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

Abstract

The invention discloses a device and a method for measuring deformation of hydrate in a supergravity autoclave based on image features. A kettle cover is arranged at the top of the high-pressure kettle, the high-pressure kettle is arranged in a supergravity environment, a hydrate simulation reservoir and high-pressure water are arranged in the high-pressure kettle, a square metal sheet is arranged on the hydrate simulation reservoir, a base is covered with a hemispherical tempered glass cover and fixed to the bottom surface of the kettle cover, and a high-speed camera, an annular LED lamp tube and an air pressure sensor are arranged in the hemispherical tempered glass cover; the experimental device is separated from a high-pressure water body by using the hemispherical tempered glass cover, and the number of pixels occupied by the square metal sheet in the view of a picture is calculated to calculate the distance between the square metal sheet and the high-speed camera, so that the hydrate simulation reservoir surface deformation is obtained. The device is simple, convenient and rapid to operate, reliable and accurate in test result and capable of working in low-temperature, high-pressure and high-gravity field environments, the deformation problem of the hydrate reservoir surface is measured and calculated, and a scientific basis is provided for researching and exploiting the surface deformation problem caused by natural gas hydrates in seabed reservoirs.

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 production. 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 distrib...

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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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