Reciprocating Actuator for Multilateral Well Isolation Sleeve
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Solution Overview
Problem
Conventional multilateral well completions require multiple intervention trips to retrieve and re-install isolation sleeves, which increases rig time and system length, and lacks precise control over fluid flow between wellbores.
Innovation Solution
A reciprocating actuator system that shifts an isolation sleeve within the wellbore without complete removal, allowing precise control of the opening size to regulate fluid flow and reduce system length by using a longitudinally movable isolation sleeve with an engagement mechanism and driving mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional isolation sleeves are used that require complete removal and re-installation, then the isolation function is achieved, but the number of intervention trips increases and rig time is extended
Solution Approach 1:
The isolation sleeve is designed with dynamic positioning capability through the actuator system, allowing it to move between different positions (retracted to expose window, extended to block window) without requiring complete removal. This dynamic adjustment eliminates the need for multiple intervention trips while maintaining reliable isolation when needed.
Solution Approach 2:
The actuator system enables the isolation sleeve to be repositioned and retracted from within the wellbore using downhole actuation mechanisms, allowing the system to service itself without requiring surface intervention for each positioning change, thereby reducing rig time significantly.
2Reliability
If conventional isolation sleeves requiring complete removal are used, then isolation is achieved, but system length increases
Solution Approach 1:
The isolation sleeve is nested within the completion sleeve structure, allowing it to be stored in a retracted position within the window assembly when not in use. This nesting arrangement minimizes the overall system length by eliminating the need for long standalone isolation sleeves that would extend beyond the completion sleeve.
Solution Approach 2:
The dynamic repositioning capability allows the isolation sleeve to be compacted into a retracted position within the completion sleeve bore, significantly reducing the effective system length when isolation is not required, while still providing full isolation capability when extended.
3Reliability
If conventional isolation sleeves are used, then basic isolation is achieved, but precise control over fluid flow is lacking
Solution Approach 1:
The isolation sleeve can be dynamically positioned at multiple locations along its travel path, not just fully retracted or fully extended. This allows precise control over the exposed window area, enabling graduated control of fluid flow between wellbores rather than binary open/closed states.
Solution Approach 2:
The actuator system can partially extend or retract the isolation sleeve to expose only the necessary portion of the window for desired flow rates, rather than requiring complete exposure or complete closure. This partial action capability provides precise flow control.
Data Source
AI summary
A lateral wellbore access system is used for moving an isolation sleeve relative to a window of a completion sleeve to adjust access through the window. The system includes an actuator having an isolation sleeve engagement mechanism and a driving mechanism. The isolation sleeve engagement mechanism is configured to engage with an isolation sleeve. The driving mechanism is configured to longitudinally reciprocate the isolation sleeve relative to the isolation sleeve engagement mechanism within a bore of a completion sleeve to longitudinally move an isolation sleeve within the bore relative to a window of the completion sleeve. Movement of the isolation sleeve adjusts a position of the isolation sleeve relative to the completion sleeve window for permitting or blocking access through the window into the bore.