Wellbore Liner and Completion Assembly for Multi-Zone Production
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Solution Overview
Problem
Conventional single trip, multi-zone liners in wellbores have a small internal diameter, making it difficult to position a completion assembly, which reduces fluid production rates when trying to fit the assembly within the liner.
Innovation Solution
A liner assembly with a formation isolation valve, first and second frac valves, and a completion assembly that includes flow control valves and a valve shifting tool to actuate the frac valves and isolation valve, allowing for efficient fracturing and fluid flow from multiple zones within the wellbore.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the internal diameter of the completion assembly is reduced to fit within a conventional liner, then the completion assembly can be positioned within the liner, but the fluid production rate is reduced
Solution Approach 1:
The completion assembly is positioned within the liner in a nested configuration, allowing both components to coexist in the wellbore without requiring reduction of the completion assembly's internal diameter. The liner serves as an outer containment structure while the completion assembly maintains its full internal diameter for optimal fluid flow.
2Productivity
If a larger completion assembly is used to maintain fluid flow rates, then productivity is improved, but it becomes difficult to position within the conventional liner
Solution Approach 1:
The system employs a nested arrangement where the completion assembly with its larger internal diameter is positioned within the liner. This nesting approach allows the completion assembly to maintain its full size for high productivity while the liner provides the necessary containment and structural support within the wellbore.
3Adaptability or versatility
If multiple zones are fractured using conventional liners, then multi-zone production is achieved, but the small internal diameter limits completion assembly options
Solution Approach 1:
The liner containing multiple frac valves for zonal isolation is nested with the completion assembly inside. This nested configuration allows the completion assembly to access multiple zones through the liner's frac valves while maintaining its full internal diameter, enabling both multi-zone fracturing and optimal fluid flow.
Solution Approach 2:
The liner serves multiple functions: it provides structural containment, houses frac valves for multi-zone isolation, and accommodates the completion assembly. This multi-functional design enables versatile well completion operations without compromising fluid flow capacity.
Data Source
AI summary
Systems and methods for producing from multiple zones in a subterranean formation are provided. The system can include a liner including a first frac valve, a second frac valve, and a formation isolation valve. The second frac valve can be positioned above the first frac valve, and the formation isolation valve can be positioned above the second frac valve. A completion assembly can be disposed at least partially within the liner. The completion assembly can include a valve shifting tool adapted to actuate the formation isolation valve between an open position and a closed position. The completion assembly can also include a first flow control valve in fluid communication with the first frac valve and a second flow control valve in fluid communication with the second frac valve.