Deepwater subsea pipeline stopping laying method

Abstract

Disclosed is a deepwater subsea pipeline stopping laying method. The method includes that (1) suspension column line length from a mud touching point to an operating line pipeline is calculated, and pipeline torsion release is finished; (2) the pipeline is recycled to an operating line; (3) tension of a pipe abandon recycling cable is converted to a tensioner, and then an adjusting pipe is mounted; (4) a stopping end socket is mounted on the pipeline; (5) tension conversion is performed, and the stopping laying end socket passes by the tensioner by means of the pipe abandon recycling cable; (6) the stopping end socket is continued to be put down and monitored; (7) the stopping end socket is put down till the end socket touches mud; (8) ultimate accurate positioning of the stopping end socket is performed; a main workboat moves backwards, and a tail of a stinger is located right above the stopping end socket; (9) a pipe abandon recycling hook is separated from a rigging of the stopping end socket, the main workboat recycles the pipe abandon recycling cable, and stopping laying is finished. By means of the deepwater subsea pipeline stopping laying method, deepwater laying of the subsea pipeline can be performed, the stopping end socket of the subsea pipeline can be accurately positioned, and the stopping end socket of the deepwater pipeline can be real-timely monitored and controlled.

Description

technical field [0001] The invention relates to a laying method of a submarine pipeline, in particular to a method suitable for termination laying of a deepwater submarine pipeline. It belongs to the field of offshore oil engineering. Background technique [0002] As the laying of submarine pipelines gradually moves towards deep water, the number of projects for laying deep-water submarine pipelines has increased year by year, and many oilfield production blocks have reached the kilometer level. [0003] At present, the existing submarine pipelines are generally limited to the termination of laying of shallow water pipelines, and the water depth does not exceed 300 meters. The main operating ships use anchored pipe-laying ships to terminate the laying of pipelines, and it is impossible to terminate the laying of deep-water pipelines. The main reasons are as follows: [0004] 1. Since the main work ships are all anchored pipe-laying ships, which are only suitable for waters...

AI Technical Summary

Problems solved by technology

It uses the deep-water dynamic positioning pipe-laying ship to carry out operations, not only can lay the submarine pipeline in deep water; moreover, with the assistance of the underwater robot, the main operation ship can also accurately position the termination head of the submarine pipeline; at the same time, it can also Real-time monitoring and control of the termination head of the deep-water pipeline to ensure the safe and efficient laying of the termination of the deep-water pipeline; solve the problems of positioning accuracy, positioning efficiency, monitoring, pipeline torsion, and complex and difficult-to-control installation of the termination of the deep-water pipeline

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