Experimental device and experimental method for replacement and adsorption of binary gas in porous medium

Abstract

The invention discloses an experimental device and an experimental method for displacement and adsorption analysis of binary gas on a porous medium. The experimental device comprises a vacuum system, a gas supply system, an adsorption system and an analysis system. The vacuum system can be used for emptying gas in the adsorption device. The gas supply system injects different gases into two gas storage tanks respectively. The adsorption system comprises a heating constant-temperature box, a first gas storage tank, a second gas storage tank and a sample tank. The gas in the first gas storage tank is adsorbed on a sample in advance, after balance is achieved, the gas in the second gas storage tank is injected into the sample tank, and due to the difference of the adsorption capacity, the gas injected later replaces the gas adsorbed in advance, and balance is achieved. The analysis system can detect the components of the free gas in the sample tank and calculate the replacement efficiency of the gas. The device can simulate and test the replacement effect of injected carbon dioxide on adsorbed shale gas at high temperature and high pressure, and has important significance for improving the recovery ratio of the shale gas and geological storage of the carbon dioxide.

Description

technical field [0001] The invention relates to the technical field of carbon dioxide injection to enhance the recovery of shale oil reservoirs, in particular to an experimental device and an experimental method for displacement and adsorption of binary gas on porous media. Background technique [0002] At present, hydraulic fracturing and horizontal drilling are the common exploitation techniques for shale oil and gas resources, but this technique will cause many environmental problems, such as groundwater pollution, migration of chemical elements, and induction of deep earthquakes. At the same time, the extraction efficiency of this technology is not high, only 15%, especially the shale gas that exists in the micropores in the adsorbed state in the reservoir has not been extracted, and this part accounts for 40% to 80% of the total reserves. [0003] The size of microscopic pores in shale is mostly nanoscale, and water cannot effectively enter without destroying the origin...

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Problems solved by technology

[0008] The purpose of the embodiments of the present invention is to provide an experimental device for displacement and adsorption reaction of binary gas in porous media, so as to solve the existing problem of simulating carbon dioxide injection to replace adsorbed shale gas

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