Sofiyskyi K.K., Prytula D.O., Stasevych R.K., Ahaiev R.A., Smirnov O.P. Principal possibility of using wave method of intensification of methane inflow through surface degassing boreholes

Details
Parent Category: Geo-Technical Mechanics, 2020
Category: Geo-Technical Mechanics, 2020, № 150

Geoteh. meh. 2020, 150, 98-105

https://doi.org/10.15407/geotm2020.150.098

 

PRINCIPAL POSSIBILITY OF USING WAVE METHOD OF INTENSIFICATION OF METHANE INFLOW THROUGH SURFACE DEGASSING BOREHOLES

1Sofiіskyi K.K., 1Prytula D.O., 1Stasevych R.K., 1Ahaiev R.A., 2Smirnov O.P.

1 Institute of Geotechnical Mechanics named by N. Poliakov of National Academy of Sciences of Ukraine, 2Institute of Pulse Processe and Technologies of National Academy of Sciences of Ukraine

UDC 622.831.325.3:622.279.6:530.61

Language: Russian

Annotation.

The authors consider the relevance of alternative energy sources and their development in modern conditions. Coal gas methane is one of the most promising sources of energy. It is found in coal seams and gas-bearing sandstones. The reserves of these minerals in Ukraine are estimated at between 4 - 12 trillion m3. This exceeds natural gas reserves by 2.0 - 2.5 times. However, the known methods of methane production do not allow to effectively and safely extract it from the depths of the Earth. According to the analysis of existing methods of intensification of methane inflow and restoration of the flow rate of surface degassing borehole, two methods are noted: pneumatic-hydrodynamic and electro-discharge. The main advantages of these methods are high efficiency, low energy consumption and environmental friendliness. The essence of the pneumatic-hydrodynamic method is to create excess pressure in the borehole-reservoir system and its abrupt discharge. This process is realized through degassing boreholes, which are drilled from the surface. The mechanism of such stimulation is aimed at: creation of alternating loads on the gas-saturated hydrocarbon massif; and decolmatation of the borehole zone due to its filtration properties. This process is cyclical and is repeated till meeting the criterion of treatment efficiency - methane consumption in economically justified volumes.  The essence of the electro-discharge method lies in the fact that in the surface degassing borehole, filled with liquid, an electric discharge is carried out. This leads to cyclic compression waves, pulsating steam-gas cavity and powerful electromagnetic fields. These fields act on the colmatant of the borehole zone. This method allows selectively affecting the productive gas-saturated hydrocarbon massif. These methods have proved to be effectively substantiated in terms of extraction of methane from coal deposits, oil production and purification of artesian borehole. The purpose of the research was to prove a possibility of using these methods as a complex extraction of methane from coal deposits and restoration of the flow rate of surface degassing borehole. The peculiarity of the complex method is that during the pneumatic hydrodynamic action in the filtration mode the water penetrates deeper into the gas-saturated hydrocarbon massif, and, thereby, leads to changing elastic properties of the massif and contributes to better propagation of the wave action caused by the electro-discharge method.

Keywords:

intensification of methane inflow, pneumohydrodynamic method, electro-discharge method, decolmation.

References

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About the authors

Sofiіskyi Kostiantyn Kostiantynovych, Doctor of Technical Sciences (D.Sc.), Professor, Head of the Department of Undeground Coal Mining Technology (IGTM NAS of Ukraine), Institute of Geotechnical Mechanics named by N. Poliakov of National Academy of Sciences of Ukraine (IGTM NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .

Prytula Dmytro Oleksandrovych, doctoral student, engineer of the 1st category in Department of Underground Coal Mining, Institute of Geotechnical Mechanics named by N. Poliakov of National Academy of Sciences of Ukraine (IGTM NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .

Stasevych Rishard Kazymyrovych, Doctorof of Technical Sciences (D.Sc.), Senior Researcher, Senior Researcher of the Department of Undeground Coal Mining Technology, Institute of Geotechnical Mechanics named by N. Poliakov of National Academy of Sciences of Ukraine (IGTM NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .

Ahaiev Ruslan Agaguluiyevych, Candidate of Technical Sciences (Ph.D), Senior Researcher of the Department of Underground Coal Mining Technology, Institute of Geotechnical Mechanics named by N. Poliakov of National Academy of Sciences of Ukraine (IGTM NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .

Smirnov Oleksіі Petrovych, Candidate of Technical Sciences (Ph.D), Senior Researcher in the Department of Pulse  processes  of  energy  conversion  and  methods  and  technologies  for  processing  of  non-metallic  materials, Institute of Pulse Processes and Technologies under the National Academy of Science of Ukraine (IPPT NAS of Ukraine), Mykolaiv, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .