Natural gas hydrate permeability measuring device

Abstract

The invention provides a natural gas hydrate permeability measuring device. The natural gas hydrate permeability measuring device comprises a permeation chamber, a temperature measurement and controlsystem and an air compressor. The permeation chamber includes an outer chamber and an inner chamber, the inner chamber is provided with a rubber mold, two permeable rocks are arranged up and down andclamped in the rubber mold, a natural gas hydrate pattern is wrapped by the rubber mold and clamped between the two permeable rocks, and a first space is arranged between the side wall of the inner chamber and the side wall of the outer chamber. The temperature measurement and control system communicates with the first space, a second space is arranged between the side wall of the rubber mold andthe side wall of the inner chamber, and the air compressor communicates with the second space through a confining pressure inlet pipe. The air compressor is connected to the permeable rocks located below by a permeation system, one ends of a row of discharge pipes are connected with the permeable rocks located above, and the other ends of the discharge pipes extend out of the permeation chamber tobe connected with a vacuum pump, a gas recovery device and a liquid flow measurement device separately. A methane gas cylinder is connected to the permeation system, the permeation system is internally provided with a gas flow meter, and a differential pressure measuring system is used for measuring the differential pressure in and out of the permeation chamber.

Description

technical field [0001] The invention relates to the technical field of natural gas hydrate development, in particular to a gas hydrate permeability measuring device. Background technique [0002] Natural gas hydrates widely exist in the submarine continental shelf and plateau permafrost, and form clathrate crystalline compounds from sufficient gas source (mainly methane) and water under high pressure and low temperature environment, which are mainly divided into two types: type I and type II. Since 1 volume of natural gas hydrate can release 164 volumes of natural gas, natural gas hydrate is considered to be the most promising clean new energy in the new century, with extremely abundant reserves. How to safely exploit natural gas hydrates has attracted great attention from scientists and governments of various countries, and has become a new hot spot to solve the energy crisis. [0003] However, there are still many technical difficulties and environmental disasters in orde...

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Problems solved by technology

However, the environment conditions for the occurrence of hydrate deposits are high pressure and low temperature, and ordinary permeability measurement devices cannot guarantee the formation and stable existence of hydrate deposits, so special devices are needed to simulate the corresponding environment

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