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a use of co 2 and h 2 Method for recovering natural gas hydrate from mixed gas

A mixed gas and mixed gas technology, which is applied in the direction of mining fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of low CH4 content, low industrial application value, and increased overall cost, so as to improve mining efficiency , Overcoming the low mole fraction of methane and reducing the cost of mining

Inactive Publication Date: 2016-08-24
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although CO 2 / N 2 The recovery efficiency of mixed gas is higher than that of gaseous CO 2 Replacement, liquid CO 2 Replacement, CO 2 Emulsion replacement has been greatly improved, but due to the injection of N in the gas 2 The content is high, resulting in CH in the produced gas 4 content is not high, and N 2 / CH 4 Difficult to separate, increasing the overall cost, leading to the acquisition of CH 4 Industrial application value is not high
[0005] The technical problems in the current exploitation and the cost of exploitation have become the bottleneck restricting the exploitation of natural gas hydrate in various countries

Method used

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  • a use of co <sub>2</sub> and h <sub>2</sub> Method for recovering natural gas hydrate from mixed gas
  • a use of co <sub>2</sub> and h <sub>2</sub> Method for recovering natural gas hydrate from mixed gas
  • a use of co <sub>2</sub> and h <sub>2</sub> Method for recovering natural gas hydrate from mixed gas

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Experimental program
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Embodiment 1

[0046] This embodiment provides a CO 2 and H 2 The method of gas hydrate recovery with mixed gas, using such as figure 1 Shown device, this device comprises gas-liquid separation device 1, CH 4 Steam reforming device 2, mixed gas separation device 3. The device communicates with the natural gas hydrate reservoir 4 . The gas-liquid separation device 1 is connected with the natural gas hydrate reservoir 4 through conventional methods, and the gas-liquid separation device 1 is connected with the CH 4 Steam reforming unit 2-phase communication, CH 4 The steam reforming device 2 is connected with the mixed gas separation device 3 through conventional methods, and the mixed gas separation device 3 is connected with the natural gas hydrate reservoir 4 through conventional methods.

[0047] The use of CO provided by this example 2 and H 2 The method for recovering natural gas hydrate with mixed gas comprises the following steps:

[0048] Firstly, the conventional decompression...

Embodiment 2

[0055] This example uses CO 2 and H 2 Experiments were carried out on the method of exploiting natural gas hydrate with mixed gas, and the effect of each mixed gas on CH was calculated. 4 The optimal recovery rate of hydrate and the H 2 highest recovery rate. The method mainly consists of three parts: hydrate sample preparation, depressurization gas injection, and displacement mining, and specifically includes the following steps:

[0056] Hydrate sample preparation: prepare CH at 271.2K to 273.2K, 8.0-10.0MPa 4 Hydrate samples;

[0057] Pressure-reducing gas injection: reduce the pressure to 3.0MPa (above the stable pressure of hydrate) through slow exhaust, keep the pressure constant, and inject the mixed gas (CO 2 and H 2 ) continuous injection of CH 4 In hydrate samples, to CH 4 Free CH in hydrate samples 4 The content is less than 2%;

[0058] Replacement mining: continue to inject the mixed gas to 5.0MPa, and start to enter the replacement stage; the mixed gas ...

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Abstract

The invention provides a method for exploiting natural gas hydrate by utilizing the mixed gas of CO2 and H2. The method comprises: extracting the free gas in the natural gas hydrate deposit by means of decompression mining until the equilibrium pressure corresponding to the temperature of the hydrate deposit or 5%-10% above, and injecting the mixed gas of CO2 and H2 into the natural gas hydrate deposit layer A, to decompose the natural gas hydrate and replace it to obtain CH4 and water; to extract the mixed gas B formed by the CH4 released by the replacement and the remaining mixed gas A through decompression mining; to reform the mixed gas B by steam, Obtain the mixed gas C of CO2 and H2; separate the mixed gas C to obtain hydrogen, and the mixed gas D of CO2 and H2; inject the mixed gas D into the natural gas hydrate deposition layer to continue to exploit the natural gas hydrate. The method for decompressing and replacing natural gas hydrates of the present invention can not only improve the natural gas production efficiency, but also overcome the disadvantages of low molar fraction and difficult separation of methane in the produced products, thereby reducing the production cost.

Description

technical field [0001] The present invention relates to a method using CO 2 and H 2 The invention discloses a method for exploiting natural gas hydrate with a mixed gas, belonging to the technical field of marine natural gas hydrate exploitation. Background technique [0002] Natural gas hydrate is a special form of natural gas. It has wide distribution, large scale and high energy density. It has attracted worldwide attention and is known as "future energy". The data shows that the amount of natural gas hydrate resources discovered in the ocean and tundra in the past two decades is particularly huge, and the organic carbon reserves are equivalent to twice that of the world's proven fossil fuels. In addition, hydrate has a high energy storage density, and produces very little residue and waste after combustion, making it an excellent green energy source. [0003] Most hydrate production methods are based on destroying the phase equilibrium conditions of hydrate, such as c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/22E21B43/40
CPCE21B41/0099
Inventor 孙长宇陈光进王晓辉孙漪霏李楠刘蓓杨兰英
Owner CHINA UNIV OF PETROLEUM (BEIJING)