Millable Joint Cutting Guide for Lateral Wellbore Reentry
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Solution Overview
Problem
Reentry operations for constructing lateral wellbores from existing main wellbores are time-consuming and risk damage to the original wellbore system, potentially rendering it non-functional.
Innovation Solution
A system comprising a multi-lateral anchor assembly, whipstock insert attachment, and cutting/milling assemblies that allow for precise deflection and extension of lateral wellbores from the main wellbore, reducing the risk of damage and increasing efficiency by utilizing existing infrastructure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional reentry operations are used to construct lateral wellbores, then lateral wellbore construction is achieved, but the operations are time-consuming and risk damage to the original wellbore system
Solution Approach 1:
The millable joint is pre-installed at the junction point before lateral wellbore construction begins. This preliminary placement of the cutting guide and millable joint structure allows the cutting tool to be guided precisely through the joint without requiring time-consuming conventional reentry operations, thereby reducing operational time while maintaining construction capability
Solution Approach 2:
The millable joint acts as an intermediary structure between the main wellbore and the lateral wellbore. It provides a pre-configured passage with integrated cutting guides that mediate the transition from main to lateral wellbore, eliminating the need for damaging conventional reentry methods while improving construction efficiency
2Productivity
If traditional reentry operations are used to construct lateral wellbores, then lateral wellbore construction is achieved, but damage to the original wellbore system occurs
Solution Approach 1:
The millable joint serves as a protective intermediary structure that channels the cutting tool through a predetermined safe path. This intermediary structure prevents direct contact between the cutting tool and the main wellbore wall, eliminating damage risk while maintaining lateral wellbore construction capability
Solution Approach 2:
The millable joint is designed with self-guiding features including cutting guides and alignment mechanisms that automatically direct the cutting tool through the correct path. This self-service capability ensures the cutting operation proceeds without external intervention, preventing damage to the main wellbore while maintaining construction efficiency
3Manufacturing precision
If a cutting guide is disposed within a millable joint at a multilateral junction, then precise cutting path guidance is achieved, but the complexity of the downhole system increases
Solution Approach 1:
The cutting guide, alignment features, and millable joint structure are merged into a single integrated component. This combination eliminates the need for separate installation of multiple components, reducing operational complexity while maintaining precise cutting path guidance through the integrated design
Data Source
AI summary
Disclosed herein are various embodiments of a downhole system having a millable joint with a first portion shaped to extend into a main wellbore and a second portion shaped to extend into a lateral wellbore, a cutting guide at least partially disposable within the millable joint; and a cutting assembly configured to move alongside the guide until engaging with a sidewall of the millable joint. Further disclosed are various embodiments for methods of operating a downhole system having a millable joint. Further disclosed are various embodiments for a downhole deflector assembly, having a deflector securable within a main wellbore wherein an uphole end of the deflector comprises an angled face configured to direct one or more tubulars from the main bore to a lateral bore and a whipstock insert attachment detachably securable to the deflector.