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Device and method for efficiently extracting natural gas hydrate by using surface layer hot sea water

A technology of hydrate and hot seawater, which is applied in the direction of mining fluid, earthwork drilling, wellbore/well components, etc. It can solve the problem that it is difficult to meet the large amount of heat of hydrate, and achieve good market prospects and efficient mining.

Inactive Publication Date: 2010-08-18
INST OF MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

The decompression method uses the energy of the formation itself to decompose hydrate, so it is difficult to meet the large amount of heat required for hydrate decomposition, and the energy source for hydrate decomposition by chemical injection is a difficult problem

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  • Device and method for efficiently extracting natural gas hydrate by using surface layer hot sea water
  • Device and method for efficiently extracting natural gas hydrate by using surface layer hot sea water
  • Device and method for efficiently extracting natural gas hydrate by using surface layer hot sea water

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Embodiment Construction

[0028] The decomposition process of natural gas hydrate is an endothermic process, and the decomposition heat is about 40-60KJ / mol. For tropical ocean areas, due to the sun's rays, the surface temperature of seawater is relatively high, and there is huge heat energy stored in seawater.

[0029] The device and method of the present invention for efficiently exploiting natural gas hydrate by using hot seawater on the surface are applicable to a wide range of tropical ocean areas. In this embodiment, only the ocean in the South my country Sea area of ​​China is taken as an example. my country's South China Sea is located in the tropics. Due to the sun's rays, the seawater surface temperature is relatively high, and the water temperature near the sea surface is about 25-30°C. Although the heat flux density of seawater is low, its total heat energy is considerable due to the large amount.

[0030] Such as figure 1 As shown, the device of the present invention for efficiently expl...

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Abstract

The invention discloses a method for efficiently extracting a natural gas hydrate by using surface layer hot sea water, which comprises the following steps of: introducing surface layer high-temperature sea water on the sea surface into a benthonic hydrate layer; radiating the heat of the high-temperature sea water into the hydrate layer by using a pipe wall of a water pipe to ensure that the hydrate is heated and decomposed. In the method, pipelines are paved on a seabed, the surface layer hot sea water is infused into the pipelines by using a water pump, and through temperature differences and heat exchanges between the infused sea water and the surrounding environment of the seabed, the hydrate absorbs heat to decompose a gas so as to realize efficient extraction. The method fully uses ready-made convenient resources to economically and efficiently realize the extraction of the benthonic natural gas hydrate, is expected to be used widely, and has a good market prospect.

Description

technical field [0001] The invention relates to the field of natural gas hydrate exploitation, in particular to a device and method for efficiently exploiting natural gas hydrate by using surface hot seawater. Background technique [0002] It has been proven that there are natural gas hydrate resources in the South my country Sea, and it is preliminarily predicted that the prospective resources of natural gas hydrate in the South my country Sea can reach tens of billions of tons of oil equivalent. How to exploit the hydrate resources in the South my country Sea has become a key issue. The methods for mining hydrates include decompression method, heating method and chemical agent injection method. The decomposition process of natural gas hydrate is an endothermic process, and the decomposition heat is about 10 4 J / mol. If a large amount of hydrate deposits is to be exploited, a huge amount of thermal energy is required. The decompression method uses the energy of the form...

Claims

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Application Information

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IPC IPC(8): E21B43/241
CPCE21B41/0099
Inventor 李家春张珍
Owner INST OF MECHANICS - CHINESE ACAD OF SCI
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