Method and system for collecting seabed combustible ice

Abstract

The invention provides a method and system for collecting seabed combustible ice. An inverted funnel-shaped methane collector is released to the bottom of water through an offshore methane collecting boat, in other words, the collector is reversely buckled on a methane hydrate accumulation layer on the a seabed, and a hot water injection pipeline is arranged at the bottom in the collector. High-temperature seawater or steam is injected into the bottom of the collector constantly, the combustible ice is heated and decomposed, decomposed methane is continuously conveyed to the methane collecting boat through a collecting pipeline at the top end in the collector and is cooled and pressurized to be made into liquefied natural gas (LNG) or compressed natural gas (CNG) or the combustible ice again to be stored, part of the methane is used for heating seawater, the methane collecting boat is used for dragging the methane collector at the bottom of the water, and continuous large-scale production can be achieved in the whole collecting process. The method and system for collecting the seabed combustible ice have the advantages that methane hydrates can stop being decomposed only if injection of the high-temperature water is stopped, insulation measures are taken on the pipelines and container pots, and emissions only contain carbon dioxide.

Description

technical field [0001] The invention relates to a method and system for collecting combustible ice on the seabed, especially a method and system for collecting marine oil and gas resources with simple structure, reliable operation, low cost, energy saving, environmental protection, safety, controllability and no pollutant discharge. The technical field belongs to marine The field of oil and gas resource exploitation. Background technique [0002] The combustible ice on the seabed is a crystal formed by the combination of methane and water molecules in a low-temperature and high-pressure environment. The main gas component produced after heating and decompression is high-purity methane. The methane molecule has only one carbon atom, and the emission of carbon dioxide after combustion is small. And no sulfide is produced, it is an ideal clean energy. Due to the low-temperature and high-pressure environment, a large amount of very stable combustible ice is deposited on the sea...

AI Technical Summary

Problems solved by technology

At present, there is no mature technology and method for collecting this kind of seabed combustible ice in the world that has been formally put into commercial operation, because the existing collection methods are relatively complicated, costly, and lack controllability and operability. It is easy to cause methane leakage, causing environmental pollution and atmospheric greenhouse effect. All existing technologies are still in the stage of laboratory exploration and cannot be put into commercial operation.

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