Wellhead Hanger Landing Pin Indicator
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Solution Overview
Problem
It is challenging to determine if a hanger has landed on the intended shoulder within a wellhead assembly during mineral extraction, leading to costly and time-consuming corrections after cementing if the hanger is axially offset.
Innovation Solution
An indicator assembly with a spring-loaded indicator pin is coupled to a test port on the wellhead housing, allowing operators to determine if the hanger has landed on the shoulder by depressing the pin and observing visible bands indicating proper or improper placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If no indicator mechanism is installed, then the device complexity is reduced, but the ability to detect hanger placement status becomes impossible
Solution Approach 1:
The indicator pin acts as an intermediary mechanical element that transfers the hanger's axial position information to the operator. When the hanger lands on the shoulder, the pin is depressed and rotates, changing the visibility of bands on the indicator ring. This intermediary mechanism converts internal positional information into an externally observable state without requiring complex electronic or computational systems.
Solution Approach 2:
The indicator ring features bands with different visual characteristics (different colors, patterns, or reflectivity) that become visible or hidden based on the pin's rotation. This visual change provides immediate, intuitive feedback to the operator about hanger placement status, transforming mechanical position into optical information that is easily detectable.
2Measurement precision
If manual inspection methods are used, then the device complexity is minimized, but the measurement precision of hanger placement is insufficient
Solution Approach 1:
The patent replaces imprecise manual inspection methods with a mechanical indicator system that provides definitive placement verification. The indicator pin mechanically engages with the hanger and shoulder assembly, and its rotation—visible through the indicator ring bands—provides precise, unambiguous confirmation of proper hanger landing, eliminating the uncertainty of manual visual inspection.
3Loss of time
If hanger placement is not verified before cementing, then the process time is reduced, but the loss of time from corrections after cementing increases significantly
Solution Approach 1:
The indicator assembly enables preliminary verification of hanger placement status before the cementing operation proceeds. By providing immediate visual feedback on whether the hanger has properly landed on the shoulder, the system allows operators to correct placement issues before cementing, preventing the need for time-consuming corrective operations after the well is cemented.
4Measurement precision
If a complex indicator system is installed, then the measurement precision of hanger placement is improved, but the ease of operation is reduced
Solution Approach 1:
The indicator ring displays bands with contrasting visual characteristics that provide immediate, intuitive feedback. When the hanger is properly placed, specific bands become visible or hidden, giving the operator clear visual confirmation without requiring interpretation of complex data or additional operational steps. The visual contrast makes the indication easily detectable at a glance.
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 accurate determination of hanger placement before cementing, reducing the need for costly and time-consuming corrections by ensuring the hanger is correctly positioned before cementing the well.
Implementation Method 1
An indicator assembly with a spring-loaded indicator pin is coupled to a test port on the wellhead housing
Data Source
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AI summary
A system includes an annular wellhead housing and an indicator assembly. The annular wellhead housing includes a shoulder and a first passage extending radially through the wellhead housing from an exterior surface of the wellhead housing to an interior surface of the wellhead housing. The indicator assembly is configured to extend through the passage, wherein the indicator assembly, when actuated, is configured to indicate whether a hanger disposed within the wellhead housing has landed on the shoulder.