Mining system and method based on marine superficial layer blocky hydrate solid excavation

Abstract

The invention discloses a mining system and method based on marine superficial layer blocky hydrate solid excavation. The mining system comprises a surface layer sediment stripping unit, a blocky hydrate excavating unit, a power lifting unit, a water surface supporting unit and the like; during specific implementation, firstly, seabed surface layer sediments are stripped through a seabed mining / excavating multipurpose vehicle, and combustible ice ore bodies are exposed; then blocky hydrates are excavated through a mining vehicle and are deslimed and broken, and meanwhile a strong sucking technology is adopted to convey hydrate slurry into a seabed relay warehouse through a flexible pipe; and after the hydrate slurry is stirred and subjected to still standing in the relay warehouse, silt and pure hydrates in the hydrate slurry are layered, purified hydrate slurry passes through the interior of a conveying pipeline to be lifted to a hydrate decomposing warehouse of an offshore mining ship deck through a high pressure pump to be decomposed, through a three-phase separation device, the gas phase, the liquid phase and the solid phase are separated, liquid and solids are treated and thenmeat environmental protection requirements to be discharged, and gas is dried and liquefied and then collected and stored. In short, the technical problem of mining of the blocky hydrates is solved by technological means, and large-scale continuous mining of the marine superficial layer blocky hydrates can achieved.

Description

technical field

[0001] The invention relates to the technical field of natural gas hydrate exploitation in sea areas, in particular to a mining system and mining method based on massive hydrate solid mining in the shallow surface layer of the ocean. Background technique

[0002] There are two main types of marine gas hydrates in terms of their occurrence forms. One is pore-filling hydrates, that is, hydrates are filled in the pores of sediments and distributed evenly, and are generally buried deep (>100 meters). Diffusive hydrate; the other is fissure hydrate, that is, the hydrate fills in the fissures of the sediment to form nodules, lenticular or layered massive hydrates, which are also called seepage hydrates .

[0003] Seepage-type hydrates are mainly migrated upward to the shallow surface layer by hydrocarbon-rich fluids along faults or weak structures, and form massive hydrates visible to the naked eye under suitable conditions of temperature, pressure and accumula...

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