Experiment device and method for synthesizing marine natural gas hydrate sample

Abstract

The invention discloses an experiment device for synthesizing a marine natural gas hydrate sample. The device comprises a reaction kettle, an axial compression piston, a kettle outer jacket, an injection system, an axial compression control system, a confining pressure control system and an output system. The invention further discloses an experiment method adopting the experiment device for synthesizing the marine natural gas hydrate sample. The method comprises the steps that firstly, ice powder particles are manufactured, then, the ice powder particles and dried porous medium particles are mixed and placed into the high-pressure reaction kettle in the subzero low-temperature environment so as to simulate seabed geomechanical properties, then, methane is injected to generate a hydrate, ice is directly converted into the hydrate, and finally free gas inside the reaction kettle is removed through the liquid injection system. According to the experiment device and method, true marine natural gas hydrate samples which are hard to obtain on various geological conditions and various occurrence form conditions can be economically, efficiently and accurately obtained, the research on the hydrate is closer to the reality, and the experiment basis is provided for research of natural gas hydrate exploitation.

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 formed 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 (MethaneHydrates). 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 Th...

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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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