Natural gas hydrate exploitation method

Abstract

The invention relates to the technical field of seabed shallow layer natural gas hydrate exploitation, in particular to a natural gas hydrate exploitation method. A water injection well and an exploitation well are arranged in the sea, a hydrate layer is heated by the water injection well, the water injection well communicates with the exploitation well communicate with each other on the water surface through a first water tube, thus, water drained from the exploitation well enters the water injection well, the exploitation well and the water injection well communicate with each other by the first pipe, thus, hot water separated from the exploitation well is injected into the water injection well again, part of hot water form hot cycle, namely low-temperature water which is injected into the water injection well at the very beginning is heated and injected into the hydrate layer, the hydrate layer is heated, thus, the temperature of a mixture collected by the exploitation well is high,water separated from the mixture is injected into the hydrate layer again, therefore, part of heating energy can be saved, heat loss is reduced, and the cost is saved.

Description

technical field [0001] The invention relates to the technical field of seabed shallow natural gas hydrate exploitation, in particular to a natural gas hydrate exploitation method. Background technique [0002] Natural gas hydrate, commonly known as "combustible ice", is a crystalline substance formed by natural gas and water under high-pressure and low-temperature environments. The content of methane in natural gas hydrate is extremely high, and it has the characteristics of large heat production during combustion, low pollution, and fossil deposits. Twice the energy and other advantages. It has broad development prospects and is one of the important clean energy in the future development. [0003] Gas hydrates in my country mainly exist in permafrost and the seabed, and the reserves of seabed gas hydrates far exceed those in land permafrost areas. Therefore, how to properly develop seabed gas hydrates has important strategic significance. Current research shows that my co...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a natural gas hydrate mining method in view of the problem of high heat energy loss and high cost caused by the current natural gas hydrate thermal shock method

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