Ocean platform block offshore double-boat integral migration method

Abstract

An ocean platform block offshore double-boat integral migration method includes the steps: firstly, preparing migration; secondly, separating a guide pipe frame from a block; thirdly, approaching two common tugboats to two sides of the guide pipe frame in place; fourthly, abutting the tugboats; fifthly, transferring the weight of the block onto the two common tugboats from the guide pipe frame; sixthly, moving the tugboats backwards; seventhly, aligning the positions of the two common tugboats and a towage barge; eighthly; transferring the weight of the block onto the towage barge from the two common tugboats; ninthly, enabling the two common tugboats to deviate from a towage barge; tenthly, aligning the positions after the block is hauled to a sea area to be provided with the block; eleventhly, abutting the block; twelfthly, transferring the weight of the block onto the two common tugboats from the towage barge; thirteenth, abutting a block leg and a newly built guide pipe frame and transferring the weight; fourteenth, moving the tugboats backwards to finish disassembly and assembly of the integral block. A disassembled platform can be transferred only by the aid of the two common tugboats, and offshore construction amount is greatly reduced.

Description

technical field [0001] The invention relates to a method for offshore migration of an offshore platform block, in particular to a method for integral migration of an offshore platform block with two ships at sea. It belongs to the field of marine engineering technology. Background technique [0002] The development of offshore oil and gas fields generally needs to go through the whole process of exploration, development project construction, production and disposal, among which disposal is the final link. [0003] At present, the disposal of oil and gas fields is mainly the dismantling of decommissioned offshore platforms. The main method of dismantling them is: after cutting the platform blocks and jackets, hoisting the platform blocks as a whole or in pieces by offshore floating cranes to transport on board and migrate it. [0004] In the process of dismantling or relocating platform blocks, the weight and center of gravity of the dismantled platform are the most importa...

AI Technical Summary

Problems solved by technology

Due to the transformation and renovation of the platform during service, the weight and center of gravity of the block will change greatly, making it difficult to estimate the weight and center of gravity of the block

Therefore, the conventional hoisting scheme is more sensitive to the weight and center of gravity of the block, and it is necessary to select a suitable floating crane according to the weight of the block, and the use of a large floating crane is very expensive

At the same time, due to the limitation of the lifting weight of the floating crane and the influence of the arrangement of the lifting points, it is necessary to cut, dismantle and reinstall the partial structure and facilities of the block, which greatly increases the offshore construction period and construction complexity.

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