Retrievable Liner Junction Isolation
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Solution Overview
Problem
Existing wellbore junctions are vulnerable to fracturing pressure during the completion of wellbore construction, and current isolation methods are either large or implemented after the well system is completed.
Innovation Solution
A retrievable liner assembly with an isolation mechanism is used to isolate the junction from fracturing pressure by extending from one bore through a junction into a lateral bore, allowing at least a portion of the liner to be removed prior to wellbore construction completion, utilizing a whipstock, packers, and disconnect mechanisms for pressure isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a liner assembly with isolation mechanism is used to isolate the junction from fracturing pressure, then the junction is protected from fracturing pressure, but the device size increases and requires more space in the wellbore
Solution Approach 1:
The isolation mechanism is nested within the liner body structure. The packer assembly is positioned inside the liner, and the disconnect mechanism is integrated into the liner wall thickness, allowing the isolation function to be contained within the existing liner footprint rather than requiring additional external components.
Solution Approach 2:
The liner body acts as a flexible barrier that can be positioned against the wellbore wall to provide isolation. The thin film nature of the liner allows it to provide pressure containment while occupying minimal space, with the isolation mechanism utilizing the liner's structural flexibility to achieve sealing without adding significant volume.
2Loss of time
If the liner assembly is made retrievable prior to wellbore construction completion, then rig time is saved and operational flexibility is improved, but the device complexity increases
Solution Approach 1:
The liner assembly transitions from a static permanent structure to a dynamic removable structure. The disconnect mechanism allows the liner to be selectively retained or removed based on operational needs, providing temporal flexibility. This dynamic capability enables the liner to serve its isolation function during fracturing operations and then be retrieved to allow completion activities, optimizing the construction timeline.
Solution Approach 2:
The liner assembly is segmented into modular components including the liner body, isolation mechanism, and disconnect mechanism. This segmentation allows each component to perform its specific function independently while maintaining overall system retrievability. The modular design simplifies the retrieval process by allowing controlled disconnection at predetermined interfaces without requiring complete assembly removal procedures.
3Strength
If the isolation mechanism is placed exterior to part of the liner body, then the liner can provide structural support, but the overall device size and complexity increase
Solution Approach 1:
The liner body and isolation mechanism are merged into an integrated assembly where the liner provides both structural support and isolation functions. The exterior positioning of the isolation mechanism allows it to utilize the liner's structural framework for support while maintaining independent sealing capability. This merging eliminates the need for separate structural and isolation components, reducing overall system complexity despite the exterior placement.
Data Source
AI summary
A junction can be isolated from fracturing pressure using a liner extending from a one bore through a junction into a lateral bore, where at least a portion of the liner is retrievable from the lateral bore prior to completion of wellbore construction. The junction may be temporarily isolated from high pressure, such as high pressure from a fracturing stimulation process. Part of the liner can be retrieved using a disconnect mechanism or technique.