Stackable Reentry Window Assembly for Multilateral Wellbore Access
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Solution Overview
Problem
Multilateral well systems require frequent intervention trips for maintenance of multiple lateral wellbores, which increases operational costs and reduces efficiency due to the need for multiple reentry window assemblies and telescoping isolation sleeves.
Innovation Solution
The implementation of a reentry window assembly system that allows for the stacking of multiple assemblies in a parent wellbore, utilizing a whipstock assembly with selective latch keys and an aligning tool to angularly orient the whipstock, and an isolation sleeve with a sleeve alignment key that interacts with upper and lower slots to maintain orientation, enabling the isolation sleeve to move between closed and open positions without removing upper isolation sleeves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple reentry window assemblies with telescoping isolation sleeves are installed in a parent wellbore, then access to multiple lateral wellbores is enabled, but the number of intervention trips increases due to the need to remove upper isolation sleeves to access lower lateral wellbores
Solution Approach 1:
Multiple reentry window assemblies are stacked vertically within the parent wellbore, with each assembly containing an isolation sleeve that can be independently actuated. The nested configuration allows lower isolation sleeves to be accessed and operated without removing upper isolation sleeves, as each sleeve is contained within its own reentry window assembly. This resolves the contradiction by enabling independent access to multiple lateral wellbores while eliminating the need for repeated intervention trips.
Solution Approach 2:
The system divides the parent wellbore into multiple independent reentry window assemblies, each with its own isolation sleeve and control mechanism. This segmentation allows each lateral wellbore to be accessed and isolated independently, enabling maintenance operations on lower lateral wellbores without affecting or requiring removal of upper isolation sleeves. The segmented design directly reduces the number of intervention trips needed.
2Device complexity
If isolation sleeves are made telescoping to allow nested installation, then device complexity is reduced, but maintaining precise angular orientation of multiple isolation sleeves becomes difficult
Solution Approach 1:
An aligning tool with a whipstock serves as an intermediary device that interfaces with each reentry window assembly during installation. The aligning tool engages with features on the isolation sleeve and completion window to precisely set the angular orientation before the isolation sleeve is actuated into its final position. This intermediary alignment mechanism ensures that multiple isolation sleeves maintain correct angular orientation relative to their respective lateral wellbores, even in the complex nested configuration.
Solution Approach 2:
The angular orientation of each isolation sleeve is established during the initial installation process using the aligning tool and whipstock, before the isolation sleeve is actuated into its operational position. This preliminary alignment action ensures that precise angular orientation is set once during installation, eliminating the need for complex real-time adjustment mechanisms and maintaining orientation accuracy throughout the nested configuration.
3Adaptability or versatility
If multiple reentry window assemblies are stacked in a parent wellbore, then access to multiple lateral wellbores is enabled, but the device complexity increases due to additional assemblies and components
Solution Approach 1:
Each reentry window assembly is designed as a universal, modular unit that can be replicated and stacked multiple times within the parent wellbore. The assemblies use standardized components including the isolation sleeve, completion window, and coupling mechanisms, allowing them to be installed in series without requiring different designs for each location. This universality enables access to multiple lateral wellbores while controlling device complexity through component standardization and modularity.
Data Source
AI summary
A well system including a parent wellbore, a lateral wellbore extending from the parent wellbore, and a reentry window assembly installed within the parent wellbore and including a completion window assembly having a window and providing an upper coupling, a muleshoe, and upper and lower slots provided on opposing axial ends of the window. An isolation sleeve is positioned within the completion window assembly and includes a sleeve alignment key, a sleeve coupling, and an engagement device. A whipstock is matable with the sleeve coupling and an aligning tool is operatively coupled to the whipstock and engageable with the muleshoe to angularly orient a whipstock face to the window. The isolation sleeve is movable between closed and open positions to isolate the lateral wellbore, and the sleeve alignment key interacts with the upper and lower slots to angularly orient the isolation sleeve while moving between the first and second positions.