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Energy approach to analysys of the fluid pulse injection into a coal bed

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Category: Mining

Last Updated on 24 July 2014

Published on 10 July 2013

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Authors:

Yu.A. Zhulay, Cand. Sci. (Tech.), Senior Research Fellow, Institute of Transport Systems and Technologies of National Academy of Sciences of Ukraine, Leading Researcher, Dnepropetrovsk, Ukraine

A.A. Angelovskiy, Institute of Geotechnical Mechanics of National Academy of Sciences of Ukraine, postgraduate student, Public Joint-Stock Company “Krasnodonugol” General Manager, Krasnodon, Ukraine

Abstract:

One of the effective methods of controlling the spontaneous outbursts of coal and gas and explosions of methane in mines is the fluid pulse injection into coal beds. Of late years the significant results in this field have been received by Institute of Geotechnical Mechanics of National Academy of Sciences of Ukraine together with PAO “Krasnodonugol”. They developed the method and the device for hydro pulse action on coal layers using the cavitation generator of fluid pressure elastic vibrations. The results of mining experimental work aimed at the evaluation of the efficiency of the submersible cavitation generator application in the flowchart of hydro loosening have shown that the device provides the effective hydro loosening and degassing of outburst-prone coal layers with low hydraulic permeability in ground pressure zones when driving a development working with mining combines.

Purpose. To carry out the energy estimation of advantages of the hydro loosening of a coal layer by the pulse action and compare it with static fluid injection.

Methodology. The research was based on theoretical study of density of an energy flow running through a surface per a time unit taking into account the experimentally obtained dependence of the fluid pressure pulse value on the value of backup in the borehole.

Findings. The calculated dependencies of energy flow on backup pressure, at both pulse and static fluid injection pressure of 20.1 MPa are presented.

Originality. For the first time we have established that the energy flow during the hydro pulse action on a coal layer (other conditions being equal) 1.8 times exceeds the value of energy flow during hydro loosening by static fluid injection.

Practical value. The analysis of the presented dependences confirms the possibility of improvement of efficiency of hydro loosening of outburst-prone coal layers and control of gas-dynamic factors in mines through hydro pulse action when running the in-seem development working.

References:

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SOU 10.1.001740088-2005. Pravila vedennia girnychykh robit na plastakh skhylnykh do gazodynamichnykh yavysch [Rules of Mining on Layers Prone to Gas-Dynamic Phenomena]. Introduced on December 30, 2005, Minugleprom Ukrainy, Kyiv, Ukraine.

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Boyko, Ya.I., Nikiforov, A.V. and Rubinskyi, A.A. (2009), “Increase of efficiency of hydro loosening of outburst prone coal layers in development working and in niches”, Sposoby i sredstva sozdaniya bezopasnykh usloviy truda v shakhtakh: sbornyk nauchnykh trudov MakNII, no.2 (24), pp. 143–147.

3. Моисеенко П.Ю. Обоснование параметров кавитационного генератора для гидрорыхления угольных пластов: автореф. дис. на здобуття наук. ступеня канд. техн. наук: 05.05.06 / П.Ю. Моисеенко – Днепропетровск, 2010. – 25 с.

Moiseenko, P.Yu. (2010), Obosnovaniye parametrov kavitatsyonnogo generatora dlya rykhleniya ugolnykh plastov [Substanitation of Parameters of Cavitation Generator for Hydro Loosening of Coal Layers], Abstract of the Dissertation of Cand. Sci. (Tech.), Dnepropetrovsk, Ukraine.

4. Пат. 87038 Україна, МПК Е21F 5/02 . Пристрій для гідроімпульсного впливу на вугільний пласт / Л.М. Васильєв, Ю.О. Жулай, В.В. Зберовський,  П.Ю. Моісеєнко, М.Я. Трохимец; заявник і патентовласник ІГТМ НАН України. – № а 200710209/9822; заявл. 13.09.07; опубл. 10.06.09, Бюл. № 11.

Vasilyev, L.M., Zhulay, Yu.A., Zberovsky, V.V., Moiseenko, P.Ya. and Trokhimets N.Ya. (2009), Ustroystvo dlya hidroimpulsnogo vozdeystviya na ugolny plast [Device for Hydro Pulse Action on Coal Layer] Patent 87038 Ukraine, MKY Е21F 5/02, declarant and patent holder: Institute of Geotechnical Mechanics of National Academy of Science of Ukraine, declaration date September 13, 2007, published on June 6, 2009, Bulleting no.11.

5. Жулай Ю.А. Сравнительная оценка энергии удара пульсирующей и стационарной струй/ Ю.А. Жулай, А.С. Ворошилов // Зб. наук. пр. НГУ України. – Дніпропетровськ, 2010. – № 34. – Т. 2. – С. 183–190.

Zhulay, Yu.A. and Voroshilov, A.S. (2010), “Comparative estimation of blow energy of pulsing and stationary streams”, Zbirnyk naukovykh prats NGU Ukrainy, vol. 2, no. 34, pp. 183–190.

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