Geoenvironmental aspects of mine methane emissions


Keywords: rocks, fluids filtration, methane, cracks, pores

Abstract

The purpose of the work is to reveal the regularities of the influence of the gaseous phase on the process of filtering carbonated liquid and to characterize the physi-cochemical processes during the implementation of the method of reducing mine methane emissions. The development of minerals can be accompanied by the release of a large amount of methane into the mined-out space. This leads to atmospheric air pollution and consequently to ecological disturbances. This causes methane emissions to the mined-out space and to the surface of the earth cause by the filtration processes of gases and liquids in the rocks. The intensity of fluid filtration through crack and pore systems depends on the content and properties of the fluids and the reservoir properties of the rocks. It is known that methane release to the atmosphere can be observed after mines have been mothballed. This is a problem for many countries around the world where coal and oil and gas fields are being exploited. Investment in methane production and utilization projects is therefore important. Research on fluids filtration processes allow for the development of effective methane recovery methods, and ways to reduce methane emission speed. The result is the reduced air pollution and an improved environmental situation. The paper presents the filtration properties of rocks with different structures and textures. Filtration of carbonated liquid (water-methane) in fractures and pores is considered. It found that an increase in methane concentration in the carbonated liquid leads to a decrease in the phase permeability coefficient for water and an increase for methane. This character of change in phase permeability leads to methane accumulation in crack and pores. The dependence of the average carbonated liquid filtration rate in a rectilinear fracture on the methane concentration and the fracture axis angle of inclination is obtained. The average ascending filtration speed of the carbonated liquid is determined to be greater than the average descending filtration speed. This is due to the effect of the ejection force that acts on the gas bubbles in the liquid. The authors propose a method of blocking methane seepage by physicochemical treatment of the rock mass. The methane blocking effect is achieved by creating a gas-tight zone in areas with a high risk of methane migration to the ground surface. The result is a reduction in methane emissions to the mined-out space and the environment. When the method is realized, the solid product of the polymer solution enters cracks with a disclosure greater than 6 μm or pore channels with an average diameter of 6 μm. At the same time, the water released by the destabi- lization of the polymer solution blocks the methane in small cracks and pores. In pore channels with an average diameter of less than 25 μm, there is a sharp increase in the dynamic viscosity of the polymer solution. This effect is due to an increase in the intermolecular interaction forces between the polymer solution and the walls of the filtration channels. Coagulation and destabilization of the polymer solution in cracks and pores is due to the separation of large agglomerates of macromolecules.

Author Biographies

Serhii P. Mineev
Institute of Geotechnical Mechanics named after N. Poljakov of National Academy of Sciences of Ukraine, Dnipro, Ukraine
Serhii А. Kurnosov
Institute of Geotechnical Mechanics named after N. Poljakov of National Academy of Sciences of Ukraine, Dnipro, Ukraine
Serhii Yu. Makeiev
Institute of Geotechnical Mechanics named after N. Poljakov of National Academy of Sciences of Ukraine, Dnipro, Ukraine
Leonid А. Novikov
Institute of Geotechnical Mechanics named after N. Poljakov of National Academy of Sciences of Ukraine, Dnipro, Ukraine

