Hanger Running Tool Asymmetric Castellated Engagement
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Solution Overview
Problem
Current drilling and production systems face challenges in efficiently and securely connecting and disconnecting hangers from tubular strings within wellhead assemblies, particularly in ensuring directional control during the mating and un-mating processes.
Innovation Solution
A hanger running tool with an outer sleeve and an inner driving sleeve, featuring castellated and threaded surfaces, allows for directional control by enabling rotation of the hanger in one direction while preventing rotation in the opposite direction, ensuring secure engagement and disengagement with tubular strings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a hanger running tool is used to connect and disconnect hangers from tubular strings, then the efficiency of connection and disconnection is improved, but directional control during mating and un-mating processes becomes difficult to ensure
Solution Approach 1:
The patent employs asymmetric castellated surfaces with tapered edges on the hanger and corresponding asymmetric engagement surfaces on the inner driving sleeve. This asymmetric geometry enables the tool to rotate the hanger in one direction (mating) while preventing rotation in the opposite direction (un-mating), thereby providing directional control through the inherent geometric asymmetry of the engagement surfaces.
Solution Approach 2:
The inner driving sleeve acts as an intermediary component between the outer sleeve and the hanger. It selectively engages with the hanger's castellated surface to control rotation direction, while the outer sleeve provides the mating surface for the hanger. This intermediary structure enables differentiated control of mating and un-mating operations through its selective engagement and disengagement mechanisms.
2Reliability
If directional control is enforced during hanger connection and disconnection, then operational reliability is improved, but device complexity increases due to additional control mechanisms
Solution Approach 1:
The asymmetric castellated surfaces with tapered edges provide inherent directional control through their geometric design. The taper allows engagement in one direction while preventing engagement in the opposite direction, eliminating the need for additional complex control mechanisms and maintaining operational reliability through the simplicity of the asymmetric geometry.
Solution Approach 2:
The inner driving sleeve is designed to be axially movable within the outer sleeve, allowing it to dynamically engage with or disengage from the hanger's castellated surface. This dynamic positioning enables the tool to provide directional control when needed (during engagement) while simplifying the overall structure by using a single movable component rather than multiple fixed control mechanisms.
Data Source
AI summary
A hanger running tool for a hanger includes an outer sleeve and an inner driving sleeve. The outer sleeve is configured to engage and couple the hanger running tool to the hanger, and the inner driving sleeve is selectively axially movable within the outer sleeve for engagement with the hanger to prevent relative rotation between the hanger running tool and the hanger.