A pressure-resistant double-layer conveying pipeline

Abstract

The purpose of the present invention is to provide a pressure-resistant double-layer conveying pipeline, which is directly filled with seawater during the installation and sinking into the seabed, which reduces the total weight during transportation and hoisting, and reduces the direct cost during the production process. Process and cost increase due to filling with liquid; including an inner tube, an outer tube, and a flexure stop device, the inner tube is spliced ​​from a plurality of inner tube segments, the outer tube is spliced ​​from a plurality of outer tube segments, and the flexure stop device It includes an outer pipe connection ring, an inner pipe connection ring and a support body. The outer pipe is also provided with an automatic water injection valve. In the annular space between, in order to reduce the influence of seawater static pressure on the pipeline pressure.

Description

technical field [0001] The invention belongs to the technical field of petrochemical transportation equipment and deep water equipment, and particularly relates to a pressure-resistant double-layer transportation pipeline. Background technique [0002] Pipeline and line transportation are the lifeblood of the energy industry. The initial infrastructure construction and the later operation and maintenance process require a lot of investment, and the failure of the pipeline will also cause huge economic losses. With the development of offshore oil and gas, the demand for pipeline transportation between the ocean and the land is getting higher and higher, so the submarine oil pipeline was born. The deep-sea oil pipeline is generally composed of an inner pipe and an outer pipe, and the inner pipe plays the role of transporting oil and gas. , The outer tube is used to protect the inner tube and prevent the pipeline from being damaged under the action of internal oil pressure and ...

AI Technical Summary

Problems solved by technology

[0003] There are still many problems in the laying and operation of the current deep sea submarine oil pipeline. On the one hand, fluid is generally injected into the annular space between the inner pipe and the outer pipe to generate a certain static pressure, which consumes a large amount of fluid and makes the overall weight of the pipeline On the other hand, there is the problem of pipeline buckling. When the external water pressure of the pipeline is too large or when a collision occurs, the pipeline will sag and buckle, and the buckling propagation speed is very fast. When buckling occurs at a certain point of the pipeline, the buckling change will follow Its length direction propagates at a speed of hundreds of meters per second, causing the entire pipeline structure to fail and damage, causing huge economic losses, and the leakage of oil in the pipeline will also cause pollution and damage to the ecological environment

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