Pipeline recycling and discarding technology in deepwater S-shaped submarine pipeline laying process

Abstract

The invention discloses a pipeline recycling and discarding technology in a deepwater S-shaped submarine pipeline laying process, wherein the pipeline discarding technology comprises the following steps: firstly, pipeline discarding preparation and the connection of pipeline discarding special equipment; secondly, pipeline discarding overwater operation: (1) converting tensile force of the submarine pipeline from a tensioner to a recycling and discarding winch; (2) moving a ship forward, and separating the submarine pipeline from a pipeline laying ship to a pipeline supporting frame; (3) ceasing to move the ship, and lowering the pipeline to the seabed; and (4) retrograding the ship, and recycling a winch line to the tail end of the pipeline supporting frame; thirdly, discarding the pipeline for underwater operation: (1) withdrawing the ship, and loosening the connection of the winch line and the seal head of the pipeline end; (2) floating the seal end of a pipe section; and (3) recycling the winch line until the tail end of the pipeline supporting frame exceeds the winch line and the seal head of the pipeline end; and fourthly, data acquisition and operation position determination. The process of the pipeline recycling technology is similar to and opposite to that of the pipeline discarding technology. According to the invention, the pipeline recycling and discarding operation can be carried out in the deepwater S-shaped submarine pipeline laying process, the pipeline recycling and discarding operation efficiency in deepwater is improved, and the safety and reliability of the pipeline recycling and discarding operation efficiency in deepwater are enhanced.

Description

technical field [0001] The invention relates to the laying of submarine pipelines, in particular to a process for collecting and discarding pipes suitable for the laying process of deep-water S-shaped submarine pipelines, and belongs to the field of offshore oil engineering. Background technique [0002] As an important part of the development and construction of deep sea oil and gas fields, submarine pipeline laying plays a very important role in the development, production and product export of offshore oil and gas fields. In actual engineering, the commonly used subsea pipeline laying methods mainly include S-type pipe-laying method, J-type pipe-laying method, coil pipe-laying method and pipe-dragging method. [0003] The S-lay method is the most commonly used laying method for submarine pipelines. In the S-type pipe laying method, the pipe is in the same horizontal plane from welding and inspection on the deck operation line of the pipe laying ship. The pipe moves throu...

AI Technical Summary

Problems solved by technology

Moreover, for the abandonment and recovery of pipelines on the seabed, due to the increase in water depth, ships cannot anchor and move anchors, and the positioning work cannot be carried out by floating on the water surface, and underwater operations, due to the deep water depth , divers are no longer able to carry out diving work, therefore, the existing method of collecting and discarding pipes is no longer suitable for deep water operations

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