A method and device for exploiting deep-sea natural gas hydrate

Abstract

The invention provides: a method and a mining device for mining deep-sea natural gas hydrate. At present, the development of seabed natural gas hydrate is still in its infancy. Traditional methods such as mechanical salvage, mechanical extraction, hot water injection, and drilling platform collection are often used. The cost is relatively high, and it is easy to cause excessive decomposition of unstable natural gas hydrate and damage the seabed topography. On the basis of the hot water infusion method, the invention directly arranges movable trumpet-shaped gas-collecting hoods and gas-collecting pipe network on the bottom of the water to prevent leakage, and gasifies natural gas hydrate on the seabed by means of temperature rise and decompression. Collect air bubbles directly to the sea surface platform or island reef storage. The heat source for heating can come from waste heat from factories on the coast or on islands, and at the same time comprehensively utilize solid mineral tailings backfill to protect the seabed topography. It has the advantages of saving energy, protecting seabed topography, and comprehensively utilizing waste heat and waste residue.

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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