Experiment device for replacing CH4 in adsorption storage layer by multi-phase-state CO2 and mixed gas

Abstract

The invention discloses an experiment device for replacing CH4 in an adsorption storage layer by multi-phase-state CO2 and mixed gas, comprising a gas source supply system, a liquid-state CO2 supply system, a pressurizing device, an oil bath heating groove, a gas distribution tank, a three-axis chamber, a gas collection and analysis system and a vacuum-pumping system, wherein the gas source supply system is directly communicated with the gas distribution tank; the liquid-state CO2 supply system is communicated with the gas distribution tank through the pressurizing device; the gas distribution tank is communicated with a gas injection opening of the three-axis chamber; a gas outlet of the three-axis chamber is respectively communicated with the gas collection and analysis system and the vacuum-pumping system; and the three-axis chamber and the three-axis chamber are placed into the oil bath heating groove. According to the experiment device disclosed by the invention, a process of replacing the CH4 in the adsorption storage layer (a coal layer and a shale gas storage layer) by different phase states of CO2 (a supercritical state and a gas state) under the effect of multi-field coupling effect can be simulated; and a process of replacing the CH4 in the adsorption storage layer by different mixed gases can also be simulated, so as to provide an experiment platform for relative experiments and mechanism researches.

Description

technical field [0001] The invention relates to a gas displacement adsorption reservoir for CH 4 The experimental setup, especially involving a heterogeneous CO 2 and mixed gas to displace and adsorb CH in the reservoir 4 experimental device. Background technique [0002] The greenhouse effect produced by the large amount of carbon dioxide emitted in the process of national economic construction has seriously threatened the entire natural ecology and life safety. Carbon dioxide emission reduction has become a major issue that all mankind must face and urgently need to solve. Among the many ways to reduce carbon dioxide emissions, CO 2 Permanent underground storage is one of the most effective and realistic methods. The underground storage sites for carbon dioxide mainly include oil and gas fields, unminable coal seams, deep saline aquifers and shale gas reservoirs, etc. Injecting carbon dioxide into oil and gas fields is mainly for the purpose of enhancing recovery, mo...

AI Technical Summary

Problems solved by technology

However, the existing experimental devices can only inject CO 2 Gas displacement adsorption of CH in the reservoir 4 Experiment, cannot effectively control CO 2 phase state, especially incapable of supercritical CO 2 Displacing and adsorbing CH in the reservoir 4 Experimental research has greatly restricted the research progress of related technologies

In addition, using CO 2 with N 2 Equivalent mixed gas displacement and adsorption of CH in the reservoir 4 research, due to the ability to reduce CO 2 The separation cost is also gradually paid attention to, but the existing experimental device lacks the corresponding mixing and gas distribution device, so it is not convenient and quick to carry out related experiments

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