A method of dismantling a marine riser
A riser, marine technology, used in earth-moving drilling, wellbore/well components, etc., can solve the problem of low efficiency, limited working space of old risers, and heavy workload of cutting old risers underwater and platform coordination, etc. problems, to reduce workload and improve work efficiency
Active Publication Date: 2022-07-01
OFFSHORE OIL ENG CO LTD +1
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is how to provide a method for dismantling a marine riser, so as to solve the problem that the working space is limited when the old riser is dismantled, resulting in a large workload of underwater old riser cutting and platform coordination, and low efficiency. The problem
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[0017] The present invention is further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.
[0018] The embodiment of the present invention provides a method for dismantling a marine riser, which combines the figure 1 to the attached image 3 shown, including the following six steps.
[0019] S1. Arrange gravity anchors 4 on the seabed.
[0020] Specifically, the positions of the old riser 8 and the jacket 5 are first determined, and this process can be obtained through original design drawings or manual (equipment) survey.
[0021] Then, the gravity anchor 4 is arranged on the seabed outside the jacket 5 according to the position of the jacket 5 , and the guide structures of the gravity anchor 4 are aligned 3 times according to the position of the old riser 8 . Qualify the old ...
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The invention discloses a method for dismantling a marine riser, comprising the steps of: S1, arranging a gravity anchor on the seabed; S2, installing a hoisting rigging on an old riser, and passing a floating wire rope on a floating crane through the The guiding structure of the gravity anchor is connected with the old riser; S3, the fixing structure on the old riser is cut; S4, the old riser is lowered after the cutting is completed, and at the same time, the floating crane passes through the The floating wire rope pulls the old riser from the inside of the jacket; S5, after the old riser is pulled out from the jacket, the guiding structure of the gravity anchor is released; S6, the floating crane The machine directly lifts the old standpipe out of the water surface through the floating hoisting wire rope, thereby completing the removal of the old standpipe. Compared with the traditional dismantling method, the marine riser dismantling method of the present invention can reduce the workload of cutting the old underwater riser and the coordination of the platform, and improve the operation efficiency.
Description
technical field [0001] The invention relates to the technical field of marine riser dismantling, in particular to a marine riser dismantling method. Background technique [0002] Sea transportation installation requires the removal and replacement of the original old risers of the platform. The old risers are located inside the legs of the jacket. Due to the external existence of the legs and the criss-cross tie-bar structure, the removal of the old risers is difficult. [0003] According to the conventional construction method, the upper module structure of the platform is used as the guiding structure to arrange the hoisting rigging, and then the riser is cut into small sections underwater and then lifted out. Riser cutting and platform coordination require a lot of work and low efficiency. Especially for unmanned platforms, there are many platform preparations and a long construction period. SUMMARY OF THE INVENTION [0004] The technical problem to be solved by the pr...
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IPC IPC(8): E21B23/00
CPCE21B23/00
Inventor 赵刚代万宝成二辉薛方孙道青杜颖刘建峰姜宇飞弓志辉张健田瑞南
Owner OFFSHORE OIL ENG CO LTD