An experimental device and method for synthesizing marine natural gas hydrate samples

Abstract

The invention discloses an experimental device for synthesizing marine natural gas hydrate samples, which comprises a reaction kettle, an axial pressure piston, an outer jacket of the kettle, an injection system, an axial pressure control system, a confining pressure control system and an output system. The invention also discloses an experimental method for preparing marine natural gas hydrate samples by using the above-mentioned experimental device. Firstly, ice powder particles are made, and then the ice powder particles are mixed with dried porous medium particles, and placed in a low temperature environment below zero. In the high-pressure reactor to simulate the geomechanical properties of the seabed, methane gas is injected to generate hydrate, and the ice is directly converted into hydrate. Finally, the free gas in the reactor is driven out through the liquid injection system. The present invention can economically, effectively and accurately obtain real marine natural gas hydrate samples under various geological conditions and various occurrence conditions that are difficult to obtain, making hydrate research closer to reality, and providing research on natural gas hydrate exploitation. Experimental basis.

Description

technical field [0001] The invention relates to the field of natural gas hydrate exploitation, in particular to an experimental device and an experimental method for generating synthetic marine natural gas hydrate samples. Background technique [0002] Natural gas hydrate (Natural Gas Hydrates, NGH) is produced from light hydrocarbons, CO 2 and H 2 The white solid crystalline substance (commonly known as combustible ice) formed during the interaction between small molecule gases such as S and water (commonly known as combustible ice) is a non-stoichiometric crystalline compound, or clathrate hydrate, gas hydrate. The main component of natural gas in NGH that exists in nature is methane (>90%), so it is often called methane hydrate (Methane Hydrates). Theoretically, in a saturated methane hydrate molecular structure, the molar ratio of methane to water is 1:6, and under standard conditions, the volume ratio of methane gas to methane hydrate is 164:1, that is to say, the ...

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Problems solved by technology

However, the method of hydrate formation is often too simple. Usually, hydrates are synthesized by mixing gas and liquid in quartz sand. There is no experimental device and method for synthesizing marine gas hydrate samples under real conditions.

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