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

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...

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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 distribution of hydrates. Most of them use cyclopentane and TBAB (tetrabutylammonium bromide) to form hydrates under atmospheric pressure. The conditions for the formation of

The nucleation and growth of hydrates have a certain degree of randomness, and a single experiment cannot reflect the laws and characteristics of hydrate growth and decomposition, especially under the complex conditions of porous media and thermal mass enhancement materials.

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