Well pattern arrangement method for underground decomposing and extracting natural gas hydrate

Abstract

This invention provides a pattern arrangement method for underground decomposing and exploiting natural gas hydrate. It contains main pipe, injection pipe and gas producing pipe net, wherein the main pipe adopting axial sleeve structure and thermal insulation treated in inner and outer pipe, injecting fluid material and up conveying natural gas from outer pipe. In natural gas hydrate layer, the gas producing pipe and injection pipe adopting plurality of pipes in radiation distribution and having a number of in pairing distributed holes. Said invention raises injected heat and diffused area of chemical agent, enlarges gas producing area and efficiency.

Description

【Technical field】 [0001] The invention relates to the natural gas hydrate exploitation technology, in particular to the well pattern layout method used for underground decomposing and exploitation of natural gas hydrate. 【technical background】 [0002] Natural gas hydrate is mainly stored in the ocean, and it is a white solid crystalline substance formed by the interaction between natural gas and water under low temperature and high pressure conditions. Due to the characteristics of natural gas hydrate, its mining method is different from the development of conventional energy sources (such as coal, oil, natural gas, etc.). For example, coal is solid underground, because its storage depth is small, so it can be directly mined in solid state, that is, it is still solid after mining; oil has a large storage depth, but because oil is a fluid underground, it can be extracted in a liquid state. It is mined in the form of mining, and it is still fluid after mining. Different fro...

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Problems solved by technology

[0004] For underground decomposition mining, regardless of the heat injection method or the chemical agent injection method, it is necessary to inject the decomposition medium, such as hot water, steam, or chemical agents, while the previous method is to achieve injection and gas recovery in the same casing. Moreover, the injection pipe and the gas production pipe are on the same plane, so the collection area is very narrow, the diffusion area of ​​the injected heat or chemical agent is relatively small, and the economical efficiency of mining is very poor.

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