Subsea Header Pipe Joint Assembly for Fewer Tie-In Connections
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Solution Overview
Problem
Current methods for connecting subsea pipelines to subsea structures are time-consuming and costly, requiring numerous lifting procedures and underwater connections, especially when using separate jumpers or spools, which increase complexity and costs.
Innovation Solution
A method involving a header pipe joint with a valve installed, connected inline with a spool or pipeline before lowering to the subsea structure, using a connection bridge for direct fluidic connection, reducing the number of components and connections needed, and simplifying the installation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate jumpers or spools are used to connect subsea pipelines to subsea structures, then the connection can accommodate installation tolerances and pipeline expansion, but the number of components and connections increases, leading to higher costs and longer installation time
Solution Approach 1:
The patent merges the spool and manifold into a single integrated subsea assembly, eliminating the need for separate jumper connections. The manifold is positioned within the spool structure, creating a unified component that reduces the total number of parts and connections required during installation.
Solution Approach 2:
The integrated spool-manifold assembly performs multiple functions simultaneously: it accommodates installation tolerances through the spool's flexible connection capabilities, provides manifold distribution functions, and enables direct pipeline tie-in. This multi-functional design eliminates the need for separate dedicated components for each function.
2Manufacturing precision
If multiple lifting procedures are used to install foundation structure, manifold, and spool separately, then each component can be installed precisely, but the installation time and operational costs increase significantly
Solution Approach 1:
The patent combines the manifold and spool into a single integrally constructed assembly that can be installed in one lifting operation rather than multiple separate lifts. This reduces installation time while maintaining precision through the pre-integrated design that ensures proper alignment and connection.
Solution Approach 2:
The manifold and spool are pre-assembled and integrated into a single unit before deployment, with all necessary connections and alignments prepared in advance. This preliminary integration ensures that when the assembly is lifted and installed, precision is maintained without requiring multiple separate lifting operations.
3Adaptability or versatility
If numerous underwater connections are made during pipeline tie-in, then the system can be assembled on-site, but the complexity and cost of the installation process increase
Solution Approach 1:
The patent merges the manifold and spool into a single pre-assembled unit that requires fewer underwater connections during installation. The integrated design allows the entire assembly to be deployed as one package, reducing the number of separate connection operations needed on-site while maintaining the flexibility of on-site deployment.
Data Source
AI summary
A method of installing a header pipe joint at a subsea structure is provided, comprising providing a header pipe joint having at least one valve installed therein and connecting the header pipe joint inline of a spool or pipeline prior to lowering the header pipe joint to the subsea structure. The header pipe joint is then lowered to the subsea structure, and the valve is connected to the subsea structure (e.g. a subsea production system of the subsea structure such as a xmas tree) with a connection bridge e.g. a choke bridge. This provides a fluidic connection between the subsea structure and the header pipe joint. The subsea structure comprises a foundation, e.g. suction anchors, which provide support for both a wellhead and the header pipe joint. A subsea assembly comprising a subsea structure, header pipe joint and connection bridge is also provided.