm engaged with the shifting tool may be safely pulled at substantially greater loads thereby increasing the odds of dislodging. Thus, the occurrences of added follow-on interventional applications addressing stuck actuator arms may be reduced, resulting in tremendous time and cost savings.