Preparation method and device for seabed natural gas hydrate

A hydrate and natural gas technology, applied in the direction of gas fuel, petroleum industry, solid fuel, etc., can solve the problems of low diffusion coefficient of dense hydrate layer, long hydrate formation time, uneven distribution of hydrate, etc.

Active Publication Date: 2009-12-09
INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

The third method, because the diffusion coefficient of the dense hydrate layer formed by the gas at the gas-water interface is very low, it will lead to a rather long time for hydrate formation, which will make the hydrate distribution in the sample pores uneven
[0005] Therefore, there is still no mature and accurate preparation method and device for simulating the formation process of seabed gas hydrate has been disclosed and used.

Method used

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  • Preparation method and device for seabed natural gas hydrate
  • Preparation method and device for seabed natural gas hydrate

Examples

Experimental program
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Effect test

Embodiment 1

[0048] A preparation method (abbreviated test method) for simulating the diffusion and migration of seabed natural gas to form hydrates, the steps are as follows:

[0049] 1) Installation of the sample: dry the soil sample, and put a certain amount of soil sample into the high-pressure reaction vessel A.

[0050] 2) Check the airtightness of the system: close the second and third valves V-2 and V-3, open all other valves, vent nitrogen to 6-8mpa, close the first valve V-1, wait for 3-4 hours, If the gas pressure in the system remains constant, the airtightness of the system is intact.

[0051] 3) Vacuuming: close the first and second valves V-1 and V-2, and open all other first, second, third, fourth, fifth, sixth and seventh valves V-1 and V- 2. For V-3, V-4, V-5, V-6, and V-7, turn on the vacuum pump E to pump air for 15 minutes to 30 minutes. Close the third valve V-3.

[0052] 4) Water injection saturation: open the second valve V-2 and use the water supply tank F to in...

Embodiment 2

[0063] A device (referred to as the test device) that can effectively simulate the preparation method of the seabed natural gas diffusion and migration to form hydrates, according to figure 2 It can be seen that the device includes a high-pressure reaction vessel A, a gas-water mixing and separation high-pressure vessel B, a magnetic stirring device C, a high-pressure advection pump D, a vacuum pump E, a water supply tank F, a gas supply device G, a constant temperature device H, and a data acquisition system L (including various sensors, 2 temperature sensors and 1 pressure sensor), ordinary valve V (composed of seven valves V-1-V-7), the first gas storage cylinder G-1, and high-pressure pipeline M.

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Abstract

The invention discloses a preparation method and a device for seabed natural gas hydrate. The preparation method comprises the following steps: A) installing a sample; B) detecting gas tightness, C) carrying out evacuation to remove impure gas; D) injecting water to saturate the sample; E) adding gas; F) circulating the gas-water mixture to prepare sample; and G) judging whether hydrate is synthesized, namely judging whether the hydrate in the soil sample in a high-pressure reaction container is synthesized under corresponding temperature and pressure on the condition of keeping the pressure of gas in a gas-water mixing and separating container stable. The bottoms of the high-pressure reaction container and the gas-water mixing and separating high-pressure container are connected by a pulsation-free pump and a valve, and upper parts of the high-pressure reaction container and the gas-water mixing and separating high-pressure container are connected by the valve; A vacuum pump and a water supply box are respectively connected with the gas-water mixing and separating high-pressure container by the valve after passing through a three-way connector, and a constant temperature bath in a constant temperature device is connected with a jacket of the high-pressure reaction container by two flexible pipes. The device of the invention has simple structure, high accuracy, high stability and easy operation.

Description

technical field [0001] The present invention relates to the technical field of laboratory simulation of seabed natural gas hydrate, more specifically relates to a preparation method of seabed natural gas hydrate, and also relates to a device for seabed natural gas hydrate, and the device can simulate two modes above the seabed After the formation of hydrate samples, the gas hydrate decomposition phase equilibrium condition test was carried out. Background technique [0002] Gas hydrate is methane CH 4 Such natural gas molecules are sucked into the gaps of the cage-shaped water molecule structure under certain pressure and temperature conditions, thereby forming a solid-like substance. As a strategic alternative energy source, natural gas hydrate has great commercial development value and is expected to occupy a major position in the energy consumption structure of this century. With the increasing shortage of oil and natural gas resources, the development of natural gas hy...

Claims

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Application Information

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IPC IPC(8): C10L3/10C10L5/00
Inventor 魏厚振韦昌富颜荣涛陈辉吴二林
Owner INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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