Compact FPSO Hull Design for Harsh Environment Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional FPSOs are uneconomical for small and marginal oil fields due to high capital costs and instability in harsh environments, as their size and turret mooring systems do not scale conveniently, leading to increased motion response and operational challenges.
Innovation Solution
A compact FPSO design featuring an oil-over-water storage system with a single column hull, where the largest diameter is at the water surface, reducing with distance from the waterline, and internal water caissons manage pressure, allowing for reduced hull volume and material usage while maintaining stability and high heave natural periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If the size of conventional FPSO is reduced to lower capital costs, then capital cost is reduced, but motion response to wave action increases and stability deteriorates
Solution Approach 1:
The hull is divided into multiple columns (typically 3-7) arranged in a polygonal or circular pattern, each column providing independent buoyancy. This segmentation allows the structure to maintain stability with smaller individual column sizes while the overall arrangement provides the necessary displacement and motion characteristics for harsh environment operation.
Solution Approach 2:
The hull columns feature curved, cylindrical, or polygonal cross-sections rather than flat-bottomed designs. This curvature optimizes hydrodynamic performance, reduces wave impact, and improves motion characteristics while maintaining structural integrity and stability in reduced-size configurations.
2Weight of stationary object
If conventional FPSO size is reduced for marginal fields, then capital cost decreases, but motion response increases affecting operability
Solution Approach 1:
Multiple columns work together to provide combined buoyancy and stability, allowing the facility to maintain adequate motion characteristics and operability even when scaled down for smaller oil fields with lower production rates.
Solution Approach 2:
The structure combines buoyant hull columns with integrated process facilities and accommodation modules, creating a composite system that maintains operational capability while reducing overall size and cost for marginal field applications.
3Stability of the object's composition
If turret mooring system is used in harsh environments, then stability is improved, but capital cost increases significantly
Solution Approach 1:
The multi-column hull design inherently provides stability through its geometric arrangement and buoyancy distribution, reducing or eliminating the need for expensive turret mooring systems while maintaining operational stability in harsh environments.
Solution Approach 2:
The hull form itself provides the stability function through its multi-column configuration and buoyancy characteristics, making the structure self-stabilizing without requiring additional active stabilization systems like turrets.
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
The compact FPSO design reduces capital costs, enhances stability, and maintains operational viability in harsh environments by minimizing rolling, pitching, and heave motions, making it suitable for small and short-life oil fields.
Implementation Method 1
an oil-over-water storage system with a single column hull
Implementation Method 2
a buoyant hull comprising a single column of circular or polygonal cross-section
Data Source
AI summary
An oil storage apparatus (111) comprising a buoyant hull (102) comprising a single column of circular or polygonal cross-section. The interior of said hull (102) comprises at least one oil-over-water tank (103), and said oil storage apparatus (111) further comprises means for maintaining said tank in pressed full condition.