Exploitation method and equipment for natural gas hydrate on shallow layer of seabed

Abstract

The invention discloses an exploitation method and equipment for natural gas hydrate on the shallow layer of the seabed. Operation is conducted on a water surface exploitation ship, a seabed exploitation device is controlled to conduct physical crushing on shallow strata containing the natural gas hydrate, crushed mixtures are conveyed to a seabed hydrate decomposition device, a seabed heating method is mainly adopted, the solid state existence condition of the natural gas hydrate is changed, the natural gas hydrate contained in the mixtures is decomposed out in a controllable mode, and gasified natural gas is conveyed to deck equipment along a continuous oil tube for being processed and stored. The whole exploitation equipment has a self-walking function, exploited energy can be utilized to generate power, power required by self walking is provided, local sealed heating is adopted for decomposition of the hydrate, and therefore the exploitation method has no influence on biology of the seabed.

Description

technical field [0001] The invention belongs to the field of marine oil and gas equipment, and in particular relates to a method and equipment for exploiting natural gas hydrate in the shallow layer of the seabed. Background technique [0002] Natural gas hydrate is an ice-like crystalline substance formed by natural gas and water under high pressure and low temperature conditions. Natural gas hydrates have high methane content and low combustion pollution. [0003] The main source of natural gas hydrate is the organic matter precipitation on the seabed, in which the abundant carbon can be biotransformed to produce sufficient gas source. At 0°C, it can be formed at 30 atmospheres, and the higher the pressure, the less likely the hydrate will decompose. The seabed is a natural place with temperature, pressure and gas source at the same time. It is widely distributed in the medium gap and has abundant reserves, which are twice the existing natural gas and oil reserves. It ha...

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Problems solved by technology

However, during the exploitation of natural gas hydrates, it is necessary to prevent the uncontrollable overflow of methane gas in the

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