Pipeline water injection valves and seabed conveying pipeline applying same

Abstract

The invention aims to provide pipeline water injection valves and a seabed conveying pipeline applying the same. Seawater is directly adopted for injection in the process that the seabed conveying pipeline is installed and sinks into the seabed, the total weight in the transportation, loading and hoisting processes is reduced, and meanwhile, the procedure and cost increase caused by direct liquidinjection in the production process is reduced. The seabed conveying pipeline comprises an outer pipe and an inner pipe, wherein buckle arresting structures are arranged in the length direction of theinner pipe and the outer pipe at intervals, a plurality of mounting holes are formed in the outer pipe, a pipeline water injection valve is fixedly mounted in each mounting hole, and the pipeline water injection valves are used for injecting liquid into an annular space between the inner pipe and the outer pipe; and when the external environment pressure is greater than the design pressure, the pipeline water injection valves are controlled to stop injecting water and seal a water inlet of the outer pipe.

Description

technical field [0001] The invention belongs to the technical field of petrochemical transportation equipment and deep water equipment, and in particular relates to a pipeline water injection valve and a submarine transportation pipeline using the same. Background technique [0002] Before the laying of the deep-sea oil pipeline is completed, there is no oil and gas pressure in the pipeline. Therefore, the general deep-sea pipeline is composed of an inner pipe and an outer pipe. The inner pipe plays the role of transporting oil and gas, and the outer pipe is used to protect the inner pipe. Before the completion, the hydrostatic pressure of the external seawater was too high, which caused the buckling and failure of the pipeline, resulting in significant economic losses. [0003] Conventional deep-sea pipelines are filled with liquid in advance before the inner and outer pipes, and then the pipeline is transported to the sea as a whole for laying and installation. However, in...

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Problems solved by technology

[0003] Conventional deep-sea pipelines are filled with liquid in advance before the inner and outer pipes, and then the pipeline is transported to the sea as a whole for laying and installation. However, in this way, fluid is generally injected into the annular space between the inner and outer pipes to generate Static pressure, which needs to consume a large amount of fluid to cause waste of water resources, and secondly, the overall weight of the pipeline will increase a lot after the liquid is poured. cost

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