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Apparatus and method for direct access of subsea pipelines

A technology of submarine pipelines and pipelines, which is applied in pipeline laying and maintenance, pipes/pipe joints/fittings, earthwork drilling and mining, etc.

Active Publication Date: 2021-05-18
EQUINOR ENERGY AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some additional ship time is required to get this done before the actual access / connection operation

Method used

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  • Apparatus and method for direct access of subsea pipelines
  • Apparatus and method for direct access of subsea pipelines
  • Apparatus and method for direct access of subsea pipelines

Examples

Experimental program
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Embodiment Construction

[0037] As described above in relation to background art, it is known to start a pipeline by landing the end of the pipeline near a subsea structure and "shocking" the end to a hub or connection point for sealing with a selected clip-on connector Direct access to subsea structures.

[0038] In the present invention, the end of the pipeline is landed on a pipeline landing frame on top of the subsea structure. The main idea of ​​the invention is to be able to temporarily install pipeline ends directly on top of the subsea formwork (or other subsea structure) to which subsequent direct access is to be performed. This means that the pipeline is installed directly in the correct bay and location; moreover, the pipeline ends are temporarily installed on top of the structure so that pipeline pigs or PLETs do not crash into the subsea structure.

[0039] The invention enables the pipeline to be placed straight in place for direct access and makes temporary installation adjacent to the...

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PUM

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Abstract

A method of installing a subsea pipeline (1) with direct access to a subsea structure (5), comprising: landing an end (101) of the pipeline on a pipeline landing frame (6) on the surface of the subsea structure (5), the pipeline The landing frame (6) provides a location for landing the end (101) of the pipeline (1) before connecting to the connection point to the subsea structure (5), followed by lowering the pipeline end (101); and connecting the pipeline ends Connection point to subsea structure (5). A pipeline landing frame (6) for implementing the method is also described.

Description

technical field [0001] The present invention relates to the deployment and direct connection of subsea pipelines for transporting hydrocarbons. Background technique [0002] Pipelines for transporting hydrocarbons, such as oil or natural gas, are usually laid along the seabed using laying vessels. Such subsea pipelines may be installed, for example, between two subsea structures, where the subsea structures may be "Christmas trees", riser bases, blowout preventers (BOPs) or some other structure. One or both ends of the pipeline are often connected (or "tied-in") to the subsea structure using separate jumpers or spools. The extra parts and procedures associated with using separate jumpers or spools lead to high costs for the installation process. The direct access method can also be used and is often preferred. These methods include: [0003] · Direct pull in, where the end of the pipeline is pulled close to the subsea structure using the winch position of the laying ves...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16L1/16E21B43/013F16L1/12F16L1/26
CPCE21B43/013F16L1/20F16L1/26F16L1/16F16L1/19
Inventor G·恩达尔P·R·奈斯特龙
Owner EQUINOR ENERGY AS