Downhole Latch Assembly for Well Completion Stability
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Solution Overview
Problem
Conventional well completion operations experience movement or 'play' between the mandrel and receptacle, which can damage sand control installations during pumping operations, necessitating a latch assembly that limits or prevents movement between these components.
Innovation Solution
A latch assembly comprising a mandrel, a body lock ring, a collet support, and a collet, which form concentric linear ratchets to secure the mandrel to the receptacle, preventing upward and downward movement through engagement of teeth and shear mechanisms, ensuring secure latching and minimizing play.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional latch is used to couple the mandrel to the receptacle, then the assembly is simple to install, but movement or play between the mandrel and receptacle occurs during pumping operations, which can damage sand control installations
Solution Approach 1:
The latch assembly is divided into multiple independent components including a mandrel, a body lock ring, a collet support, and a collet. Each component performs a specific latching function through concentric linear ratchets, allowing the system to eliminate play between the mandrel and receptacle while maintaining manageable complexity through modular design
Solution Approach 2:
The latch assembly uses a nested structure where the collet is positioned within the collet support, which is in turn positioned within the body lock ring, and all are concentrically arranged around the mandrel. This nested configuration allows multiple latching mechanisms to occupy the same space efficiently, providing robust connection stability without excessive external complexity
2Reliability
If a latch assembly with multiple concentric linear ratchets is used to prevent movement, then movement between mandrel and receptacle is eliminated, but the device complexity increases
Solution Approach 1:
Multiple latching functions are merged into a single integrated assembly where the mandrel, body lock ring, collet support, and collet work together as a unified system. The concentric linear ratchets of each component combine to provide multi-directional constraint, eliminating the need for separate latching devices and reducing overall system complexity while maintaining high reliability
Solution Approach 2:
Each component in the latch assembly serves multiple functions: the body lock ring provides both axial and radial constraint, the collet support engages with both the mandrel and the collet, and the collet provides final securing while also guiding alignment. This multi-functionality reduces the total number of components needed while achieving comprehensive movement prevention
Data Source
AI summary
An assembly and method of latching an upper completion mandrel to a lower completion receptacle that is located downhole to prevent or limit movement between the mandrel and the receptacle. The method includes lowering the mandrel having a latch assembly carried by the mandrel to a first position relative to the receptacle, raising the mandrel to position the latch assembly in a second position relative to the receptacle, and lowering the mandrel to position the latch assembly in a third position relative to the receptacle to limit upward and downward movement of the mandrel relative to the receptacle.