Lock-down mechanism for tubing hanger installation
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Solution Overview
Problem
Conventional methods for installing a smaller hanger into a larger tubing head require the use of a bowl reducer and a larger blowout preventer, which is inefficient and cumbersome.
Innovation Solution
A lock-down mechanism coupled with a bowl reducer that translates the lockdown function of conventional lock screws to a smaller diameter hanger, allowing the use of a blowout preventer with a smaller through-bore and facilitating the installation of a smaller tubing hanger.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a bowl reducer is used to install a smaller hanger into a larger tubing head, then the hanger installation is enabled, but a larger blowout preventer is required which increases device complexity and reduces installation efficiency
Solution Approach 1:
The lock-down mechanism is nested within the bowl reducer assembly, with movable panels positioned inside the bowl reducer bore. This nested configuration allows the lock-down function to be integrated into the reduced-diameter assembly, enabling the use of a smaller blowout preventer while maintaining both the bowl reducer and lock-down capabilities
Solution Approach 2:
The bowl reducer assembly is designed to perform multiple functions: it provides the diameter reduction function of a bowl reducer while simultaneously incorporating the lock-down mechanism to secure the hanger. This multi-functional design eliminates the need for separate lock screws and allows a smaller blowout preventer to handle both operations
2Reliability
If conventional lock screws are used with a bowl reducer, then the lockdown function is provided, but the through-bore size increases requiring a larger blowout preventer
Solution Approach 1:
The lock-down function is transitioned from a radial locking mechanism (conventional lock screws acting on the outer diameter) to an axial locking mechanism (movable panels moving radially inward against the hanger). This dimensional change allows the locking action to occur within the reduced bore space of the bowl reducer assembly
Solution Approach 2:
The lock-down mechanism uses movable panels that can dynamically adjust their position radially inward and outward. These panels move along with the hanger during installation and can be actuated to engage or disengage from the hanger, providing a flexible lock-down function within the constrained space of the smaller through-bore
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 efficient installation of a smaller tubing hanger using a smaller blowout preventer, reducing complexity and improving installation efficiency by translating the lockdown function to the lock-down mechanism and bowl reducer assembly.
Implementation Method 1
a spring disposed within said inner groove and configured to cause said movable panels to move radially inward
Data Source
AI summary
A pipe diameter reduction lock-down system utilizing movable panels that engage with a tubing hanger upon application of force to an outer radial face of said movable panels. The movable panels are secured to a bowl reducer that is configured to seat the tubing hanger to facilitate engagement of the movable panels to the tubing hanger. Conventional lockscrews are used to apply the necessary force to the movable panels. The movable panels are further coupled to a spring such that they disengage from the tubing hanger when the lockscrews are loosened.