Supercritical-state gas adsorption desorption apparatus and application method thereof

Abstract

The invention relates to a supercritical-state gas adsorption desorption apparatus and an application method thereof. The apparatus is capable of simulating gas isothermal pressurization absorption, isothermal pressure-reduction desorption and isotope fractionation experiments under stratum conditions. The apparatus comprises a gas feed system, a pressurization system, a vacuumization system, a gas adsorption desorption system, a gas acquisition and analysis system, and a data acquisition and processing system. The apparatus is capable of realizing isothermal pressurization absorption and isothermal pressure-reduction desorption experiments, the sampling point quantity is more and is controllable according to experiment requirements, the adsorption and desorption trends are relatively well reflected, also the temperature in the experiment process is controllable, the oil bath temperature is set according to experiment requirement, relatively similar effect compared with actual stratum conditions is realized, shale gas exploitation is simulated through an isothermal pressure-reduction process, so that the stratum-condition maximum gas desorption amount is calculated. Operation in the experiment process is simple and safe, and error caused by human factors is reduced by acquiring data through the data acquisition and processing system. The apparatus is widely applicable to gas adsorption and desorption experiment processes.

Description

technical field [0001] The invention relates to a gas adsorption and desorption device and its usage method, in particular to a supercritical state gas adsorption and desorption device and its usage method. Background technique [0002] Shale gas content has always been the focus of people's research. Previous studies have shown that shale gas is mainly in free and adsorbed states. Therefore, it is necessary to study the adsorption capacity of shale gas under high temperature and high pressure conditions. At present, there are many commercial experimental devices for studying the adsorption and desorption properties of shale or coal rocks, such as 3H-2000PHD adsorption and desorption analyzer, IS-100 isothermal adsorption and desorption instrument, ISO-300 isothermal adsorption instrument, but they involve high temperature and high pressure supercritical gas There are very few adsorption and desorption instruments, such as the SH-ISO-01 gravity method shale gas coalbed metha...

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Problems solved by technology

The SH-ISO-01 gravity method shale gas and coalbed methane isothermal high-pressure adsorption instrument also has similar problems, and it cannot analyze the competitive adsorption and isotope fractionation of multi-component gases, and cannot complete the gas displacement experiment of simulating formation conditions

Li Jijun described in detail a high temperature and high pressure adsorption and desorption device designed in "A High Temperature and High Pressure Adsorption and Desorption Device and Its Application Method", which can realize high temperature and high pressure gas adsorption experiments and displacement experiments, and can analyze isotope fractionation in the gas adsorption process , but the number of samplers is five, which limits the number of experimental points, and the isothermal pressure-boosting adsorption and isothermal depressurization desorption experiments cannot be carried out.

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