Method for simultaneously measuring high-pressure gas adsorption capacity and adsorption swell capacity of coal petrography and measuring equipment

Abstract

The invention provides a method for simultaneously measuring high-pressure gas absorption capacity and adsorption sell capacity of coal petrography and measuring equipment, which can simultaneously measure the adsorption capacity and adsorption swell capacity of the coal petrography in high-pressure gas at a pressure of 0-20MPa and a temperature of 0-80 DEG C. In the process of measurement, a measurement and control device is used for performing signal transformation and analog-to-digital conversion on electrical signals of a displacement sensor, a temperature-measuring hot resistor and a pressure transmitter; a computer is used for automatically receiving pressure, temperature and displacement signal data from the measurement and control device and recording and saving the received data; and a computer screen is used for displaying the pressure, temperature, adsorption capacity and swell capacity data timely in the process of measurement and the change law curves of the pressure, the temperature and the swell capacity with the change of time in real time. In the method of the invention, the measurement on the adsorption capacity and the adsorption swell capacity can be finished simultaneously, so that the method is simple and convenient and fast, and has the advantages of simple structure, reliable and safe high-pressure seal, easy operation, high measurement accuracy, high resistance to pressure and automatic measurement.

Description

technical field [0001] The invention belongs to a method and a measuring device for simultaneously measuring the adsorption amount and the adsorption expansion amount of high-pressure gas of coal rocks. Background technique [0002] Coal rock mass is a porous medium containing a large amount of adsorbed coalbed methane, and its mechanical properties have an important impact on coalbed methane mining. The pore characteristics, adsorption and desorption characteristics and geological control mechanism of coal and coal reservoirs have always been hot issues concerned by the coalbed methane and geological circles. The adsorption of coal is an important basis for evaluating the gas content and recoverability of coalbed methane. The understanding of the adsorption / desorption characteristics of coalbed methane has a profound impact on the evaluation of recoverable resources of coalbed methane and the numerical simulation of coal reservoir productivity. The kinetic model and mechan...

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Problems solved by technology

The test results show that the adsorption capacity of coal with the same degree of metamorphism varies within a certain range, and the adsorption capacity of coal in the same mine and the same coal seam can only reach a similar level.

[0007] The characteristics of the above measurement techniques and devices are that either they can only measure the amount of adsorption, or they can only measure the amount of deformation.

Among these measurement methods, powdered coal samples or lump coal samples are usually used as test samples for the adsorption capacity test, and lump coal samples are used for the adsorption expansion test. Since the adsorption capacity and adsorption expansion tests use different coal samples , and cannot simultaneously measure

As a result, the measured adsorption amount and adsorption expansion deformation cannot be well corresponded, and the measured adsorption amount and adsorption deformation are quite different from the actual values ​​of adsorption amount and adsorption deformation of coal rocks under in-situ conditions.

[0008] It is difficult to measure the adsorption amount and adsorption deformation simultaneously on a sample, so there are few reports on this work

At present, there is no related report on the device and measurement method for simultaneously measuring the adsorption capacity and adsorption deformation expansion on a sample.

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