Natural gas hydrate synthesis and mechanical testing integrated pressure chamber

Abstract

The invention discloses a natural gas hydrate synthesis and mechanical testing integrated pressure chamber. The natural gas hydrate synthesis and mechanical testing integrated pressure chamber comprises a base, an upper shell, an end cover, two telescopic casing pipes and a built-in heat exchanger, wherein the upper shell and the base which is arranged at the bottom of the upper shell are fixedly connected to form a closed pressure cavity; the base and the end cover are respectively provided with an upward lug boss and a downward lug boss, a calibration sample is arranged in the pressure cavity, and a first inlet-outlet pipeline, a second inlet-outlet pipeline, a third inlet-outlet pipeline, a fourth inlet-outlet pipeline, a seventh inlet-outlet pipeline and an eighth inlet-outlet pipeline are arranged in the base; a fifth inlet-outlet pipeline and a sixth inlet-outlet pipeline are arranged in the end cover, a seventh inlet-outlet pipe and an eighth inlet-outlet pipeline are also arranged in the base, the built-in heat exchanger is fixed in the pressure cavity and connected with a constant-temperature control system, and a force transmission shaft is connected with a tri-axle instrument. A hard material is used for substituting a pressure-resisting hose in the pressure cavity so as to improve the pressure resistance of a pipeline, so that the designed pressure of the pressure chamber can be increased.

Description

technical field [0001] The invention relates to an integrated pressure chamber for in-situ synthesis and decomposition of natural gas hydrate in sediments and testing its mechanical properties with a triaxial instrument, especially a mechanical property of an in-situ gas-solid reaction system under high pressure and low temperature Pressure chamber for testing. Background technique [0002] Natural gas hydrate is an ice-like solid formed by gas (or volatile liquid) and water under certain temperature and pressure conditions, commonly known as combustible ice, widely distributed in the tundra 200-2100 meters below the surface and between the seabed at the continental margin In the sediment of 0-1100 meters below. The natural gas hydrate reserves in the world are very huge, and the natural gas resources in hydrates are estimated to be 2×10 16 m 3 , equivalent to 2×10 5 100 million tons of oil equivalent, which is twice the total carbon content of conventional fuels in the ...

AI Technical Summary

Problems solved by technology

The current pressure chamber can realize bottom air intake or top air intake, and some also realize simultaneous bottom and top air intake, but the top and bottom are mostly connected by pressure-resistant hoses, the overall pressure resistance is not high, and it is easy to leak, slightly Improper operation will waste all the previous efforts of the experiment, resulting in high design pressure of the experimental equipment reported so far, but there are few experimental data reports under high pressure (greater than 10MPa)

The connection of the pressure-resistant hose is easy to be damaged, the equipment needs frequent maintenance, and it is troublesome to install the sample. The operation must be strictly in accordance with the operating regulations, and sometimes it cannot be operated by a single person. It is difficult for a single person to ensure that the sample is installed vertically.

A small part of the inner end cover of the pressure chamber and the base are connected by a metal capillary. The capillary solves the problem of pressure resistance and sealing, but due to the use of sediment, it is easy to cause capillary blockage

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