Device and method for measuring hydrate deformation in supergravity autoclave based on image features

Abstract

The invention discloses a device and method for measuring the deformation of hydrate in a supergravity autoclave based on image features. The top of the autoclave is equipped with a lid and placed in a super-gravity environment. A hydrate simulation reservoir and high-pressure water are installed inside the autoclave. A square metal sheet is arranged on the hydrate simulation reservoir. The base is covered with a hemispherical tempered glass cover and fixed on the autoclave. On the bottom of the cover, there are high-speed cameras, ring LED lamps and air pressure sensors inside the hemispherical tempered glass cover; the hemispherical tempered glass cover is used to separate the experimental device from the high-pressure water body, and the number of pixels occupied by the square metal sheet in the photo field of view is calculated to calculate the square metal The distance between the thin plate and the high-speed camera is used to obtain the surface deformation of the hydrate simulated reservoir. The invention is easy and quick to operate, the test result is reliable and accurate, and it can work in the environment of low temperature, high pressure and supergravity field to measure and calculate the deformation problem of the surface of the hydrate reservoir, and it is useful for studying the surface deformation caused by the natural gas hydrate in the seabed reservoir. Deformation problem provides scientific basis.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering and geological engineering, and relates to a high-gravity environmental material measurement device and method, and relates to a high-gravity high-pressure autoclave deformation measurement device and method based on image features, which are suitable for studying and simulating seabed hydrate The problem of surface deformation of hydrate reservoirs during mining. Background technique [0002] Natural gas hydrate is a cage-like crystalline compound formed by natural gas molecules (mainly methane) and water molecules under high pressure and low temperature conditions. Natural gas hydrate can exist stably only in a low-temperature and high-pressure environment. When the temperature rises or the pressure drops, 1 volume of natural gas hydrate decomposes and releases about 164 volumes of methane gas, so it is also called "combustible ice". With the characteristics of wide distributio...

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Problems solved by technology

[0004] In the high-gravity experiment of hydrate mining, faced with underwater high-pressure, low-temperature extreme conditions and a high-gravity environment, the force of the conventional displacement gauge is dozens or even hundreds of times that of the normal gravity experiment, and its normal working performance is greatly challenged , it is difficult to accurately measure the deformation of the hydrate reservoir surface, and the effective measurement of the reservoir deformation in the high gravity experiment of hydrate mining is still blank

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