STUDY OF THE IMPACT OF EXPLOITATION STRUCTURES ON PRESSURE DISTRIBUTION AND ADSORBED METHANE CONTENT IN COAL SEAMS USING DYNAMIC FLOW MODELS. A CASE STUDY
 
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Oil and Gas Institute - National Research Institute. Krosno Branch
CORRESPONDING AUTHOR
Wiesław Szott   

Oil and Gas Institute - National Research Institute. Krosno Branch
 
Mining Science 2020;27:133–153
 
KEYWORDS
TOPICS
ABSTRACT
One of the most serious difficulties encountered during the estimation of results of various methods of methane drainage from coal seams is the determination of the initial condition prior to commencement of the actual process of methane drainage. It is well known that the exploitation operation in adjacent coal seams may significantly modify the original state of methane adsorption in that seam, as well as influence the distribution of pore pressure and saturation of its natural fractures with fluids (gas, water). This state is of dynamic nature and depends on a long and complex history of the mining activity in the analysed facility and its surrounding. Detailed specification of the above condition is usually replaced by qualitative and very approximate models, which does not allow for consideration of the process preceding the methane drainage. The subject of the paper is the quantitative evaluation of the initial conditions for a coal seam with the use of dedicated simulation models of the analysed seam along with its broad surroundings. Results of this modelling including modifications of appropriate transport parameters of layers between the seams and their influence on detailed distribution of pore pressures, levels of methane desorption from the coal matrix, directions of reservoir fluids flow and saturation with these fluids in natural fractures of the selected seam and in the pores of overburden and underburden rocks will be thoroughly analysed for determination of spacious and temporal effects of the mining activities in terms of their influence on the selected seam.
 
REFERENCES (22)
1.
Annual Report… 2002–2011 – Annual Report (for the years 2001–2010) on the State of Basic Natural and Technical Hazards in the Hard Coal Mining Industry, Gas Hazard. Publ. Central Mining Institute, Katowice 2002–2011, p. 20–40.
 
2.
BEAR J., 1972, Dynamics of fluids in porous media, Dover Publications.
 
3.
Eclipse 300, 2017, GeoQuest, Schlumberger, https://www.software.slb.com/p..., [accessed: 15 May 2017].
 
4.
Economic Commission for Europe, 2010. Methane to Markets Partnership. Best Practice Guidance for Effective Methane Drainage and Use in Coal Mines, ECE Energy Series No. 31, United Nations, New York and Geneva.
 
5.
FOURNEY W.L., BARKER D.B., HOLLOWAY D.C., 1981, Model studies of explosive well stimulation techniques, International Journal of Rock Mechanics and Mining Sciences and Geomechanics Ab-stracts, Vol. 18, Iss. 2, pp. 113–127, ISSN 0148-9062,.
 
6.
GasDrain – Development of Improved Methane Drainage Technologies by Stimulating Coal Seams for Major Risks Prevention and Increased Coal Output), 2018, Project funded by the European Commis-sion Research Programme of the Research Fund for Coal and Steel under grant agreement No. RFCR-CT-2014-00004, Consortium led by Central Mining Institute, Katowice, Poland, 01.07.2014–31.12.2018.
 
7.
Global methane and the coal industry, 1994, Coal Industry Advisory Board, International Energy Agency, Paris.
 
8.
KABIESZ J., MAKÓWKA J., 2009, Empirical-analytical method for evaluating the pressure distribution in the hard coal seams, Mining Science and Technology, 19, pp. 556–562.
 
9.
KARACAN C.Ö., DIAMOND W.P., SCHATZEL S.J., 2007, Numerical analysis of the influence of in-seam horizontal methane drainage boreholes on longwall face emission rates, International Journal of Coal Geology, 72, 15–32.
 
10.
KĘDZIOR S., 2015, Methane contents and coal-rank variability in the Upper Silesian Coal Basin, Poland, International Journal of Coal Geology, 139, 152–164.
 
11.
KRAUSE E., WIERZBIŃSKI K., SIMKA A., 2005, Intensity of gas desorption from the coal as indicator of methane and rock outburst hazard, Quarterly “Mine rescue”, No. 3 (39).
 
12.
KROOSS B., LEŚNIAK G., AMANN-HILDENBRAND A., ZIEGER L., ZIEMIANIN K., 2016, RWTH Aachen University, unpublished Deliverable No. 1.1 Characterisation of Coal Seams and Surrounding Rocks: Field Site Characterisation, Project: Development of Improved Methane Drainage Technologies by Stimulating Coal Seams for Major Risks Prevention and Increased Coal Output (GasDRAIN) funded by the European Commission Research Fund for Coal and Steel (RFCS), Grant No: RFCR-CT-2015-00005).
 
13.
LIN B., SHEN C., 2015, Coal permeability-improving mechanism of multilevel slotting by water jet and application in coal mine gas extraction, Environ Earth Sci., 73, 5975–5986.
 
14.
LOGAN T.L. et al., 1993, Optimizing and Evaluation of Open Hole Cavity Completion Techniques for Coal Gas Wells, Proceedings of the 1993 International Coalbed Methane Symposium, The University of Alabama/Tuscaloosa, 9346.
 
15.
MOORE TA., 2012, Coalbed methane: A review, International Journal of Coal Geology, 101, 36–81.
 
16.
Package: Eclipse 100, 300, Release 2014.1, Petrel Release 2014.1. GeoQuest Schlumberger.
 
17.
SHEN C. et al., 2015, Analysis of the stress–permeability coupling property in water jet slotting coal and its impact on methane drainage, Journal of Petroleum Science and Engineering, 126, 231–241.
 
18.
SHI J., DURUCAN S., A model for changes in coalbed permeability during primary and enhanced me-thane recovery, SPE Reservoir Evaluation and Engineering, 2005, 8, 291–299.
 
19.
SZOTT W. et al., 2018, Numerical Studies of Improved Methane Drainage Technologies by Stimulating Coal Seams in Multi-Seam Mining Layouts: A Case Study, International Journal of Rock Mechanics and Mining Sciences, accepted for publication.
 
20.
SZLĄZAK N. et al., 2016, Methane in Polish Coal Mines – Methods of Control and Utilization, Confer-ence: 24th World Mining Congress, Rio de Janeiro.
 
21.
Visage, GeoQuest, Schlumberger, https://www.software.slb.com/p..., 2017, [accessed: 15 May 2017.
 
22.
YAN F. et al., 2015, A novel ECBM extraction technology based on the integration of hydraulic slotting and hydraulic fracturing, Journal of Natural Gas Science and Engineering, 22, 571–579.
 
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