Pivotable Tensioner Frame for Offshore Vessel Module Handling
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Solution Overview
Problem
Current subsea wellbore operation vessels require time-consuming installation and de-installation of tensioners for both module handling and flexible pipeline laying, due to the dimensions and weight of these components.
Innovation Solution
The tensioner frames are mounted pivotably about a vertical axis on the drilling mast, allowing for easy switching between pipeline laying and module handling configurations, thereby unobstructing the vertical trolley path for efficient module handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If tensioners are installed onto the drilling mast for pipeline laying operations, then the vessel can perform flexible pipeline laying, but the installation and de-installation process is time-consuming due to the dimensions and weight of the tensioners
Solution Approach 1:
The tensioner frame is designed to be pivotable about a vertical axis, allowing it to dynamically change position between a first configuration for pipeline laying and a second configuration that clears the moonpool. This dynamic repositioning eliminates the need for time-consuming installation and de-installation while maintaining adaptability for different operations.
2Adaptability or versatility
If tensioners are installed on the drilling mast, then pipeline laying capability is achieved, but the module handling area and vertical trolley path become obstructed
Solution Approach 1:
The pivotable tensioner frame can be repositioned between operational configurations. When not performing pipeline laying, it pivots to a second configuration that clears the moonpool and vertical trolley path, allowing unobstructed module handling operations.
Solution Approach 2:
The tensioner frame utilizes rotational movement about a vertical axis to change its spatial configuration. This dimensional change allows the same structure to serve different functions at different times without permanently occupying space needed for other operations.
3Stability of the object's composition
If a stationary drilling mast with fixed tensioners is used, then structural stability is maintained, but the vessel cannot efficiently switch between module handling and pipeline laying operations
Solution Approach 1:
The tensioner frame is made pivotable rather than fixed, allowing the structure to adapt its configuration based on operational needs. This maintains structural stability during each operation while enabling efficient transitions between module handling and pipeline laying tasks.
Solution Approach 2:
The same drilling mast structure supports both module handling operations and pipeline laying operations through the pivotable tensioner frame. This multi-functionality eliminates the need for separate fixed structures for each operation type, improving overall productivity.
Data Source
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AI summary
The present invention relates to a vessel (1) adapted to perform subsea wellbore related operations including module handling and laying flexible pipeline, e.g. wellbore intervention, said vessel comprising a hull (2) with a moonpool (5) and a stationary drilling mast adjacent said moonpool. The front side of the drilling mast (10) is provided with vertical trolley rails (11) along which - during module handling - a module handling trolley (12) is movable. Further one or more tensioners (30, 31) are provided to engage a flexible pipeline, also being supported by the by the drilling mast. The tensioner frame (30f) of a tensioner is mounted pivotably about a vertical pivot axis (PA) to the drilling mast, such that the tensioner frame is pivotable between the pipeline laying configuration wherein the lower tensioner is provided in the module handling area and an open configuration wherein a vertical trolley path is unobstructed to allow module handling.