Multifunctional experimental device and method for supercritical carbon dioxide displacement of coal bed methane

Abstract

The invention relates to a multifunctional experimental device and method of supercritical carbon dioxide flooded coalbed methane and belongs to the multifunctional experimental device and method of coalbed gas. The device comprises a supercritical medium supply system, a methane supplying and dissolving system, a vacuumizing system, a pressurized flooding extraction system, a separating and collecting system and a signal acquisition system. The supercritical medium supply system and the methane supplying and dissolving system are connected to an input end of the pressurized flooding extraction system, and the pressurized flooding extraction system and the output end are separately connected to the vacuumizing system, the separating and collecting system and the signal acquisition system. The device has the advantages that a multifunctional experiment of flooding the coalbed methane by supercritical carbon dioxide and extracting a coal rock under the action of triaxial compression by means of special physical and chemical characteristics of supercritical carbon dioxide is simple in structure, complete in function and low in cost, and can realize the flooding rate test of methane in supercritical carbon dioxide flooded extraction process, coal rock fracture development rule and stress deformation monitoring and permeability change test before and after extraction.

Description

technical field [0001] The invention relates to a multifunctional experimental device and method for coalbed methane, in particular to a multifunctional experimental device and method for displacing coalbed methane with supercritical carbon dioxide. Background technique [0002] As a new type of clean energy, the exploration and development of coalbed methane has shown important value in improving my country's energy structure, alleviating the greenhouse effect and curbing coal mine gas disasters. Coalbed methane is mainly methane in an adsorbed state, and the adsorption capacity of methane is less than that of carbon dioxide. Therefore, taking advantage of the strong adsorption of carbon dioxide, injecting carbon dioxide into coal seams to replace methane can improve the recovery rate of coalbed methane and reduce greenhouse gas emissions. is a very effective way. Carbon dioxide is often in a supercritical state in deep coal seams. This is because the critical temperature ...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a multifunctional experimental device and method for supercritical carbon dioxide displacement of coalbed methane, so as to solve the problem of the inability to realize the displacement rate test of methane, the development law of coal rock cracks and the stress deformation in the process of supercritical carbon dioxide displacement and extraction. Issues with monitoring and testing permeability changes before and after extraction

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