Downhole Shifting Tool Locking Profile Prevents Port Reopening
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In downhole drilling and completions, shifting tools often unintentionally reopen ports while pulling the service string out, affecting production by allowing formation fluids to escape.
Innovation Solution
A system with a tubular string and a shifting tool featuring a locking profile and a key that selectively engages with engagement profiles to control sleeve movement, ensuring the tool remains locked relative to the string, preventing unintended port opening during retrieval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the service string is pulled out to complete the operation, then the operation is completed, but the shifting tool unintentionally reopens ports causing production loss
Solution Approach 1:
The locking profile is engaged with the tool before pulling the service string out, pre-establishing the locked state to prevent unintended port reopening during retrieval. This preliminary action ensures the tool remains in the correct position throughout the withdrawal process.
Solution Approach 2:
The locking profile acts as an intermediary mechanism between the tool and the tubular string, providing a mechanical interface that prevents relative movement. This intermediary structure ensures the tool stays locked in position while allowing the service string to be withdrawn.
2Ease of operation
If the tool is allowed to move with the service string, then the tool can be retrieved, but relative movement causes unintended port opening
Solution Approach 1:
The connection between the tool and tubular string is segmented into two functional parts: the engagement profile that allows controlled movement during operation, and the locking profile that prevents movement during retrieval. This segmentation enables the tool to serve different functions at different stages of the operation.
Solution Approach 2:
The system transitions from a dynamic state during operation (where the engagement profile allows movement) to a static locked state during retrieval (where the locking profile prevents movement). This dynamic adaptation ensures precise port position control when needed while enabling easy retrieval when the operation is complete.
3Reliability
If a locking mechanism is added to prevent tool movement, then port reopening is prevented, but device complexity increases
Solution Approach 1:
The locking and engagement functions are merged into a single integrated profile system. The locking profile and engagement profile work together as part of the same mechanical interface, eliminating the need for separate locking mechanisms and reducing overall device complexity while maintaining reliability.
Data Source
AI summary
A system for performing a downhole operation including a tubular string having a locking profile non-movably located therewith. At least one member is movably mounted with the string and includes an engagement profile. A tool is runnable with the string and has at least one sub with a key. The key is selectively engagable and disengagable with the engagement profile for enabling the tool to control movement of the member with respect to the string when engaged therewith. The key is engagable with the locking profile for restricting relative movement between the string and the tool when engaged therewith. A method of performing a downhole operation is also included.