Device and method capable of achieving synchronous mesoscopic observation of formation and decomposition of gas hydrates

A gas hydrate and gas technology, applied in the direction of measuring devices, analyzing materials, material analysis through optical means, etc. Visualization and other issues to achieve the effect of shortening the experimental cycle and the reliability of observation results

Active Publication Date: 2019-12-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there have been a large number of experimental studies on the formation and decomposition of gas hydrates, most of which only investigated the changes in temperature and pressure during the formation and decomposition of hydrates, and the reaction devices do not have visualization, which cannot directly reflect the process of hydrate nucleation and growth
In addition, there are optical microscopes used to study the growth and dist

Method used

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  • Device and method capable of achieving synchronous mesoscopic observation of formation and decomposition of gas hydrates
  • Device and method capable of achieving synchronous mesoscopic observation of formation and decomposition of gas hydrates
  • Device and method capable of achieving synchronous mesoscopic observation of formation and decomposition of gas hydrates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A method for synchronous mesoscopic observation of gas hydrate formation and decomposition based on the device, comprising steps:

[0046] (1) Fill the same porous medium into three sapphire cylinders respectively, add 3.5 wt% NaCl solution to simulate seawater to 100% saturation, and seal the reactor;

[0047] (2) Open the valves V2 and V3 in the device, open the valve V1 and then turn on the vacuum pump for 3 minutes;

[0048] (3) Close the stop valve V1, turn off the vacuum pump, then close the valve V3, open the main valve of the gas cylinder and open the pressure reducing valve V2, fill the gas storage tank with methane gas to 14 MPa, and then close the valve V2 and the pressure reducing valve 2 in turn and cylinder main valve;

[0049] (4) Open the valve V3, then open the branch valves V4, V5, and V6 respectively, open the secondary pressure reducing valves 61, 62, and 63 until the pressure is 0.05 MPa, and fill a small amount of methane gas into the high-pressur...

Embodiment 2

[0054] A method for synchronous mesoscopic observation of gas hydrate formation and decomposition in porous media based on the device, comprising steps:

[0055] (1) Fill the three sapphire cylinders with different porous media (or thermal mass enhancement materials), add SDS solution to 100% saturation, and seal the reactor;

[0056] (2) Open the valves V2 and V3 in the device, open the valve V1 and then turn on the vacuum pump for 3 minutes;

[0057] (3) Close the stop valve V1, turn off the vacuum pump, then close the valve V3, open the main valve of the gas cylinder and open the pressure reducing valve V2, fill the gas storage tank with methane gas to 14 MPa, and then close the valve V2 and the pressure reducing valve 2 in turn and cylinder main valve;

[0058] (4) Open the valve V3, then open the branch valves V4, V5, and V6 respectively, open the secondary pressure reducing valves 61, 62, and 63 until the pressure is 0.05 MPa, and fill a small amount of methane gas into...

Embodiment 3

[0063] A method for synchronous mesoscopic observation of gas hydrate formation and decomposition in porous media based on the device, comprising steps:

[0064] (1) Fill the same porous medium into three sapphire cylinders respectively, add 3.5 wt% NaCl solution to simulate seawater to 100% saturation, and seal the reactor;

[0065] (2) Open the valves V2 and V3 in the device, open the valve V1 and then turn on the vacuum pump for 3 minutes;

[0066] (3) Close the stop valve V1, turn off the vacuum pump, then close the valve V3, open the main valve of the gas cylinder and open the pressure reducing valve V2, fill the gas storage tank with methane gas to 14 MPa, and then close the valve V2 and the pressure reducing valve 2 in turn and cylinder main valve;

[0067] (4) Open the valve V3, then open the branch valves V4, V5, and V6 respectively, open the secondary pressure reducing valves 61, 62, and 63 until the pressure is 0.05 MPa, and fill a small amount of methane gas into ...

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Abstract

The invention discloses a device and a method capable of achieving synchronous mesoscopic observation of formation and decomposition of gas hydrates. The device comprises a gas cylinder, a vacuum pump, a gas storage tank, a low-temperature thermostatic bath, a high-pressure visual reaction kettle, a sealing box, a pressure-stabilizing gas inlet system, a data acquisition instrument, a real-time display system and a pressure-stabilizing exhaust system. The high-pressure visual reaction kettle comprises a plurality of transparent sapphire inner cylinders, an upper flange, a lower flange and a quartz outer cylinder; the sapphire inner cylinder is of a hollow structure and is arranged in the transparent quartz outer cylinder, and the upper flange and the lower flange are used for sealing the inner cylinder and the outer cylinder. The upper and lower flanges are provided with a plurality of interfaces. Each sapphire inner cylinder can be used for the formation and decomposition of gas hydrates simultaneously. A drying agent is placed in the sealing box, and fogging can be avoided through observation in the sealing box. According to the invention, the formation and decomposition of gas hydrates can be researched at high pressure and low temperature; multiple groups of experiments are carried out at the same time, online real-time synchronous mesoscopic observation of morphology and dynamic changes of formation and decomposition of the gas hydrate can be achieved, and analysis is carried out through image processing software, so that the influence of hydrate nucleation and growthrandomness is reduced while the operation efficiency is improved.

Description

technical field [0001] The invention relates to an experimental device for the formation and decomposition of gas hydrates, in particular to an experimental device for synchronous mesoscopic observation of the formation and decomposition of gas hydrates, belonging to the technical field of petroleum and natural gas. Background technique [0002] Gas hydrate is a non-stoichiometric cage-like crystal substance formed by water and small molecule gases (methane, ethane, carbon dioxide, nitrogen and hydrogen sulfide, etc.) at a certain temperature and pressure, so it is also called cage hydrate thing. It is a non-stoichiometric inclusion formed by the host molecules, namely water molecules, combining with each other through hydrogen bonds to form a cage-shaped void, and enveloping the guest molecules in it. At present, the research on hydrates focuses on gas storage and transportation, cold storage and energy storage, gas separation, exploration and production, etc. The storage...

Claims

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Application Information

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IPC IPC(8): G01N21/84
CPCG01N21/84G01N2021/8405
Inventor 郎雪梅李欣樊栓狮王燕鸿李刚王盛龙于驰
Owner SOUTH CHINA UNIV OF TECH
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