Degradable Plug Wellbore Junction Isolation
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Solution Overview
Problem
In multilateral wellbore operations, there is a need for effective temporary isolation of wellbores from pressure and debris during production and maintenance operations to prevent fluid flow and contamination, which existing solutions fail to address efficiently.
Innovation Solution
The use of an isolation sleeve and deflector system that forms fluid and pressure tight seals at the intersection of main and lateral wellbores, with an optional degradable plug mechanism to allow for temporary isolation and subsequent resumption of fluid flow by mechanical or chemical means.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a permanent seal is used to isolate wellbores, then reliability of isolation is improved, but ease of operation deteriorates due to inability to resume flow
Solution Approach 1:
The plug is designed to transition from a static sealed state to a dynamic open state through degradation. The degradable material allows the plug to maintain seal integrity during isolation operations, then progressively degrade to open the flow path when resumption is needed, providing dynamic adaptability between isolation and production modes
Solution Approach 2:
The plug material properties change over time through degradation processes. The degradable material undergoes parameter changes in strength, density, and structural integrity, transitioning from a rigid sealing configuration to a compromised state that allows fluid flow, enabling automatic flow resumption without intervention
2Ease of operation
If a degradable plug is used to allow flow resumption, then ease of operation is improved, but reliability of isolation deteriorates due to potential premature degradation
Solution Approach 1:
The plug exhibits different degradation characteristics in different locations and conditions. The degradable material is designed to resist degradation under normal wellbore conditions (maintaining isolation reliability) but degrades when exposed to specific triggers such as acid stimulation fluids or thermal conditions, providing localized and condition-dependent quality changes
Solution Approach 2:
The plug is designed as a disposable, degradable component that sacrifices its structural integrity after serving its isolation function. The degradable material is intentionally designed to be short-lived and disposable, degrading predictably to open flow paths without requiring retrieval or replacement operations
3Productivity
If isolation components are made degradable, then ease of repair deteriorates due to material degradation, but productivity is improved through automatic flow resumption
Solution Approach 1:
The plug is designed as a disposable, degradable component that sacrifices its structural integrity after serving its isolation function. The degradable material is intentionally designed to be short-lived and disposable, degrading predictably to open flow paths without requiring retrieval or replacement operations
Solution Approach 2:
The degradation process is self-service and automatic. The plug degrades autonomously in response to wellbore conditions or operational triggers, automatically opening flow paths without requiring human intervention, retrieval operations, or complex repair procedures, thereby improving productivity while accepting reduced component durability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables temporary isolation of wellbores to prevent pressure and debris contamination, ensuring safe and efficient operations while allowing for easy resumption of fluid flow when needed, enhancing operational control and reducing maintenance costs.
Implementation Method 1
The plug may be formed of a degradable composition including a metal or alloy that is reactive under defined conditions. A chemical or electrochemical reaction causing the plug to degrade may be triggered
Implementation Method 2
an isolation sleeve and deflector that seals to the junction may be used to temporarily prevent the flow of fluid into or out of the isolated wellbore
Implementation Method 3
The composition of the particles may be selected such that the metal from which the particles are formed has a different galvanic potential than the metal or alloy in which they are imbedded. Contact between the particles and the metal or alloy in which they are imbedded may trigger microgalvanic corrosion
Data Source
AI summary
A wellbore isolation system is disclosed. The wellbore isolation system includes a junction positioned at an intersection of a first wellbore and a second wellbore, and a deflector disposed in the junction such that a path into the first leg of the junction is obstructed and engaged with the first leg of the junction to form a fluid and pressure tight seal. The junction includes a first leg extending downhole into the first wellbore, and a second leg extending downhole into the second wellbore. The deflector includes a channel extending axially through the deflector, and a degradable plug disposed in the channel and engaged with the channel to prevent fluid flow through the channel.