RU2837100C1 - Method for forecasting gas recovery of coal mass - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: invention relates to a method for predicting gas recovery of a coal mass. Method involves making a cavity in the formation. It also includes coal sampling, measurement of volatile substances in coal, its gas saturation and gas release indices. Additionally, fracturing is measured. Also, content of fusinite in coal mass, its gas-dynamic connection with coal gas is determined. Also, gas flow dynamics is determined. Intensity of the initial gas release into the cavity from the taken sample is measured by the gas content in the fusinite.

EFFECT: determination – forecast – of gas recovery of coal substance.

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Description

Field of technology to which the invention relates

The invention relates to mining, primarily to the coal industry, and can be used to determine the gas hazard of a coal seam at a mining site.

State of the art

A method is known for predicting the gas hazard of a coal mine, stopes during underground coal mining, which includes conducting workings in the plane of the coal seam, determining the gas-dynamic indicators of the coal massif (Instructions for degassing. Series 05. Issue 22 M.: ZAO NTC PB, 2012.-250 p. (pp. 104-106, 136-138).

The disadvantage of this method is that when determining the gas recovery of a coal massif, the petrographic parameters of the coal are not taken into account.

A method is known for predicting gas recovery from a coal seam, which includes conducting workings along the seam in the extraction area, determining the gas content and gas recovery of the coal massif, and the intensity of methane emission into mine workings /Methane in Mines and Quarries of Russia: Forecast, Extraction, and Use/ A.D. Ruban, V.S. Zaburdyaev, G.S. Zaburdyaev, et al. - Moscow: IPKON RAS, 2006. - 312 p. (pp. 21-25, 34-35).

The disadvantages of the method include the determination of the relative methane content of the extraction area (the methane indicator per ton of mined coal), which complicates the gas hazard at high loads on the longwall and coal fractions, and reduces the level of safety in terms of the gas factor.

The closest method for predicting gas recovery from a coal massif is a technical solution that includes conducting preparatory workings in a coal seam, determining the gas content of coal, its gas recovery indicators and the yield of volatile substances (gas, dust, coal and gas emissions in mines / V.S. Zaburdyaev, O.N. Malinnikova. Moscow; Vologda6 Infra Engineering, 2024. 152 p. (pp. 56-68, 84-86). Prototype.

The disadvantage of this method is that it determines the amount of methane per unit mass of the selected sample (the object being studied).

Disclosure of the essence of the invention

The aim of the invention is to determine (predict) the gas release of coal matter.

The method is implemented as follows:

A cavity is made in the coal seam, a coal sample is taken. The elemental composition of the sample taken is determined, the content of volatile substances in the coal, the saturation of the sample with gas, and the gas recovery of the seam are measured.

The distinctive feature of the method is that the content of fusinite capable of accumulating gases is determined in the coal mass. The content of fusinite in the coal mass promotes the growth of its sorption. Microcomponents of the fusinite group are present mainly in matte duren and semi-matte clarene-duren types of clays, the former of which contain the majority of fusinized microcomponents (within 12-32%), the sorption methane capacity is measured in the range of 20-40 milliliters per gram of combustible mass. The gas-dynamic connection of fusinite with coal gas is revealed, the intensity of the initial gas release from the selected sample is measured by the gas content in fusinite. All measurements are made using standard methods.

The method is implemented as follows:

In the mining allotment of the mine, during the preparatory work, a cavity is made in the seam, the content of volatile substances in the seam, the gas saturation of coal, its fracturing, the content of fusinite in the coal mass, the gas-dynamic connection of fusinite with coal gas are measured, the dynamics of gas outflow, the intensity of the initial release of gas into the cavity are determined. In this case, all operations are carried out according to standard methods.

Claims (1)

A method for predicting gas recovery from a coal massif, including creating a cavity in the seam, taking coal samples, measuring volatile substances in the coal, its gas saturation and gas emission indices, characterized in that cracking is additionally measured, the fusinite content in the coal mass is determined, its gas-dynamic connection with coal gas, the dynamics of gas outflow are determined, and the intensity of the initial gas emission into the cavity from the sample taken is measured based on the gas content in the fusinite.