Plugging device and plugging method for annular space of submarine double-layer oil conveying pipe

Abstract

The invention discloses a plugging device and plugging method for an annular space of a submarine double-layer oil conveying pipe. The oil conveying pipe comprise an outer pipe (14) and an inner pipe (13); one end of the inner pipe (13) stretches out of the outer pipe (14); the plugging device comprises an inner sleeve type pipe clamp (1) and an outer sleeve type pipe clamp (7); one end of the inner sleeve type pipe clamp (1) is matched with the outer wall of the outer pipe (14) in a sealing manner while the other end thereof is matched with the outer wall of the inner pipe (13) in the sealing manner; the inner sleeve type pipe clamp (1) is internally filled with a sealing agent (5); the outer sleeve type pipe clamp (7) is sleeved outside the inner sleeve type pipe clamp (1); one end of the outer sleeve type pipe clamp (7) is matched with the outer wall of the outer pipe (14) in the sealing manner while the other end thereof is matched with the outer wall of the inner pipe (13) in the sealing manner; and the outer sleeve type pipe clamp (7) is internally filled with concrete (12). As the clamp-in-clamp form is adopted, and the sealing agent and the concrete material are used in the invention, the problem of sealing failure caused by thermal elongation which is resulted from the change of the oil temperature is solved.

Description

technical field [0001] The utility model relates to a seabed pipeline repair device, in particular to a seabed double-layer oil pipeline annular space sealing device, and the invention also relates to a sealing method. Background technique [0002] At present, submarine pipelines have single and double-layer pipes. Single-layer pipes are mainly used for single medium transportation of water and gas at sea; double-layer pipes are used for condensable crude oil or mixed transportation (oil, gas, water) combined medium transportation. . Due to the variety of chemical elements in the crude oil and the mixed transport medium, the inner wall of the pipeline will be corroded. After a long period of corrosion, the pipeline will leak. In severe cases, production will be stopped, resulting in economic losses in the oil field. In order to minimize such losses, it is necessary to promptly and quickly repair damaged pipelines. At present, the main difficulty in the repair of double-lay...

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to avoid the deficiencies in the prior art and provide a sealing device and sealing method for the annular space of the double-layer oil pipeline on the seabed. The problem of thermal expansion and elongation leading to seal failure

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