Off-set Tubing Isolation Mandrel for Selective Wellbore Interval Control
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Solution Overview
Problem
Current ball and seat isolation systems face challenges in creating multiple wellbore intervals without requiring different inner diameters for each seat, limiting their ability to effectively isolate and treat various zones within a wellbore.
Innovation Solution
The system employs an isolation mandrel with an entry bore, transition chamber, and exit bore, where the transition chamber is radially enlarged, allowing an isolation device of predetermined length to selectively pass through or block fluid flow based on its length, enabling the creation of multiple wellbore intervals regardless of the tubing string's inner diameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional ball and seat isolation systems are used to create multiple wellbore intervals, then isolation of different zones is achieved, but the system requires different inner diameters for each seat which limits flexibility
Solution Approach 1:
The isolation device is nested within the isolation mandrel during deployment. The mandrel acts as a temporary carrier that guides the isolation device to its deployment location, then the device is released to perform its isolation function while the mandrel continues down the wellbore. This nesting approach eliminates the need for different inner diameters at different depths.
Solution Approach 2:
The isolation mandrel serves as an intermediary component between the isolation device and the wellbore. It provides a uniform diameter conduit that transports multiple isolation devices of varying lengths to their respective deployment locations, mediating the conflict between device diversity and conduit uniformity.
2Ease of manufacture
If the tubing string maintains a uniform inner diameter throughout, then ease of installation and manufacturing is improved, but the ability to selectively isolate multiple intervals is limited
Solution Approach 1:
The isolation device is segmented into modular components with standardized connectors. Each isolation device can be configured with different lengths by assembling different numbers of modular sections, allowing selective isolation at various depths while maintaining uniform tubing diameter throughout the wellbore.
Solution Approach 2:
The isolation device incorporates expandable elements that transition from a compact configuration during transport through the uniform diameter tubing to an expanded configuration at the deployment location. This dynamic transformation enables the device to perform its isolation function without requiring the tubing to change diameter.
Data Source
AI summary
A system and method for selective isolation of multiple wellbore intervals that can include an isolation mandrel interconnected in a tubing string, where the isolation mandrel includes an entry bore, a transition chamber, and an exit bore, the transition chamber being positioned between the entry and exit bores, and the transition chamber being radially enlarged relative to the entry and exit bores. An isolation device, with a predetermined length, is displaced through the tubing string to the isolation mandrel, where the length of the isolation device relative to a length of the isolation mandrel can determine if the isolation device passes through the isolation mandrel or lands in the isolation mandrel.