Marine pipelaying and method for abandonment of a pipeline

A pipeline and pipeline technology, applied in the field of pipeline waste, which can solve problems such as A&R procedures and systems that are not completely satisfactory

Active Publication Date: 2016-06-22
ITREC BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] Existing A&R procedures and systems have been found to be not entirely satisfactory

Method used

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  • Marine pipelaying and method for abandonment of a pipeline
  • Marine pipelaying and method for abandonment of a pipeline
  • Marine pipelaying and method for abandonment of a pipeline

Examples

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Embodiment Construction

[0104] exist figure 1 In , an offshore pipelaying vessel 1 provided with a device according to an embodiment of the invention is shown. The device allows the installation of pipelines 2, for example for hydrocarbons such as natural gas or oil, to the seabed.

[0105] The pipe-laying vessel 1 has a hull, here a monohull hull 3 , provided with a boatwell 4 extending through the hull between a deck 5 adjacent to the boatwell 4 and the bottom of the hull. The pipeline water inlet tower 10 is arranged at the position near the stern of the boat well 4 . In an alternative embodiment, the vessel has a semi-submersible hull comprising one or more pontoons and columns supporting a deck box at a distance above the one or more pontoons. The pipe laying device is mounted on the deck box with eg a boat well passing through the deck box.

[0106] For example, as shown here, the bridge and cabin sides are arranged in front of the well 4 on the hull 3 .

[0107] Preferably, the tower 10 is...

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Abstract

The invention provides a marine pipelaying and a method for abandonment of a pipeline. The invention provides a method for installing a pipeline on the seabed from a marine pipelaying vessel, comprising initiation, pipelaying, and abandonment of the pipeline. An embodiment of the abandonment of the pipeline comprises: halting pipelaying and engaging a hang-off clamp (30) with the pipeline at a position below one or more tensioners, transferring the weight onto the hang-off clamp and holding the seagoing pipeline in the firing line, severing the pipeline, connecting the initiation cable (41) to the lower end of the pipeline held by the one or more tensioners, transferring pipeline tension onto the initiation cable, releasing the one or more tensioners, so that a section of the pipeline is held in the firing line between the pipeline diverter (17) and the initiation cable, vacating the firing line by at least displacing both the pipeline diverter and the initiation cable sheave and thereby displacing said section of the pipeline from the firing line, arranging the A& R cable (51) in the firing line, connecting the A & R cable to the upper end of the seagoing pipeline held in the firing line, releasing the hang-off clamp, operating the A& R winch and thereby lowering the pipeline onto the seabed.

Description

technical field [0001] The invention relates to the field of offshore pipeline laying, in which a pipeline is laid to the seabed from an offshore pipeline laying vessel. In particular, the invention relates to the abandonment of pipelines, often due to inclement weather. Background technique [0002] In general, offshore pipeline laying vessels are equipped with A&R systems, short for "disposal and recovery systems". [0003] An example of an offshore pipelaying vessel equipped with an A&R system is disclosed in WO2007 / 108673. This known vessel includes a pipeline entry pylon. The pipeline diverter is supported at an elevated position on the tower. Below the pipeline diverter is a retractable tensioner supported by the tower. The drape clamp allows holding the sea line when cutting the sea line from the section of the line held by the tensioning device. This known ship also has an A&R system for disposal and recovery of pipelines. The A&R system includes an A&R winch a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L1/20
CPCF16L1/207F16L1/16F16L1/205F16L1/23F16L1/235F16L3/012F16L3/1218F16L3/1222
Inventor J·鲁登伯格T·W·A·威赫梅尔
Owner ITREC BV
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