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Measuring method for isothermal adsorption/desorption curve of coaly shale

A technology of isothermal adsorption and desorption curves, applied in the direction of analyzing materials and instruments, can solve the problems affecting the reliability of experimental results, and achieve the effect of less data processing and calculation workload, ensuring reliability and ensuring loading accuracy.

Active Publication Date: 2014-04-16
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

However, the existing test methods in China measure the isothermal adsorption / desorption curves of real coal shale reservoirs under the coupling of multiple fields such as in-situ stress field and temperature field, which in turn affects the credibility of the experimental results.

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  • Measuring method for isothermal adsorption/desorption curve of coaly shale
  • Measuring method for isothermal adsorption/desorption curve of coaly shale
  • Measuring method for isothermal adsorption/desorption curve of coaly shale

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Embodiment Construction

[0037] The present invention will be further described below in conjunction with the accompanying drawings and examples, but the implementation scope of the present invention will not be limited.

[0038] The present invention is explained below by taking the isothermal adsorption / desorption experiment of methane (purity>99.99%) in a coal sample in the southern Qinshui Basin as an example.

[0039] see figure 1, first put the drilled raw coal coal sample of Φ50×100mm in a constant temperature and humidity box saturated with water for testing. Put the coal rock or shale sample test piece into the true triaxial core clamping and pressurizing system 12; turn on the power supply of the thermostat 13, set the experimental temperature at 23°C according to the actual formation temperature, and monitor the core clamping by the system temperature sensor 14 the temperature in the holder; and empty the triaxial pressure chamber of the true triaxial core holding and pressurization system...

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Abstract

The invention provides a measuring method for an isothermal adsorption / desorption curve of coaly shale. The measuring method mainly comprises the following steps of: placing a coaly shale specimen into a true triaxial core clamping system; setting an initial measuring state of the specimen according to the actual stratigraphic condition; carrying out an adsorption / desorption experiment on the specimen after the volume of a free pore is calibrated; respectively measuring and recording a cumulative flow value of gas at an inlet end or outlet end and a balanced system pressure value according to a high-precise gas mass flow meter at the inlet end or outlet end and a system pressure sensor; calculating to obtain the volume of the absorbed gas; and then, drawing the isothermal adsorption / desorption curve of the coaly shale specimen. By using the measuring method, influences of a strain field, a temperature field and the like to the adsorption / desorption of gas on the surface of the coaly shale can be truly reflected, experiments carried out under the influence of single factor and experiments carried out under the coupled action of multiple factors can be achieved, and the measured adsorption / desorption curve can be used for truly representing the adsorption / desorption characteristic for gas in an actual coaly shale reservoir.

Description

Technical field: [0001] The invention relates to a method for measuring the gas adsorption / desorption amount and isothermal adsorption / desorption curve on the surface of coal shale, especially for measuring the gas adsorption / desorption amount and Method for adsorption / desorption isotherms. Background technique: [0002] At present, the experimental methods for measuring the isothermal adsorption / desorption curve of gas in coal shale mainly include pressure method, volumetric method and gravity method. The pressure method is the most commonly used method at present, and its experimental equipment is mainly composed of a gas cylinder, a vacuum pump, a reference cylinder, a sample cylinder, a pressure gauge, and a constant temperature oil bath (or constant temperature box). During the experiment, first fill the reference cylinder with gas, measure and record the pressure of the reference cylinder after the pressure is stable; then connect the sample cylinder with the referenc...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N7/00
Inventor 冯其红张先敏张纪远李晓东王建强赵希春李加祥
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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