Multi-column Tension Leg Platform Heave Reduction
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Solution Overview
Problem
Conventional semi-submersible offshore platforms in shallow water and marginal fields face challenges such as high motion characteristics, costly and complex fabrication, inability to handle subsidence, and vulnerability to earthquakes, which affect production efficiency and relocation options.
Innovation Solution
A buoyant semi-submersible offshore platform with vertically configured flotation columns and pontoons that provide balanced stability, allowing for efficient anchoring and production methods, including top-tensioned and catenary risers, to minimize heave motion and facilitate easier relocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional horizontal pontoons are used to support vertical columns, then the platform can maintain its position, but the fabrication becomes costly and complicated
Solution Approach 1:
The patent inverts the conventional arrangement by placing vertical columns directly in the water to provide buoyancy, rather than using horizontal pontoons to support vertical columns. This inversion simplifies fabrication while maintaining platform stability through the vertical columns' direct water interaction and buoyant force.
2Adaptability or versatility
If conventional semi-submersible platforms with large motion characteristics are used, then the platform can operate in various conditions, but top-tensioned risers cannot be supported due to excessive heave
Solution Approach 1:
The patent changes the motion parameters by using vertically configured columns with specific buoyancy characteristics that reduce heave motion amplitude and frequency. This parameter change enables the platform to support top-tensioned risers while maintaining operational versatility in various sea conditions.
3Stability of the object's composition
If fixed platforms are used in shallow water, then the platform structure is stable, but the platform cannot handle subsidence effectively
Solution Approach 1:
The patent transitions from a static fixed platform to a dynamic floating platform that can adapt to subsidence. The vertically configured columns with buoyancy elements provide dynamic adjustment capability, allowing the platform to compensate for reservoir subsidence while maintaining structural stability.
4Reliability
If conventional catenary risers are used to absorb large motions, then the risers can handle platform motion, but the platform cannot support top-tensioned risers due to excessive motion
Solution Approach 1:
The patent changes the platform motion parameters through vertical column configuration, reducing heave amplitude to levels that enable top-tensioned riser operation. This parameter change expands riser type flexibility while maintaining reliable motion absorption capabilities.
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 platform achieves reduced motion characteristics, cost-effective manufacturing, and enhanced operational efficiency, enabling effective use in subsiding environments and seismic areas while supporting top-tensioned and wet tree solutions.
Implementation Method 1
a hull which is a large structure that is designed to float on a body of water
Data Source
AI summary
A multi-column tension leg platform is an offshore floating structure that is used to facilitate production of natural resources contained below the seabed. The multi-column tension leg platform includes a hull which is used to keep the entire structure afloat. The structure also includes a topside which is mounted to the top of the hull. The topside is used as a surface for supporting workers and equipment. The hull is made up of a plurality of flotation columns and a plurality of pontoons. Both the plurality of flotation columns and the plurality of pontoons are positioned about a vertical central axis of the topside. The plurality of flotation columns and the plurality of pontoons are buoyant structures that are aligned vertically and are used to keep the topside above water. The plurality of pontoons is mounted amongst the plurality of flotation columns.