Offshore platform crude oil riser maintenance and replacement device and crude oil riser maintenance and replacement method

Abstract

The invention provides a novel device for maintaining and replacing a vertical crude oil pipe of an offshore platform. The device comprises a water partition cabin and a plurality of connecting assemblies for connecting the water partition cabin with pile legs of the offshore platform. A through hole for the vertical crude oil pipe to penetrate through is formed in the bottom of the water partition cabin. The device further comprises a sealing piece. The sealing piece comprises a rubber sealing cylinder and a rubber sealing frustum which are sequentially arranged. The diameter of the upper bottom face of the rubber sealing frustum is smaller than that of the lower bottom face of the rubber sealing frustum. The rubber sealing cylinder is connected with the upper bottom face, with the small diameter, of the rubber sealing frustum. The sealing piece is provided with an inner cavity penetrating through the two axial end faces. The lower bottom face of the rubber sealing frustum is connected with the through hole. The invention further provides a method for maintaining and replacing the vertical crude oil pipe of the offshore platform. By means of the novel device for maintaining and replacing the vertical crude oil pipe of the offshore platform, the interior of the water partition cabin can be separated from seawater, and water can be prevented from entering the water partition cabin; when the lower portion of the water partition cabin is fixedly installed, operation is convenient, and the construction safety of workers can be guaranteed.

Description

technical field [0001] The invention relates to the maintenance field of crude oil risers, in particular to a novel offshore platform crude oil riser maintenance and replacement device and a crude oil riser maintenance and replacement method. Background technique [0002] The existing maintenance and replacement technology for crude oil risers on offshore platforms is divided into above-water maintenance and replacement technology and underwater maintenance and replacement technology according to the different damaged parts. The maintenance and replacement of the risers above the water adopts conventional methods to cut and replace crude oil risers above the water surface, and only the water surface can be repaired. above the riser section. For the maintenance and replacement of the riser in the underwater part, a crude oil riser maintenance device on an offshore platform can be used for maintenance and replacement of the crude oil riser; the maintenance device includes: a w...

AI Technical Summary

Problems solved by technology

But this maintenance device still has the following problems: 1. After pumping water inside the water-proof cabin, the sealing effect is not very good, and seawater may enter; 2. It is inconvenient to put the water-proof cabin into seawater and fix it, and there are potential safety hazards ;3. The bottom seal of the water-proof tank requires divers to work underwater, which is greatly affected by the weather and waves

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