Multi-Level Seabed Connection Troughs for Reduced Footprint
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Solution Overview
Problem
The challenge is to install a large number of flexible bottom-surface connections from a single floating support in the oil and gas industry, particularly at medium to great depths, while minimizing space and interference between connections, and simplifying the manufacturing and installation process without prior knowledge of the number or characteristics of connections needed.
Innovation Solution
The solution involves a multiplicity of flexible pipe connections supported by arch-shaped guide elements called troughs, with the low point of the double plunging chain of one portion of the flexible line located below that of an adjacent portion, reducing the number of floats and allowing for a reduced footprint, and enabling sequential manufacture and laying of pipes from a surface vessel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple flexible connections are installed from a single floating support, then the number of connections increases, but interference and stress on the seabed worsen
Solution Approach 1:
The patent introduces vertical stratification by arranging flexible connections at different heights above the seabed. Support structures are positioned at multiple elevation levels, creating a three-dimensional configuration that separates connections vertically. This dimensional approach allows multiple connections to coexist without lateral interference while distributing seabed stress across different spatial zones, thereby increasing the number of connections without proportionally increasing harmful effects.
Solution Approach 2:
The patent divides the support structure into multiple independent segments positioned at different heights. Each support structure serves as an independent unit that can be optimized individually, allowing flexible connections to be distributed across multiple vertical zones. This segmentation enables better spatial management of connections and reduces concentrated stress on the seabed by spreading loads across multiple support points at different elevations.
2Device complexity
If traditional single-level support structures are used, then the structure is simple, but the footprint is large and installation space is consumed
Solution Approach 1:
The patent transitions from a two-dimensional horizontal arrangement to a three-dimensional vertical configuration. By positioning support structures at multiple heights, the system utilizes the vertical dimension to accommodate multiple flexible connections within a smaller horizontal footprint. This vertical stacking approach maintains structural simplicity while dramatically reducing the area required on the floating support deck compared to traditional single-level radial arrangements.
Solution Approach 2:
The patent implements a nested configuration where support structures at different heights are vertically aligned or offset to create a compact hierarchical arrangement. Lower support structures are positioned beneath or adjacent to upper ones, creating a space-efficient nested pattern that maximizes connection density within minimal horizontal space while maintaining structural integrity and accessibility for installation operations.
3Reliability
If the number of floats is increased to support more connections, then support capacity increases, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple support functions into fewer float units by utilizing the vertical arrangement of flexible connections. The stacked configuration allows a single float to support multiple connections at different heights through appropriately positioned support structures, thereby reducing the total number of floats required compared to traditional single-level arrangements where each connection would require separate float support. This merging approach maintains adequate support capacity while reducing overall system complexity.
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
This configuration allows for a high number of flexible connections to be installed with reduced interference and stress on the seabed, facilitating easier installation and maintenance, while optimizing buoyancy and reducing the risk of pipe damage and seabed disruption.
Implementation Method 1
said flexible line adopting, by its own weight, the form of a curve called a double plunging chain
Data Source
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AI summary
The present invention relates to a seafloor-surface linking apparatus between a single floating support (2) and the seafloor, comprising a plurality of flexible lines comprising flexible hoses (1) stretching from said floating support to the seafloor, said flexible lines being supported by a plurality of tubes (3, 3a-3b), each tube defining two portions of hose comprising a first portion of flexible line (1-1) embodied as a double catenary curve descending from the floating support (2) to said tube and a second portion of flexible line (1-2) embodied as a simple catenary curve between said tube and the point of contact (l-2a, l-2b) of the flexible hose on the seafloor. The apparatus comprises at least one support structure (4) comprising a lower element forming a base (4-1) resting and/or anchored or driven into the seafloor and an upper element (4-2, 4-2a - 4-2b) supporting at least two tubes, lower (3b) and upper (3a), arranged at differing heights (Ha, Hb) such that the low point (1-1b) of the first portion (1-1) of flexible line passing through the lower tube (1b) is located below the low point (1-la) of the first portion (1-1) of flexible line passing through the upper tube (3a).