A method for moving a cantilever beam out and back to a platform as a whole

Abstract

The invention provides a method for integrally shifting a cantilever beam out of a platform and moving the cantilever beam back to the platform. The method comprises a shift-out process of integrally moving the cantilever beam from a platform of a cantilever beam type drilling platform to a floating dock and a move-back process of moving the cantilever beam back to the platform from the floating dock after respectively reconstructing the cantilever beam and the platform, wherein in the shift-out process, a rigid tooling rail which is aligned to the side wall of a cantilever beam support is designed, a trolley provided with a lifting device is arranged on the tooling rail, a hydraulic system is utilized to assist a jacking top plate to jack up the cantilever beam, the lifting device is controlled to tightly jack up the top plate, the trolley and the cantilever beam are fixed by use of a horse plate, and after the trolley and the cantilever beam are relatively positioned, a hauling tooling and a winch are utilized to pull the cantilever beam to roll and slide along the tooling rail; In a move-back process, the cantilever beam is conveyed in a reverse direction and is aligned to the rail, and the cantilever beam is loaded back by use of a pushing device of the rail. The method provided by the invention has the advantages of reasonable, safe and efficient process, high tooling machinability, good construction operability and low cost.

Description

technical field [0001] The invention relates to a method for refitting an offshore platform, in particular to a method for moving out and back a cantilever beam of an offshore platform as a whole. Background technique [0002] The jack-up drilling platform is one of the four major offshore mobile drilling devices and an indispensable means for offshore oil and gas exploration and development. The jack-up drilling platform is composed of a platform, legs and a lifting mechanism. The platform can be raised and lowered along the legs, and generally has no self-propelled capability. In the initial stage of development of the jack-up drilling platform, the drilling operation is basically carried out within the scope covered by the platform deck, and the drill floor can only make a certain displacement within the deck. Drilling operations. [0003] The design and construction of the cantilever beam drilling platform has greatly improved the operation function of the jack-up dril...

AI Technical Summary

Problems solved by technology

The main technical issues involved are: 1. The cantilever beam requires high installation accuracy; 2. The cantilever beam is very sensitive to deformation; 3. The cantilever beam is huge in weight; 4. The modified cantilever beam has been used for a long time, resulting in permanent The deformation of the scheme increases the difficulty

At present, most of the projects for shifting the cantilever beams occur in the new stage of the platform, and the shifting of the cantilever beams (not operated by the platform itself) is a rare project during the modification process

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