Multiple-Position Mechanical Shifting Tool for Wellbore Valve Control
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Solution Overview
Problem
Current shifting tools for mechanical sliding sleeve valves in hydrocarbon wells can only position the valve in two distinct states, fully open or fully closed, lacking the capability to manage multiple positions, which is necessary for efficient fluid flow control and pressure equalization.
Innovation Solution
A novel multiple-position shifting system that includes a shifting tool with a radially expandable and retractable key and a reciprocating assembly, allowing the internal sliding sleeve to be selectively positioned at various spatial locations relative to the outer valve body, enabling multiple operational positions, including fully opened, fully closed, and intermediate positions, by adjusting the distance between the actuating means and the release shoulder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional shifting tool is used to position the sliding sleeve valve, then the valve can be positioned in fully open or fully closed positions, but the valve cannot be positioned at intermediate positions for pressure equalization or multi-position control
Solution Approach 1:
The shifting tool key is divided into multiple engagement surfaces at different axial positions, each capable of engaging with corresponding surfaces on the sliding sleeve at different locations. This segmentation allows the single key structure to provide multiple discrete positioning points (fully open, intermediate, fully closed) without requiring multiple separate tools or complex mechanisms.
Solution Approach 2:
The shifting tool key incorporates a radial expansion mechanism that allows it to transition between retracted and expanded states. When expanded, the key engages with the sliding sleeve at specific positions; when retracted, it disengages. This dynamic capability enables the tool to provide multiple discrete positions through a single mechanical action sequence.
2Ease of operation
If the shifting tool key is always engaged with the sliding sleeve, then the valve position is stable, but the tool cannot be released or repositioned
Solution Approach 1:
The shifting tool key uses a radial expansion mechanism that can be actuated to transition between engaged and disengaged states. The key expands radially to engage with the sliding sleeve for stable positioning, then contracts to release, allowing the tool to be repositioned or removed. This dynamic engagement provides both stability during operation and ease of manipulation during setup.
Solution Approach 2:
The radial expansion mechanism acts as an intermediary between the shifting tool and the sliding sleeve. It provides a controllable engagement interface that can be activated to secure the valve in position and deactivated to release it, mediating between the need for stable positioning and the need for tool manipulability.
3Adaptability or versatility
If the shifting tool uses a simple engagement mechanism, then the tool structure is simple, but it cannot provide multiple discrete positioning points along the sliding sleeve
Solution Approach 1:
The shifting tool key features multiple discrete engagement surfaces positioned at different axial locations, each capable of engaging with corresponding surfaces on the sliding sleeve. This segmentation of the engagement interface allows the tool to provide multiple discrete positioning points (fully open, intermediate positions, fully closed) using a single unified key structure, achieving positioning precision without requiring complex multi-component mechanisms.
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 control of fluid flow and pressure management by allowing the sliding sleeve to be positioned at multiple points, enhancing operational flexibility and reducing pressure surges during valve operation.
Implementation Method 1
The shifting tool key may be radially expandable to engage the internal sliding sleeve to enable shifting of the internal sliding sleeve relative to the outer valve body
Implementation Method 2
The outer housing may have a biasing means to reciprocate the outer housing in a first direction during the valve shifting operations
Implementation Method 3
The outer housing may also have an actuating means to cause reciprocation of the outer housing in a second direction during said valve release operations
Data Source
AI summary
A multiple-positioning mechanical shifting system including for used in hydrocarbon wells. The system includes a shifting tool capable of selectively positioning a mechanical sliding sleeve valve in multiple operational positions that varying the flow rate and/or volume of tubing string fluid flowing to the well annulus. The system also includes a multiple position mechanical choke valve. A method of operating the mechanical choke valve using the shifting tool is described.