Marine installation method of deepwater jacket by using air sac

Abstract

The invention provides a marine installation method of a deepwater jacket by using an air sac, wherein a jacket on which a plurality of air sac groups are vertically mounted on the upper part of the jacket is provided; an air charging / bleeding connecting pipe is further mounted on the jacket; one end of the air charging / bleeding connecting pipe is integrally connected with one air sac group through an air charging / bleeding hose; the other end of the air charging / bleeding connecting pipe is connected with a hydraulic control system which is mounted on the top of the jacket; in such a connection way, a buoyancy structure for increasing the net buoyancy of the jacket is formed. The marine installation method is characterized in that the diameter of a rod piece located in a wave sensitive region of the deepwater jacket is designed to the minimum value allowed in the fabrication of the jacket rod piece so that the environmental force born by the jacket is effectively reduced and the requirements for the rigidity of the jacket are fundamentally reduced, the jacket is capable of self-floating vertically after being put into water, the installation steps of the jacket are simplified, the construction period of the marine installation of the jacket is shortened, and the marine installation cost is reduced.

Description

technical field [0001] The invention relates to a jacket, in particular to a method for offshore installation of a deepwater jacket by utilizing the net buoyancy generated by an air bag. It belongs to the field of marine engineering technology. Background technique [0002] As my country's offshore oil development continues to move towards the deep water field, large deep water jackets have been used more and more widely. [0003] At present, the water depth of domestic jackets has reached 200 meters. According to the design requirements of the deepwater jacket, the jacket must be designed to be self-floating during the installation process. Usually, this self-floating state needs to be completed by the buoyancy generated by the rods of the jacket itself. That is to say, the buoyancy of the jacket must be greater than its weight, and this greater part is called reserve buoyancy. It is defined as follows: [0004] (Total Buoyancy – Total Weight) / Total Buoyancy = Reserve B...

AI Technical Summary

Problems solved by technology

[0007] 1) The increase in diameter reduces the ability of the rod to resist water pressure, and the rod needs to increase the wall thickness or add a compression ring to meet the design requirements, resulting in an increase in the weight of the rod;

[0008] 2) When the jacket is in place, it is easily affected by wave force and flow force, which are closely related to the diameter of the rod

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