Hanger Assembly Tabs for Wellhead Port Alignment and Anti-Rotation
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Solution Overview
Problem
Conventional hangers do not provide a means for orienting and aligning ports with wellhead ports, leading to misalignment and potential damage from fluid erosion, and they fail to prevent rotation within the wellhead, causing further misalignment.
Innovation Solution
A hanger assembly with alignment/anti-rotation tab members that move between retracted and extended configurations, aligning with recesses in the wellhead to prevent rotation and maintain port alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hangers are used without alignment/anti-rotation members, then the hanger assembly is simpler in structure and easier to manufacture, but the ports become misaligned with wellhead ports causing fluid erosion and functional failure
Solution Approach 1:
The alignment/anti-rotation members are pre-configured on the hanger assembly before installation. These members protrude outward to engage with corresponding recesses in the wellhead, establishing proper alignment and preventing rotation before the hanger is fully installed, thereby ensuring port alignment from the outset
Solution Approach 2:
The alignment/anti-rotation members act as intermediary elements between the hanger assembly and the wellhead. These members provide a mechanical interface that ensures proper orientation and prevents misalignment, serving as a mediator that connects and aligns the two components
2Ease of manufacture
If conventional hangers without anti-rotation capability are used, then the hanger assembly is simpler and more cost-effective, but rotation occurs causing port misalignment and requiring costly removal and replacement
Solution Approach 1:
The anti-rotation members are pre-installed on the hanger assembly during manufacturing. These members engage with the wellhead to prevent rotation before any operational issues arise, eliminating the need for future repairs related to misalignment
Solution Approach 2:
The alignment/anti-rotation members provide protective engagement with the wellhead before any rotational damage can occur. This preliminary protective mechanism prevents misalignment and fluid erosion, cushioning against potential damage before it happens
3Reliability
If alignment/anti-rotation members are added to the hanger assembly, then port alignment and rotation prevention are achieved, but the manufacturing cost and structural complexity increase
Solution Approach 1:
The alignment/anti-rotation function is segmented into separate protruding members on the hanger assembly. These members can be independently manufactured and then attached to the hanger, allowing for specialized production of each component rather than requiring a completely redesigned hanger structure
Solution Approach 2:
The alignment/anti-rotation members serve multiple functions: they provide alignment, prevent rotation, and ensure proper port orientation. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in manufacturing complexity and cost
Data Source
AI summary
A hanger assembly has at least one elongated channel disposed on the outer surface of the hanger assembly. An alignment/anti-rotation tab member is moveably disposed within each elongated channel and can selectively alternate between a first retracted configuration and a second extended configuration. In the second extended configuration, each alignment/anti-rotation tab member can be received within a mating channel along the inner surface of the central through bore of the wellhead. Each extended alignment/anti-rotation tab member can engage against a mating recess or channel in order to align and orient the hanger assembly within the central through bore of the wellhead (permitting orientation and alignment of ports in the hanger assembly and the surrounding wellhead), while also preventing rotation of the hanger assembly relative to the wellhead.