Method and apparatus for simulating gas hydrate accumulation process under one-dimensional condition

A technology of gas hydrates and hydrates, which can be used in measuring devices, solid fuels, and the petroleum industry, and can solve the problems of lack of experimental simulation methods and insufficient research

Inactive Publication Date: 2009-03-04
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Application Information

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Problems solved by technology

However, there are few reports on the simulation of gas hydrates, which are mainly diffusion-type. For real subsurface formations with water depths of hundreds to thousands of meters (experimental pressures can reach tens of MPa), methane The formation process of the main gas hydrate not only needs to simulate the two forms of gas migration and water migration o

Method used

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  • Method and apparatus for simulating gas hydrate accumulation process under one-dimensional condition
  • Method and apparatus for simulating gas hydrate accumulation process under one-dimensional condition
  • Method and apparatus for simulating gas hydrate accumulation process under one-dimensional condition

Examples

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Embodiment 1

[0075] Example 1: One-dimensional hydrate accumulation simulation of methane diffusion into porous media layer

[0076] In this example, a one-dimensional high-pressure reactor consisting of four sections of high-pressure dead-leg 1A and three-stage high-pressure sapphire tube 1B is designed according to the simulation experiment process of hydrate pool formation process, as shown in figure 2 As shown, the simulated experimental device in this embodiment mainly includes a one-dimensional high-pressure reactor 1 (with an inner diameter of 25.4mm, a total length of 1.2m, and an aspect ratio of about 42 in the porous medium filled area), a buffer tank 3, a circulating compressor 4, Gas tank 5, and test system, constant temperature control system, the main body of constant temperature control system is low temperature constant temperature room 8, the main part of device one-dimensional reactor 1, each connecting pipeline, flow meter, differential pressure transmitter, pressure sen...

Embodiment 2

[0078] Example 2: One-dimensional hydrate accumulation simulation in which an aqueous solution saturated with methane and other gases migrates into a porous medium and releases gas

[0079] use figure 2 The device shown in mainly includes a one-dimensional high-pressure reactor 1 (the structural size of the reactor 1 is the same as in Example 1), a metering pump 6, a high-pressure water tank 7, a test system, and a constant temperature control system. Maintain the temperature in the high-pressure reactor 1 and the high-pressure water tank 7 at the set value of 2°C, pass the high-pressure gas into the high-pressure water tank 7, open the stirring device in the high-pressure water tank 7, and make the high-pressure gas dissolve in water, and reach saturation. The porous medium is filled into the one-dimensional reactor 1, and the porous medium is made of 80-100 mesh quartz sand, which is then compacted. After vacuuming, open the valve at the lower part of the reactor 1, start...

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Abstract

The invention provides a method and a device for simulating the accumulation process of a gas hydrate under a one-dimension condition which mainly simulates the accumulation process of the gas hydrate by forming a hydrate in the inner chamber of an one-dimension high pressure reactor; the inner chamber of the reactor is divided into an upper part, a middle part and a lower part; the middle part is divided into an aquiferous porous medium filling area used for generating the hydrate; the upper part and the lower part are free spaces; the method includes: experiment gases are led into the innerchamber of the reactor from the lower part of the reactor to lead the experiment gases to seep from up to down and pass through the porous medium filling area; the hydrate is generated in the porous medium filling area and the experiment gases not reacted are led out from the upper part of the reactor; the forming speed of the hydrate is detected by detecting the flux change of the gases in the seeping process in the porous medium. The method and device can simulate the two forms of gas migration and water migration formed by the hydrate and can simulate the whole processes of the hydrate from nucleation inducing, gradual forming of the hydrate, the accumulation of the hydrate to trapping.

Description

technical field [0001] The invention relates to a method and a device for simulating the accumulation process of gas hydrates, especially natural gas hydrates, under one-dimensional conditions, and belongs to the field of resources. Background technique [0002] Gas hydrate is an ice-like white solid substance formed by natural gas and water under low temperature and high pressure conditions. It is widely distributed in the sediments of the ocean shelf and slopes and in the land permafrost. Because most of the natural gas components are methane, it is also called methane hydrate. According to the preliminary prediction of scientists, the organic carbon in natural gas contained in natural gas hydrates in the world is twice the total organic carbon contained in fossil fuels such as oil, natural gas and coal, and the total resources are about (1.8-2.1)×10 16 m 3 . my country's sea areas and exclusive economic zones have broad prospects for natural gas hydrate resources. Prel...

Claims

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Application Information

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IPC IPC(8): C10L5/00G01N33/00
Inventor 孙长宇陈光进陈立涛郭绪强杨新
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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