Method and device for exploiting deep-sea natural gas hydrate

Abstract

The invention provides a method and a device for exploiting a deep-sea natural gas hydrate. At present, the development of a submarine natural gas hydrate is still at a starting stage; conventional methods of mechanical fishing, mechanical extraction, hot water perfusion, drilling platform collection and the like are used more frequently; the cost is higher; moreover, the instable natural gas hydrate is easily enabled to excessively decompose; a submarine topography is damaged; according to the method and the device for exploiting the deep-sea natural gas hydrate, on the basis of a hot water perfusion method, a movable bell-mouth-shaped gas collecting hood group and a gas collecting pipe network are arranged at the bottom of a sea; a leakage is prevented; the natural gas hydrate is gasified at a sea bed through the approaches of a temperature rise, a pressure reduction and the like; a gas bubble is collected by a gas collecting hood to be directly led to an offshore platform or an island / reef reservoir. A heat source for the temperature rise can come from the waste heat of a factory on a coast or an island; meanwhile, the submarine topography is protected by comprehensively utilizing the mill tailings of a solid mineral product for backfilling. The method and the device for exploiting the deep-sea natural gas hydrate have the advantages that energy sources are saved; the submarine topography is protected, the waste heat and a waste residue are comprehensively utilized.

Description

technical field [0001] The invention relates to the technical field of a seabed natural gas hydrate exploitation method and exploitation equipment. Specifically, it is a technical field that comprehensively utilizes waste heat and waste residue to decompose natural gas hydrate to realize industrial mining, and protects the seabed topography and mining equipment. Background technique [0002] Submarine gas hydrate, especially the development of seabed gas hydrate is still in its infancy. Natural gas hydrates will decompose under heat and decompression conditions to produce methane and other gases. At present, it is mainly mined by mechanical salvage, mechanical extraction, hot water injection, and drilling platform collection at home and abroad. Among them, the mechanical salvage method not only destroys the seabed topography, has a lot of waste residue, but also easily causes leakage; the mechanical extraction method and hot water injection method change the temperature an...

AI Technical Summary

Problems solved by technology

Among them, the mechanical salvage method not only destroys the seabed topography, has a lot of waste residue, but also easily causes leakage; the mechanical extraction method and hot water injection method change the temperature and pressure of the natural gas hydrate reservoir, which may easily cause excessive decomposition of hydrate and cause seabed subsidence; drilling The initial investment of platform collection is large, and most of the drilling holes are immovable, so the utilization rate of seabed natural gas hydrate is low

[0003] The above method not only leads to rapid loss of precision equipment and high cost, but also tends to cause excessive decomposition of unstable natural gas hydrate

When the seabed gas hydrate decomposes in a large area, it will not only waste the decomposed gas hydrate on the seabed, but also easily cause seabed subsidence and landslides. In the long run, methane will diffuse into the atmosphere and aggravate the greenhouse effect

In summary, the traditional method of exploiting seabed natural gas hydrate is expensive, and it is easy to cause excessive decomposition of unstable natural gas hydrate and damage the seabed terrain. Mining methods, and design of improved mining equipment

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