Jacket dismantling ship and dismantling method

Abstract

The invention discloses a jacket removing ship and a removing method. The jacket removing ship comprises a ship body and a turning plate. The back of the turning plate is hinged to a junction of a ship deck and a ship end face through a rotary shaft. The turning plate can be turned over between the ship deck and the ship end face through the rotary shaft. A turning angle of the turning plate is obtuse. The jacket removing ship further comprises a winch, a fixed pulley and a steel wire rope, wherein the winch is fixedly mounted on the ship deck, the fixed pulley is mounted at the upper end of the turning plate, the steel wire rope is penetratingly disposed on the fixed pulley, one end of the steel wire rope is connected to the winch, and the other end of the steel wire rope is provided with a lifting hook. Due to the fact that the turning plate and the steel wire rope traction system are disposed on the jacket removing ship, the turning plate can be used as a lifting arm for lifting a jacket and as a slideway for lading the jacket, by cooperation of the turning plate and the steel wire rope traction system, lifting, dragging and lading of the jacket can be completed simply and effectively, and construction cost of jacket removing is lowered. In addition, by the jacket removing ship which is well adaptable to different water depths, operations at seas with wind and waves can be facilitated.

Description

technical field [0001] The invention relates to a device for removing an offshore jacket and a method for removing the jacket. Background technique [0002] As a shallow water fixed offshore oil and gas development platform, the jacket platform plays an important role in offshore oil and gas development. It consists of a jacket fixed on the seabed and a platform fixed on the upper end of the jacket and above sea level. According to statistics, there are dozens of jackets currently in service in China, among which a large number of platforms have reached or exceeded their design life, and the number of old platforms in the Bohai Sea is the largest. Generally, the design life of an offshore jacket platform is about 20 years. According to laws and regulations such as the "Marine Environmental Protection Law" and "Interim Measures for the Disposal Management of Offshore Oil Platforms", after the expiration of the service life of the jacket platform, if there is no other use, Mu...

AI Technical Summary

Problems solved by technology

However, its disadvantages are relatively obvious. When the jacket is removed, the semi-submersible barge and its backboard are basically attached to the jacket’s facade in a vertical state, so there are at least the following problems: 1. 1. It is very difficult to complete this kind of precise fitting operation on the sea with wind and waves; 2. Since the length of the backboard should be basically the same as the height of the jacket to work normally, it is difficult for a fixed-length backboard Adapt to the dismantling of jackets in different water depths; 3. The structure of the semi-submersible barge and its ballast control system is relatively complex, and the cost of construction and use is high

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