Well Access Line Drum Arcuate Core Flange Junction Stress
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Solution Overview
Problem
Conventional drum assemblies for well access lines in the hydrocarbon recovery industry face significant stress concentration and plastifying issues due to increased tension from longer, more tortuous wells, leading to reduced life expectancy and frequent replacements, with no effective modifications to address these challenges.
Innovation Solution
A drum design featuring an inner core with an arcuate configuration at the core-flange junction and a structurally independent collar to distribute stress, combined with monolithic construction and reinforcement features such as ductile inserts or split flanges, to reduce plastifying and extend the drum's lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If conventional drum assemblies are used for well access lines, then the drum can accommodate and withdraw the line, but the drum experiences significant stress concentration and plastifying at the core-flange junction leading to reduced life expectancy
Solution Approach 1:
The drum is divided into separate components: an inner core, flanges, and a collar. The flanges are detachably connected to the core, allowing for independent reinforcement of the core-flange junction area. This segmentation enables targeted strengthening at the stress concentration point without redesigning the entire drum structure.
Solution Approach 2:
High manganese steel material is applied specifically at the core-flange junction where stress concentration occurs, while other parts of the drum use standard materials. This local quality enhancement provides targeted strength improvement at the critical stress point without unnecessary cost or weight elsewhere in the structure.
Solution Approach 3:
The drum employs composite construction combining high manganese steel at the core-flange junction with other suitable materials for the remaining structure. This composite approach allows optimization of material properties at different locations based on stress distribution, improving overall durability and stress resistance.
2Reliability
If the drum structure is reinforced to withstand higher stress, then plastifying resistance improves, but the device complexity and manufacturing cost increase
Solution Approach 1:
By segmenting the drum into core, flanges, and collar components with detachable connections, the design allows selective reinforcement only where needed at the core-flange junction, rather than reinforcing the entire drum structure. This maintains reliability improvement while controlling overall complexity.
Solution Approach 2:
The reinforcement using high manganese steel is applied locally only at the core-flange junction where stress concentration occurs, rather than throughout the entire drum. This localized approach provides the necessary plastifying resistance while minimizing added complexity and manufacturing cost.
Data Source
AI summary
A drum assembly for accommodating a well access line. The drum of the assembly may include a core coupled to flanges at either side thereof. The core may be configured to accommodate the well access line thereabout. Additionally, the core may be configured with an inner portion for coupling to the flanges at an arcuate junction therebetween as well as a collar about the inner portion for directly accommodating the well access line in a stable manner.