Krukovskyi O., Minieiev S., Krukovska V., Yanzhula O. Analysis of the influence of initial coal seam permeability on the hydraulic extrusion process

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Parent Category: Geo-Technical Mechanics, 2024
Category: Geo-Technical Mechanics, 2024, Issue 170

Geoteh. meh. 2024, 170, 133-143

 

ANALYSIS OF THE INFLUENCE OF INITIAL COAL SEAM PERMEABILITY ON THEHYDRAULIC EXTRUSION PROCESS

1Krukovskyi O., 1Minieiev S.,1Krukovska  V., 2Yanzhula O.

1M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine

2Coal Directorate METINVEST HOLDING LLC

UDC 622.831.325

Language: English

Abstract. One of the methods for preventing coal and gas outbursts is hydraulic extrusion of the near-face part of a coal seam. Hydraulic extrusion is performed by high-pressure water injection into the coal seam through wells in faces of stopes and temporary roadways. This method differs from others in its high injection pressure and rate, as well as the short length of the filtering part of wells, which ensures the coal seam displacement into the roadway, coal unloading and degassing. But its effectiveness depends on a number of factors, including the natural coal seam permeability. In this regard, the purpose of this work is to analyse the influence of the natural, initial coal seam permeability on the course of the hydraulic extrusion process and its effectiveness. To achieve the goal, numerical simulation of time-dependent coupled processes of elastic-plastic rock deformation and liquid and gas filtration was performed, and distributions of geomechanical and filtration parameters in the near-face zone of a coal seam during hydraulic extrusion were obtained at different values of initial permeability.

The graphs of the time change of average permeability in the near-face zone of the coal seam show that its increase before the start of injection is caused by the roadway construction and the growth of the filtration area around it. When injection begins, a sharp increase in average permeability occurs due to the spread of the permeable area around the filtering parts of the wells. The average permeability increases for the second time at the end of the injection process, when the highly permeable areas around the filtering parts of the wells and at the roadway face are connected, after which water comes to the free coal surface. As it follows from the analysis of water pressure distributions in the fractured porous space of coal, lower natural permeability leads to a decrease in the area of increased water pressure around the filtering part of the wells; an increase in water pressure in this area; an increase in water pressure gradients, which affects its ability to expand cracks and promote their growth, as well as the dynamics of the hydraulic extrusion process. The efforts should help in selecting potential measures to prevent coal and gas outbursts depending on the initial coal seam permeability, as well as in assessing the technological parameters of hydraulic extrusion.

Keywords: coal and gas outburst, coal seam hydraulic extrusion, coupled processes, permeability, numerical simulation.

 

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About the authors:

Krukovskyi Oleksandr, Corresponding Member of NAS of Ukraine, Doctor of Technical Sciences (D.Sc), Deputy Director of the Institute, M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine (IGTM of the NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. , ORCID 0000-0002-2659-5095

Мinieiev Serhii, Doctor of Technical Sciences (D.Sc.), Professor, Head of Department of Pressure Dynamics Control in Rocks, M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine (IGTM of the NAS of Ukraine), Dnipro, Ukraine,   This email address is being protected from spambots. You need JavaScript enabled to view it. , ORCID 0000-0002-4594-0915

Krukovska Viktoriia, Doctor of Technical Sciences (D.Sc), Senior Researcher, Senior Researcher in Department of Dynamic Manifestations Control of Rock Pressure, M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine (IGTM of the NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. , ORCID 0000-0002-7817-4022

YanzhulaOleksii, Candidate of Technical Sciences (Ph.D.), Director for Technical Development and Investments, Coal Directorate METINVEST HOLDING LLC, Pokrovsk, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. , ORCID 0009-0000-8906-0656