A visual test device for mechanical properties of natural gas hydrate deposits

Abstract

The invention relates to a visual natural gas hydrate sediment mechanical property testing apparatus, belonging to the field of the measurement of basic natural gas hydrate physical properties. The visual natural gas hydrate sediment mechanical property testing apparatus mainly comprises an automatic-pressing triaxial apparatus main machine, an axial loading system, a confining pressure control system, a backpressure control system, a temperature control system, a data collection system and an X-ray CT (computed tomography) imaging system. The low-temperature high-pressure hydrate triaxial apparatus is organically combined with the X-ray CT imaging system, so that the testing on macro and micro mechanical properties of natural gas hydrate sediments can be synchronously carried out. The visual natural gas hydrate sediment mechanical property testing apparatus can simulate a stress state of a real reservoir stratum, macro and micro mechanical property data of the natural gas hydrate sediments can be acquired, the important significance on disclosing a deformation mechanism of the natural gas hydrate reservoir stratum and a triggering mechanism of geological hazards such as submarine landslide caused by the decomposition of natural gas hydrate can be realized, and an important guiding function for safely and high efficiently exploiting the natural gas hydrate can be realized.

Description

technical field [0001] The invention relates to a visual test device for the mechanical properties of natural gas hydrate deposits, which belongs to the field of basic physical property measurement of natural gas hydrate. Background technique [0002] Natural gas hydrate has the characteristics of wide distribution, large amount of resources, shallow burial, high energy density, and cleanliness. It is the largest unknown energy pool that has not yet been developed on the earth. It is considered to be the most ideal new energy source with commercial development prospects in the 21st century. The safe exploitation of natural gas hydrate has been widely valued by scientists and governments of various countries, and has become a new research hotspot in the oil and gas industry, and may have a profound impact on the development of environmental science and energy industry. In the process of natural gas hydrate exploration and production, the decomposition of hydrate will affect t...

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Problems solved by technology

However, at present, there is no experimental device capable of studying the micromechanical properties of gas hydrate sediments in the world, and it is impossible to obtain microscopic data such as pore structure evolution and particle migration inside the sediments. little is known

Due to the problems of poor penetrability, large volume and heavy weight, the existing natural gas hydrate triaxial tester cannot realize the organic combination with visualization devices such as X-ray CT (for example, the inspeXioSMX-255CT stage has a load capacity of ≤9kg and can accommodate The height of the sample is ≤30cm, and the sample needs to be rotated during the scanning process), it is urgent to develop a visual test device for the mechanical properties of natural gas hydrate deposits

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