Detachable device for assisting dismounting of large offshore jacket

Abstract

The invention discloses a detachable device for assisting the dismounting and mounting of a large offshore jacket. The device comprises a buoyancy tank assembly and at least one buoyancy tank mounting auxiliary assembly, and the buoyancy tank mounting auxiliary assembly is mounted on the inner side of the buoyancy tank assembly through a detachable hinge assembly; the buoyancy tank mounting auxiliary assembly comprises a mechanical holding device, a hydraulic power device and a hydraulic control system, and the hydraulic control system can control the hydraulic power device to work so as to drive the mechanical holding device to be opened, held or locked; and the buoyancy tank assembly comprises at least one buoyancy tank, each buoyancy tank comprises at least one lifting control assembly, and each lifting control assembly comprises a water ballast tank and a pressure discharge load system. Under the condition that a floating crane ship is not used, the large jacket can be conveyed to the sea surface from the seabed, the construction cost is reduced, and the engineering period is shortened.

Description

technical field [0001] The invention relates to the field of dismantling of marine engineering equipment, in particular to a detachable device for assisting the dismantling of large offshore jackets. Background technique [0002] At present, more than 7,500 offshore platform structures have been built in the world, and more than 300 offshore platform structures have been built in my country. With the exploitation of offshore oil and gas resources, a large number of offshore platforms have approached or even exceeded their design life. According to international conventions and relevant domestic laws and regulations, offshore oil and gas fields need to be dismantled within one year after the shutdown of offshore oil and gas fields. The dismantling of abandoned offshore platforms will become a problem that the offshore oil and gas exploitation industry must face, and will also become a major emerging industry in the field of marine engineering; The dismantling of the platform ...

AI Technical Summary

Problems solved by technology

This demolition method does not have high requirements on the lifting capacity of the floating crane equipment, but the disadvantages are: a large number of offshore cutting operations are required, the engineering volume is large, the demolition cost is high, and it will cause damage to the ecological environment of the nearby sea area

This demolition method requires less offshore cutting work, but the disadvantage is that it has higher requirements on the lifting capacity of the floating crane, the performance of the floating barge, and the operating time window.

Due to the fact that the offshore platform structure in the later stage of service generally undergoes multiple transformations and the long-term corrosion of the marine environment, it is impossible to accurately estimate the strength, center of gravity, weight and other key parameters of the offshore platform structure to be dismantled before the demolition operation, resulting in the failure of the offshore platform structure. There is a greater risk of total demolition

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