References

1. Agaev, R. A., Andreev, S. Yu., Makeev, S. Yu., Ryzhov, G. A., Sofiyskiy, K. K. (2017). Blokirovanie metana v ugol’nom plaste rastvorami polimerov [Methane blocking in the coal seam by solutions of polymers]. Heotekhnichna mekhanika: Mizhvid. zb. nauk. prats IHTM NAN Ukrainy, 135, 137-148 (In Russian).
2. Almukhametova, E. M., Gabzalilova, A. Kh., Garifullina, Z. A., Idrisova, A. T. (2017). Issledovanie dvizhenija zhidkosti i gaza v poristoj srede [Investigation of the motion of liquid and gas in porous medium]. Neft- egazovoe delo, 15(4), 73-76. doi: 10.17122/ngde- lo-2017-4-73-76 (In Russian).
3. Basiiev, K. S., Kochina, I. N., Maksimov, V. M. (1993). Podzemnaja gidromehanika [Underground Hydromechanics]. Nedra, Moscow (In Russian).
4. Bokij, A. B., & Kostenko, V. K. (2013). Povyshenie jekologicheskoj bezopasnosti prirodno-promyshlennoj sistemy ugol’noj shahty putem sokrashhenija jemissii metana [Іncreasing the environmental safety of natural and industrial systems of coal mines by reducing methane emissions]. Problemy ekolohiyi: zahal’noderzhavnyy naukovo-tekhnichnyy zhurnal, 1, 24-34 (In Russian)
5. Bulat, A. F. (1998). Sozdanie industrii shahtnogo metana v toplivno-jenergeticheskom komplekse Ukrainy [Creation of the coal mine methane industry in the fuel and energy complex of Ukraine]. Heotekhnichna mekhani- ka: Mizhvid. zb. nauk. prats IHTM NAN Ukrainy, 10, 3-8 (In Russian).
6. Bulat, A. F., Pilipenko, Yu. N., Novikov, L. A. (2016). Geomehanicheskoe sostojanie fljuidonasyshhennyh ugol’nyh plastov pri perehode ochistnymi rabotami zon razryvnyh dislokacij [Geomechanical state of fluid saturation coal seams in transition sewage works zon rupture dislocations]. Heotekhnichna mekhanika: Mizhvid. zb. nauk. prats IHTM NAN Ukrainy, 126, 3-14 (In Russian).
7. Bulat, A. F., & Pilipenko, Yu. N. (2013). Razrushenie fljuidonasyshhennogo geomateriala s narushennoj strukturoj pri szhatii [Destruction of the flyuid-saturated geomaterial with the broken structure at compres- sion]. Heotekhnichna mekhanika: Mizhvid. zb. nauk. prats IHTM NAN Ukrainy, 112, 3-22 (In Russian).
8. Eugeniusz, К, & Zbigniew, P. (2013). Investigations on Methane Emission from Flooded Workings of Closed Coal Mines. Journal of Sustainable Mining, 12(2), 40- 45. doi: 10.7424/jsm130206.
9. Gorobei, M. S., Yermakov, V. M., Lunova, О. V. (2020). Man-made pollution of the environment with coal dust as a result of operation and closure of coal mines. Journ. Geol. Geograph. Geoecology, 24(4), 693-700. doi: 10.15421/112062.
10. Iofis, M. A., & Shmelev, A. I. (1985). Inzhenernaja geome- hanika pri podzemnyh razrabotkah [Engineering geo- mechanics by the underground operations]. Nedra, Moscow (in Russian).
11. Kamarov, R. K., Zamaliyev, N. M., Akhmatnurov, D. R., Musin, R. A. (2017). Setting the volume and location of the gas collectors of abandoned coal mines. Nau- kovyi Visnyk Natsionalnoho Hirnychoho Univer- sytetu, 2, 5-11. doi: 10.29202/nvngu/2018-2/2.
12. Kholod, N., Evans, M., Pilcher, R. C., Roshchanka, V., Ruiz, F., Coté, M., Collings, R. (2020). Global methane emissions from coal mining to continue growin. Jour- nal of Cleaner Production, 256, 1-12. doi: 10.1016/j. jclepro.2020.120489.
13. Korchagina, T. V., Efimova, N. V., Zhabin, A. B., Ishuti- na, S. A. (2017). Issledovanie jemissii ugol’nogo metana na poverhnost’ iz likvidiruemyh shaht [Re- search of emission of coal methane to the surface from mines of liquidated]. Izvestija Tul’skogo gosudarst- vennogo universiteta. Nauki o Zemle, 4, 48-60. Re- trieved from https://tidings.tsu.tula.ru/tidings/index. php?id=earth&lang=ru&year=1 (In Russian).
14. Kuznecov, S. V., & Trofimov, V. A. (2005). Fil’tracija zhid- kosti i gaza v ugol’nom plaste pri dvizhushhejsja svo- bodnoj poverhnosti [Filtration of liquid and gas in a coal seam with a moving free surface]. Materials of the 15th International Scientific School named after academician S.A. Hristianovicha: “Deformation and destruction of materials with defects and the dynamic influences in rocks and workings”. Simferopol’, V. I. Vernadsky Tau- rida National University. 148-153 (In Russian).
15. Uziiuk, V. I., Byk, S. I., Ilchyshyn, A. V. (2001). Hazohen- eratsiynyy potentsial kam’yanovuhil’nykh baseyniv Ukrayiny [Gas generator potential of carboniferous ba- sins of Ukraine]. Heolohiya i heokhimiya horyuchykh kopalyn: naukovyy zhurnal, 2, 110-121 (In Ukrainian).
16. Volkov, M. G. (2017). Metodika rascheta techenija neft- evodogazovyh smesej v stvole vertikal’noj skvazhiny [Oil-water-gas flow calculations in vertical wells]. Problemy sbora, podgotovki i transporta nefti i neft- eproduktov, 3(109), 9-42. Retrieved from http://ntj-oil. ru/index (In Russian).
17. Zabigajlo, V. E., Lukinov, V. V., Pimonenko, L. I., Sahnevich, N. V. (1994). Tektonika i gorno-geologicheskie uslovija razrabotki ugol’nyh mestorozhdenij Donbassa [Tectonics and mining and geological conditions for the development of Donbass coal deposits]. Naukova Dumka, Kyiv (In Russian).
18. Zabigajlo, V. E., Lukinov, V. V., Shirokov, A. Z. (1983). Vybrosoopasnost’ gornyh porod Donbassa [Outburst hazard of Donbass rocks]. Naukova Dumka, Kyiv (In Russian).
19. Zabigajlo, V. E. (1989). Fiziko-himicheskie metody upravlenija sostojaniem ugol’no-porodnogo massiva [Phys- icochemical methods of management the state of the coal-rock massif]. Naukova Dumka, Kyiv (In Russian).
Published
2022-09-25
How to Cite
Mineev, S., Kurnosov, S., Makeiev, S., & Novikov, L. (2022). Geoenvironmental aspects of mine methane emissions. Journal of Geology, Geography and Geoecology, 31(3), 521-528. https://doi.org/https://doi.org/10.15421/112248