Submarine natural gas hydrate extraction device and method

Abstract

The invention provides a submarine natural gas hydrate extraction device and method. The submarine natural gas hydrate extraction device comprises a sleeve. The bottom of the sleeve is in an opened state, and the top of the sleeve is provided with a gas extraction pipeline. A decomposing groove is formed in a sleeve body of the sleeve and provided with a feeding opening, and the top of the decomposing groove is in an opened state. Natural gas hydrate in the decomposing groove is decomposed to release gas containing natural gas and liquid containing decomposed water, the gas is constantly accumulated at the top of the sleeve to form air pressure, the liquid also constantly gushes through the decomposing groove, the air at the top of the sleeve is constantly gathered, and the air pressure isconstantly increased, so that the liquid gushing from the decomposing groove can be extruded from the bottom of the sleeve in an opened state to leave the extraction device and be drained into seawater. The submarine natural gas hydrate extraction device can realize gas-liquid-solid fast separation and gas extraction integrated production of natural gas hydrate mixed fluid, is simple in structureand convenient to use, and greatly reduces the extraction cost of the natural gas.

Description

technical field [0001] This manual belongs to the technical field of marine natural gas hydrate exploitation, and relates to a seabed natural gas hydrate exploitation device and exploitation method. Background technique [0002] Natural gas hydrate is a special form of natural gas, commonly known as "combustible ice", which is an ice-like, non-stoichiometric clathrate crystal compound composed of water and natural gas under certain conditions. It is widely distributed, Due to its large scale and high energy density, it has attracted worldwide attention and is known as "future energy". Most of the natural gas hydrates are methane hydrates. Hydrate is one of the most promising and efficient clean energy sources, and every cubic meter of natural gas hydrate can release 164 cubic meters of methane. At present, CH in gas hydrates with a water depth of less than 3000 meters has been found. 4 The total amount of carbon is equivalent to twice the total amount of known coal, oil, ...

AI Technical Summary

Problems solved by technology

Similar to water-producing gas fields, the produced water in the exploitation of subsea natural gas hydrate will enter the bottom of the well, and part of the produced water may be brought out depending on the energy of the gas flow, but most of the produced water can easily be found in the wellbore and near the well bottom. Accumulation is very harmful; for example, on the one hand, it may seriously affect the back pressure, wellhead pressure, and production capacity; on the other hand, it may affect the permeability of the production layer, thereby affecting the ultimate recovery

A small amount of liquid accumulation in the bottom of the well will cause production reduction or even stop production, seriously affecting the efficient development of gas hydrates

[0004] It can be seen that the technical problems in the current mining and the cost of mining have become the bottleneck restricting the mining of natural gas hydrate in various countries.

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