Mineev S.P., Kocherga V.M., Korneev Yu.A., Yanzhula O. S., Gulay O.O., Samopalenko P.M. Research of the methan content effecting on gas-draine efficiency in the stope when boreholes are left in uncontrollable workings

Details
Parent Category: Geo-Technical Mechanics, 2018
Category: Collection of scientific papers «Geotekhnicheskaya Mekhanika» Issue 141

Geoteh. meh. 2018, 141, 107-123

https://doi.org/10.15407/geotm2018.141.107

RESEARCH OF THE METHAN CONTENT EFFECTING ON GAS-DRAINE EFFICIENCY IN THE STOPE WHEN BOREHOLES ARE LEFT IN UNCONTROLLABLE WORKINGS

1Mineev S.P., 1Kocherga V.M., 2Korneev Yu.A., 3Yanzhula O. S., 3Gulay O.O., 4Samopalenko P.M.

1Institute of Geotechnical Mechanics named by N. Polyakov of National Academy of Sciences of Ukraine, 2SE «Myrnogradvugillya», 3MM «Pokrovskoye», 410 detachment of SMMRS (Mirnograd)

UDC 622.411.33

Language: Russian

Annotation. 
Most of the highly productive lavas in coal mines in Ukraine are processed by a pillar-based development system, and most of them are ventilated according to the 1-M schemes, when the outgoing ventilation stream is directed towards the coal massif and the ventilation output is not maintained and is not controlled . Therefore, degassing wells are drilled ahead of the stope to meet its movement. The number of wells operating simultaneously until their mouths are completed, usually does not exceed three. Such wells communicate with the roof rocks unloaded from the rock pressure in the immediate vicinity of the face where the methane release from undermined coal beds and rocks does not reach a maximum. This limits the flow rate of wells and their efficiency, as a rule, does not exceed 30%. To increase the efficiency of degassing, wells are left that are connected to the gas pipeline in the uncontrolled part of the ventilation preparation after the cleaning face. In some cases, the use of this event made it possible to increase the efficiency of wells by 1.5-2.0 times and reach 75%. In some cases, the wells and pipelines were destroyed, the methane content in the gas being captured fell and the desired effect was not achieved.  To achieve the efficiency of degassing, an assessment was made of the effect of rock displacement on the aerodynamic resistance of methane paths to the well, depending on the methods of its protection for reservoir conditions d4 of unit No. 3 of the Shuv Pokrovskoe. As a result of the studies, the established reality of ensuring the effectiveness of roof degassing by wells drilled towards the face at a level of 60-75%, provided that they are protected from destruction. Reliable protection of the wells and the uncontrolled part of the ventilation output, as well as the reduction of air leaks through the worked out space due to the laying of solid churakov jumpers, additionally increases the degassing efficiency. Thus, the protection of wells in the uncontrolled part of the ventilation output can significantly increase the efficiency of degassing, not only wells, but also "candles". Improving the efficiency of roof drainage by wells leads to an increase in the flow of methane from the reservoir under development, bypassing the clearing generation into the developed space due to the vacuum created by the vacuum pump in the wells.
Key words: coal seam, degassing wells, degassing, production, working out.

References

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About the authors:

MineevSergeyPavlovich, Doctor of Technical Sciences (D.Sc.), Professor, Head of the Department of Pressure Dynamics Control in Rocks of the Institute of Geotechnical Mechanics by N. Polyakov of National Academy of Sciences of Ukraine (IGTM NASU), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. ,

Kocherga Viktor Nikolaevich, Candidate of Technical Sciences (Ph.D.), Chief Technologist sn the Department of Pressure Dynamics Control in Rocks of the Institute of Geotechnical Mechanics by N. Polyakov of National Academy of Sciences of Ukraine (IGTM NASU), Dnipro, Ukraine 
Korneev Yury Genadievich, Master of Science, General Director of the State Enterprise “Mirnogradugol”, Pokrovsk, Ukraine
Yanzhula AlexeySergeyevich, Master of Science, Chief Engineer of MM “Pokrovskoye”, Pokrovsk, Ukraine
Gulay Alexey Alexandrovich, Master of Science, Principal Engineer in VTB Department of MM "Pokrovskoye", Pokrovsk, Ukraine
Samopalenko Petr Mikhailovich, Master of Science, Deputy Head of the 10th detachment of the State Militarized Mine Resque Parts, Mirnograd, Ukraine