Marine riser suspension joint for typhoon-avoiding evacuation
A riser, single-root technology, applied in drilling pipes, casings, drilling equipment, etc., can solve the problems of increasing the risk of the upper part of the riser colliding with the moon pool, the high stress on the top of the riser, and the damage of the riser, etc. To achieve the effect of simple structure, reducing top stress and preventing collision
Active Publication Date: 2016-02-03
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology
When a single conventional riser is used for suspension, the top of the riser is prone to greater stress, resulting in damage to the riser and increasing the risk of the upper part of the riser colliding with the moon pool
Method used
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[0012] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0013] like figure 1 , figure 2 As shown, when evacuating from a typhoon, first install the elastic body 5 on the conical pipe through the disc 7 and the bolt 6, and after recovering part of the riser, it is necessary to realize the connection between the single riser and the suspended single through the lower flange 8 After the connection is completed, the riser lowering tool is matched with the equal diameter pipe slot 2, and the riser is lowered until the outer diameter of the elastic body 5 is matched with the through hole 10 of the universal joint, and the equal diameter pipe 3 is clamped on the chuck 9, and the upper flange 1 is located above the chuck 9. After the device is installed, the diameter of the upper flange 1 is larger than that of the chuck 9, which can prevent the riser system from falling to a certain extent; the elastic body 5 re...
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The invention relates to a marine riser suspension joint for typhoon-avoiding evacuation. The marine riser suspension joint comprises a main pipe and two elastic bodies. The end of the main pipe is provided with a connector, the main pipe is composed of an equal-diameter pipe on the upper portion and a conical pipe on the lower portion, a clamping groove is formed in the equal-diameter pipe, the conical pipe is of a variable-wall-thickness structure, and a disc is arranged outside the conical pipe. The two same elastic bodies are installed on the conical pipe. The end of each elastic body is in a conical shape, and clamping grooves are formed in the elastic bodies respectively. By means of changes of the wall thickness and combination of the elastic bodies, the purposes of lowering the top stress of a marine riser and preventing the marine riser from colliding with a moon pool are achieved, the marine riser suspension joint is simple in structure and easy to install, and the safety of the marine riser in the typhoon-avoiding evacuation process is improved.
Description
technical field [0001] The invention belongs to the field of deep-water drilling technology and equipment, and in particular relates to a single suspended evacuation riser for typhoon avoidance. Background technique [0002] When a deepwater drilling platform encounters a strong typhoon during operation, in order to avoid damage to the equipment caused by the influence of the center of the typhoon or the storm area around the center, and to ensure the safety of the operation, it is necessary to disengage the riser from the connection between the bottom assembly and the blowout preventer group And recovered to the deck, and then the platform was evacuated to a safe area. In order to save time and improve efficiency, sometimes the riser is not fully recovered, and the platform directly hangs the riser to avoid typhoon evacuation. During the process of suspending the riser on the platform to avoid the typhoon, the top of the riser is rigidly connected with the chuck, and the m...
Claims
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IPC IPC(8): E21B17/00E21B17/02
Inventor 刘秀全陈国明姬景奇畅元江傅景杰
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)