Coal/shale adsorption capacity measuring device

Abstract

The invention relates to a coal / shale adsorption capacity measuring device, which comprises an adsorption cylinder and a reference cylinder, wherein cylinder bottoms of the two cylinders are respectively fixed on the top surface and the bottom surface of a cylindrical steel block; the adsorption cylinder and the reference cylinder are communicated through a communicating pipe which penetrates through the two cylinder bottoms and the cylindrical steel block; a first control valve is arranged on the communicating pipe; outer side walls of the adsorption cylinder, the reference cylinder and the cylindrical steel block are provided with heating jackets, and heat insulation jackets are arranged at outer sides of the heating jackets; all the combined members, namely the adsorption cylinder, the reference cylinder, the cylindrical steel block, the heating jackets and the heat insulation jackets, are placed in a vacuum heat insulation tank; a sample hanging basket which is filled with a test sample is arranged in the adsorption cylinder; the adsorption cylinder is provided with an exhaust pipe and a first pressure sensor; and the reference cylinder is provided with an air inlet pipe and a second pressure sensor, wherein the air inlet pipe is connected to one end of a gas boosting pump, and the other end of the gas boosting pump is communicated with experiment gas and helium through a second control valve and a third control valve which are communicated in parallel. The coal / shale adsorption capacity measuring device can be used for simulating the process of adsorbing natural gas by coal / shale under actual geological conditions and evaluating the adsorption capacity of the coal / shale.

Description

technical field [0001] The present invention relates to an experimental equipment for the simulation of the adsorption capacity and the determination of the adsorption capacity of coal / shale under actual geological conditions in laboratories in the fields of petroleum, geology, and mining, especially an adjustable high-temperature and high-pressure coal / shale isothermal Adsorption capacity measurement device. Background technique [0002] In conventional gas reservoirs, natural gas mainly occurs in the form of free in sandstone, and mainly in the form of adsorption and free in coal / shale. Therefore, the adsorption capacity of coal / shale is determined to be coalbed methane and shale Rock gas resource evaluation and favorable area prediction provide important parameters. At present, the methods for determining the methane adsorption capacity of coal rock / shale can be divided into gravimetric method, volumetric method and chromatographic method. The gravimetric method was wid...

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Problems solved by technology

The gravimetric method was widely used in the early days, but it could not realize the determination of adsorption capacity at higher pressure points

Chromatography can be used to determine the adsorption of multi-component gases, but more accurate data cannot be obtained

The volumetric method is the most widely used, but the measured temperature and pressure of the existing devices do not conform to the actual temperature and pressure environment of the formation, and cannot reflect the real adsorption capacity of coal / shale

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