Offshore Drilling Rig Dual Hoisting System Redundancy
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Solution Overview
Problem
Offshore drilling rigs face challenges in reducing production time and operational costs while maintaining efficiency, especially when essential equipment is out of order due to maintenance or breakdowns.
Innovation Solution
The implementation of two hoisting systems with a positioning system that allows for simultaneous or independent operation over different work centers, enabling dual activity, dual lifting, and redundancy modes to ensure continuous operation even if one system is disabled.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single hoisting system is used, then the device complexity is reduced, but the reliability decreases when equipment is out of order
Solution Approach 1:
The hoisting system is segmented into two independent subsystems (first and second hoisting systems), each capable of operating independently. This segmentation allows one system to continue operations if the other fails, thereby improving reliability without requiring a completely redundant complex system.
Solution Approach 2:
Both hoisting systems are designed with universal functionality to perform the same drilling and lifting operations. The positioning system enables either system to service either work center (first or second), creating a multi-functional capability that enhances reliability while managing complexity through standardized design.
2Productivity
If two hoisting systems are implemented, then the productivity increases through simultaneous operations, but the device complexity increases
Solution Approach 1:
The positioning system is designed to dynamically reposition load carriers between different work centers based on operational needs. This dynamic capability allows the system to adapt its configuration for simultaneous operations at both work centers, maximizing productivity while the modular design keeps complexity manageable.
Solution Approach 2:
The two hoisting systems share common support structures and control systems where possible, merging infrastructure resources. This combining approach reduces overall complexity compared to having completely separate systems while still enabling simultaneous productive operations at multiple work centers.
3Adaptability or versatility
If the positioning system repositions load carriers between work centers, then the adaptability increases, but the time for repositioning affects the duration of action
Solution Approach 1:
The positioning system is designed to anticipate operational needs and pre-position load carriers at optimal locations before they are needed. This preliminary action reduces the actual repositioning time required during critical operations, thereby minimizing the impact on the duration of action while maintaining high adaptability.
Data Source
AI summary
An offshore drilling rig comprising a drill deck, at least one primary well center and a diverter system arranged below the primary well center, a drilling support structure extending upwardly from the drill deck and above the primary well center and the other work center and a first and a second hoisting system supported by the drilling support structure and being adapted for raising or lowering a first and a second load carrier, respectively, and where the offshore drilling rig comprises a positioning system adapted for selectively positioning at least the first load carrier in at least a first or a second horizontal position different from the first horizontal position, where the first load carrier in the first horizontal position is positioned above the primary well center, and in the second horizontal position is positioned above the other work center.