METHANE IN COAL BED MASS TRANSFER PARAMETERS DETERMINATION METHOD Russian patent published in 2017 - IPC E21F17/00 

FIELD: measuring equipment.

SUBSTANCE: methane in coal bed mass transfer parameters determination method is offered. In accordance with this method, one takes the coal sample in the shape of the coal culm out of the coal bed and its temperature measuring, the samples preparation by dint of the coal culm selection in the form of the coal grains grain, the samples placement in the measurement chamber, the chamber hermetic encapsulation and the desorbing into the measurement chamber methane pressure measurement. One defines the maximum permissible gas-bearing capacity of the coal bed as the proportion of the product of the methane pressurization in the measurement chamber and its volume to the coal density, the atmosphere pressure, the coal sample volume and the dimensionless parameter. One estimates the coal porosity in a laboratory environment. For doing this, one places the sample into the high-pressure chamber, pressurizes it, saturates the sample with methane under the pressure, which is equal to the directionless strata pressure component, and under the temperature, which is equal to the coal bed temperature, till the sorption equilibrium. One relieves the pressure up to the atmosphere one, plugs the chamber to the measuring device and rates the methane from the coal sample pressure change. One estimates the porosity as the rate of the methane pressure in the measurement chamber and the chamber's volume to the product of the pressure of the sorption equilibrium, the coal sample volume and to the dimensionless parameter. If the porosity is known, one defines the methane in the coal bed pressure as the ratio of the product of the methane pressure in the measurement chamber and the chamber's volume to the product of the coal porosity, the coal sample volume and to the dimensionless parameter. At the same time, it is assumed that the kinetics process of the gas desorption from the coal bed and from the sample are identical ones. The measurement chamber volume is selected equal to no less than 80 volumes of the coal sample.

EFFECT: method allows to simplify the measurement process and to improve the obtained results accuracy.

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