Water jet flow spraying head for seabed natural gas hydrate solid fluidization exploitation

Abstract

The invention relates to a water jet flow spraying head for seabed natural gas hydrate solid fluidization exploitation. A spraying head body is included and internally provided with a water flow blindhole in the axial direction. The peripheral face of the spraying head body is provided with a plurality of spraying hole sets communicating with the water flow blind hole. Each spraying hole in the spraying hole sets is provided with a spraying nozzle. The spraying hole sets include a reverse discharging spraying hole set, a radial spraying hole set, an expanding spraying hole set and an axial spraying hole set which are sequentially arranged on the peripheral face of the spraying head body from back to front. By means of the water jet flow spraying head, large-diameter and regular-circle holes can be formed in the hydrate solid fluidization exploitation process, and the function of promoting crushing particles for reverse discharging is achieved as well.

Description

technical field [0001] The invention relates to the technical field of subsea natural gas hydrate exploitation, in particular to a water jet injection head for solid fluidized exploitation of subsea natural gas hydrate. Background technique [0002] Gas hydrate, also known as combustible ice, has huge reserves, more than twice the sum of known carbon fossil fuels. It mainly exists in land permafrost and ocean bottom, and the reserves of ocean bottom gas hydrate far exceed that in land permafrost. It is a new type of unconventional energy with great mining potential today. my country's marine natural gas hydrate resources have a very broad prospect. According to estimates by researchers from the Ministry of Land and Resources, the total resources of natural gas hydrates in the South China Sea alone have reached 65 billion tons of oil equivalent, which is about half of my country's total onshore and offshore oil and natural gas resources. . [0003] The water depth of marine ...

AI Technical Summary

Problems solved by technology

First of all, in order to ensure a certain amount of mining, the water jet injection head should form a crushing space of a certain scale in the ore seam to ensure that the crushing area is large enough; secondly, the mining surface formed by crushing should be a regular circular shaft to facilitate mining. The return of the material while maintaining the stability of the well wall, the rotary jet head is easy to achieve the above purpose, but the rotary jet head will also greatly limit the jet flow

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