Shifting Sleeve Mechanical Lockout for Wellbore Positioning
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Solution Overview
Problem
In wellbore operations, shifting sleeves in completion strings are prone to being bumped or dislodged by service tools, especially in multi-zone wells, leading to uncertainty about their open or closed status, which can result in unintended re-opening during well operations.
Innovation Solution
The implementation of a mechanical lockout feature for shifting sleeves, which includes a threaded profile on the sleeve and housing for torque-based locking, along with a shifting profile and key for controlled movement and locking, ensuring the sleeve can be reliably locked in a closed position using a specially-profiled shifting tool.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a collet is used to hold the sleeve, then the sleeve can be positioned in place, but the sleeve remains susceptible to being bumped or dislodged by service tools
Solution Approach 1:
The sleeve is pre-equipped with a threaded profile and locking features that engage with the housing before the sleeve is shifted to its final position. This preliminary configuration ensures that when the sleeve is moved, it automatically locks into place, preventing accidental dislodgement by service tools while maintaining relatively simple device architecture
Solution Approach 2:
A threaded profile acts as an intermediary mechanism between the sleeve and housing. This threading feature provides a reliable mechanical engagement that secures the sleeve in position, while the interaction between the threaded profile and corresponding threads in the housing creates a secure connection that resists accidental movement without requiring complex additional locking components
2Adaptability or versatility
If the sleeve is made movable for service operations, then flexibility in well operations is improved, but the risk of accidental re-opening increases
Solution Approach 1:
The sleeve system transitions from a static fixed position to a dynamic movable position during service operations, then locks into a stable final position. The threaded profile enables controlled movement when needed while providing automatic locking when the sleeve is shifted, allowing the system to adapt between mobility and stability based on operational requirements
Solution Approach 2:
The mechanical state of the sleeve changes from unlocked to locked through application of torque to the threaded profile. This parameter change (from movable to locked state) provides operational flexibility during service operations while ensuring position stability during production, allowing the same sleeve to serve multiple functional states
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
This solution provides a reliable mechanism to lock shifting sleeves in place, preventing accidental re-opening and ensuring the integrity of well operations by allowing controlled opening and closing during well operations while maintaining the sleeve in a locked position when not in use, enhancing operational certainty in multi-zone wells.
Implementation Method 1
application of pressure or torque or both to the shifting profile of the shifting sleeve causes movement of the shifting sleeve and a mechanical lock with the housing
Implementation Method 2
a mechanical lock with the housing
Data Source
AI summary
Certain aspects are directed to devices designed to lock shifting sleeves. In a particular aspect, there is provided a shifting sleeve with a mechanical lockout feature, comprising: a shifting sleeve comprising a shifting profile and a locking feature; a housing comprising a corresponding locking feature, wherein application of pressure or torque or both to the shifting profile of the shifting sleeve causes movement of the shifting sleeve and a mechanical lock with the housing.