Method for exploiting natural gas hydrates and device thereof

Abstract

The invention discloses a method for developing natural gas hydrate, which comprises that building developing well, horizontal well and collecting well, building floating platform and natural gas hydrate developer on sea, building sea concentration heater, preparing hot salt water, decomposing natural gas hydrate and collecting natural gas. And the inventive device comprises a sea floating platform, a developing well, a collecting well, a horizontal well, a hydrate recycling system, a fresh water groove, a hot salt water tube, a hot salt water pump, and a seawater concentrating heater. The invention has simple process, low energy consumption and low cost, without pollution.

Description

technical field [0001] The invention belongs to the field of energy technology, and relates to a natural gas hydrate exploitation technology, in particular to a method and device for exploiting marine natural gas hydrate. Background technique [0002] Natural Gas Hydrate (Natural Gas Hydrate, referred to as Gas Hydrate) is a non-stoichiometric, ice-like, cage-type crystalline compound formed by low-molecular-weight hydrocarbons in water and natural gas under low temperature and high pressure conditions. Natural gas hydrate has the characteristics of a host-guest material. Water molecules (host) form a spatial lattice structure through hydrogen bonding, and gas molecules (guests) fill the cavities between the water molecule lattices through van der Waals forces with water molecules. . Natural gas hydrates are mainly methane hydrates, most of which occur in the seabed, which have the advantages of large reserves, wide distribution, shallow burial, high energy density, and no ...

AI Technical Summary

Problems solved by technology

U.S. Patent US6994159B2 and Japanese Patent JP09158662 proposed to inject thermal fluids such as hot water and steam into natural gas hydrate reservoirs through production wells to promote the decomposition of natural gas hydrates. Large heat loss and low utilization rate of heat energy

Chinese patent CN1609409A proposes a method and device for exploiting natural gas hydrate by using microwave heating, and U.S. patent US6148911 proposes the exploitation of natural gas hydrate by underground electric heating, but these methods require electric heating, high energy consumption costs, and complicated mining devices

Chinese patent CN1779191A discloses a method of heating seawater by using a seabed heat pump, and then thermally decomposing and exploiting natural gas hydrate. Install compressors, condensers, evaporators and other equipment in an underwater high-pressure environment, and the equipment installation, operation and sealing technology are difficult

But CO 2 The problem with the displacement method is that the CO formed 2 Hydrate solids tend to wrap on the outer surface of methane hydrate, which leads to incomplete decomposition of gas hydrate, extremely slow replacement reaction, and a large amount of CO 2 Gas separation and transportation costs will also increase the cost of extraction

[0010] So far, there is no economical and effective method for large-scale industrial production of gas hydrates

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