Deepwater subsea pipeline starting laying method

Abstract

Disclosed is a deepwater subsea pipeline starting laying method. The method includes the following steps that (1) a main workboat moves to an operating place to be in position and is connected with an anchor casting tug; (2) the tug moves to stern of the main workboat and releases a starting cable, and the tug moves to a target and casts a starting anchor to a target point; (3) the main workboat pulls the starting cable to perform starting anchor tension test; the starting anchor is positioned; (4) the starting cable is fixed to the stern; (5) a starting pipeline is laid to the stern; (6) before a starting end socket comes out of a stinger, the main workboat moves forwards, and pipe laying tension is controlled; (7) during mounting of the starting end socket, conditions of stinger passing, putting down state and twisting of the starting end socket are monitored, the starting end socket is positioned, and mud touching positions and coordinates are determined; (8) normal pipeline laying is performed after starting end socket positioning and inspecting. By means of the deepwater subsea pipeline starting laying method, deepwater laying of the subsea pipeline can be performed, and the main workboat can accurately position the starting end socket of the subsea pipeline by the aid of an underwater robot.

Description

technical field [0001] The invention relates to a laying method of a submarine pipeline, in particular to a method suitable for initial 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 initial laying of shallow water pipelines, and the deepest water depth does not exceed 300 meters. The main operating ships use moored pipe-laying ships for the initial laying of pipelines, and cannot carry out the initial laying of deep-water pipelines. . The main reasons are as follows: [0004] 1. Since the main work ships are all anchored pipe-laying ships, they are only suitable for waters with a w...

AI Technical Summary

Problems solved by technology

[0010] The main purpose of the present invention is to overcome the above-mentioned shortcoming existing in the prior art, and provide a kind of method of initial laying of deepwater submarine pipeline, it utilizes deepwater dynamic positioning pipe-laying ship to carry out operation, not only can carry out the laying of submarine pipeline in deep water; And , with the assistance of underwater robots, the main workboat can also accurately position the initial head of the submarine pipeline; at the same time, it can also monitor and control the initial head of the deep-water pipeline in real time to ensure the safe and efficient initial laying of the deep-water pipeline Carried out; Solved the problems of positioning accuracy, positioning efficiency, monitoring, pipeline torsion, and complicated and difficult-to-control installation of heads in the initial laying of deep-water pipelines

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