Experimental device for exploiting natural gas hydrate through combination of pressure reduction and carbon dioxide replacement

The utility model particularly relates to an experimental device for exploiting natural gas hydrate by combining pressure reduction with carbon dioxide replacement, which comprises a circulating water bath box, a horizontal reaction kettle, a gas collecting tank, a gas source tank, a methane gas cylinder, a carbon dioxide gas cylinder, a vacuum pump and a data acquisition and analysis module, the horizontal reaction kettle is used for preparing a natural gas hydrate sample, one end of the horizontal reaction kettle is connected with the gas collecting tank through a pipeline, the other end of the horizontal reaction kettle is connected with the gas source tank through a pipeline, the gas collecting tank is connected with the methane gas cylinder through a pipeline, and the gas source tank is connected with the carbon dioxide gas cylinder through a pipeline. A depressurization method is combined with a carbon dioxide replacement method, carbon dioxide is injected at the injection end at constant pressure, meth