Effect of Coal Gas Petrographic Composition on Gas Recovery in the Wells


Annotation:

Coal material composition is considered as a data set on the mineralogical inclusions in solid minerals, on chemical compounds of minerals and petrographic varieties, which significantly effects on the processes and parameters of gas release in the mines. In this case, the main petrographic components of coal are separated into the groups of vitrinite, semivitrinite, fusinite, and leuptinite with their microcomponents of both organic and mineral nature, complexity of their elemental and chemical composition.
Known methods for studying the petrography of coal make it possible to separately evaluate the complexity of their composition and the degree of metamorphism, predict the properties of coal. But mining science has not yet disclosed the link of the material and petrographic composition of coal with the processes and parameters of gas release from coal seams to the workings and degassing wells, which is very important for mines where gas-bearing strata and formations are developed that are dangerous and prone to sudden emissions of coal and gas. Only the indicator of the volatile matter yield is to some extent an exception, since it is used in identifying the parameters of the downhole degassing of the coal massif.
The issues of the effect of volatile agents on the methane content of coal seams, petrographic microcomponents of fusinite and vitrinite on the intensity of initial methane release into wells and the rate of its decrease over time are studied using the example of 15 Kuzbass strata with volatile agents yield of 20–20 % m3/t dry of ash-free mass, fusinite 5–40 %, vitrinite 72–95 %. Satisfactory repeatability of the predicted and measured gas release values into wells was shown. The results of the study are presented in the nomograms, by which it is possible to forecast gas recovery indicators of coal seams in the wells of preliminary degassing.

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DOI: 10.24000/0409-2961-2019-1-14-18
Year: 2019
Issue num: January
Keywords : mine degassing well coal bed methane content gas recovery indicators fusinite vitrinite
Authors:
  • Zaburdayev V.S.
    Zaburdayev V.S.
    Dr. Sci. (Eng.), Lead Researcher, sabyanina@mail.ru IPCON RAN, Moscow, Russia