Experimental device and method for promoting coal-bed methane extraction by utilizing ultrasonic waves and high-temperature CO2

Abstract

The invention discloses an experimental device and method for promoting coal-bed methane extraction by utilizing ultrasonic waves and high-temperature CO2. The experimental device comprises a coal androck sample pressure bearing assembly, a confining pressure application assembly, an axial pressure application assembly, a simulated coal-bed methane filling assembly, an ultrasonic generation assembly, a high-temperature CO2 filling assembly, a temperature control assembly and a flow detection assembly. The experimental method comprises the following steps: mounting a coal and rock sample in the coal and rock sample pressure bearing assembly; performing simulated crustal stress loading on the coal and rock sample by the confining pressure application assembly; performing simulated coal-bedmethane adsorption on the coal and rock sample by the simulated coal-bed methane filling assembly; performing ultrasonic loading on the coal and rock sample through the ultrasonic generation assembly;performing displacement on the simulated coal-bed methane in the coal and rock sample through the high-temperature CO2 filling assembly; performing temperature monitoring on the high-temperature CO2filling assembly and the coal and rock sample by the temperature control assembly; and performing flow detection on the simulated coal-bed methane subjected to displacement in the coal and rock sampleby the flow detection assembly.

Description

technical field [0001] The invention belongs to the technical field of coal mining, and in particular relates to a 2 Experimental device and method for promoting coalbed methane extraction. Background technique [0002] Coalbed methane is an associated resource of coal, which belongs to unconventional natural gas. It is mainly stored in coal seams in the state of adsorption. The main component of coalbed methane is methane, and the proportion of methane can reach more than 95%. [0003] As the country pays more and more attention to the development and utilization of new energy, the mining of coalbed methane has gradually moved from the research stage to the stage of development and utilization, and the development and utilization of coalbed methane is very important to my country's industrial development. Demand can also improve environmental pollution, and more importantly, it can greatly improve the safety production conditions of coal mines, which can effectively reduce ...

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Problems solved by technology

[0005] At present, the main method used in my country to promote the extraction of coalbed methane is hydraulic fracturing, but hydraulic fracturing consumes a lot of water resources, and the application cost is high, and it has a relative degree of restriction on the mining efficiency of coalbed methane. At the same time, the fracturing fluid will also cause certain pollution to groundwater resources.

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