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ArticleName Modeling permeability variation in coal seams during active desorption of methane and flow of formation fluid
DOI 10.17580/gzh.2019.10.13
ArticleAuthor Cherepanskiy M. M., Shishlyaev V. V.

Sergo Ordzhonikidze Russian State Geological Prospecting University, Moscow, Russia:

M. M. Cherepanskiy, Head of Chair, Doctor of Geologo-Mineralogical Sciences,


Moscow Division, Gazprom Project Engineering, Moscow, Russia:
V. V. Shishlyaev, Head of Department


In the recent two decades, the methane-bearing coal mines worldwide increasingly often raise a point on the change in the stress state of coal seams during recovery of formation fluids, as well as on the influence of field-geological factors on productivity of holes drilled in methane-bearing coal. Permeability is one of the most variable characteristics of coal seams. Its variation with area, due to rock pressure, deformation characteristics of coal, metamorphic grade and faulting, is an extremely complex pattern which conditions different behavior of drainage zones around a hole. The variation in permeability of coal seams in the course of drilling and operation of methane drainage holes is one of the scantly understood physical processes and, is, thus, of higher concern. This article describes physical models including phenomena of coal matrix shrinkage as well as influence exerted by change in the effective stress on the process of gas recovery from coal during active methane desorption and flow of the formation fluid. The modeling results show that in geological conditions of the Naryk-Ostashkin methane-bearing coal field, methane diffusion has the highest effect on the coal permeability by increasing it. Implementation of mathematical models of change in coal permeability during active processes of methane desorption and fluid flow requires additional information of physical and mechanical properties of coal seams, which needs undertaking full-waveform wide-band acoustic logging using cross-dipole sources.

keywords Methane-bearing coal field, coal seam, permeability, matrix shrinkage, formation fluid flow, modeling

1. Kirilchenko A. V., Khryukin V. T., Shvachko E. V. Methodological approaches to methane appraisal in coal seams as unconventional reservoirs. Nedropolzovanie-XXI vek. 2015. No. 2(52). pp. 92–95.
2. Panina L. V., Zaytsev V. A., Mikhaylov V. O. The neotectonics and geodynamic development of the Naryk-Ostashkin Area (South Kuznetsk Basin). Moscow University Geology Bulletin. 2015. Vol. 70, No. 1. pp. 18–23.
3. Vasilev A. N., Shishlyaev V. V., Kirilchenko A. V. Implantation of percussion-rotary drilling technology and effective methods of geological field research in exploration coalbed methane fields. Razvedka i okhrana nedr. 2014. No. 7. pp. 45–49.
4. Sharipov B. I., Sizikov D. A., Shishlyaev V. V., Kuznetsov R. V. Applicability of different systems of mining methane-bearing coal seams in terms of geological conditions of the Naryk–Ostashkin field. Nauka i tekhnika v gazovoy promyshlennosti. 2016. No. 4(68). pp. 3–9.
5. Storonskiy A. N. Poro-permeability of coal seams. Gazovaya promyshlennost. 2012. Special issue No. 1(672). pp. 25–27.
6. Lei Yang. A Mixed Element Method for the Desorption-Diffusion-Seepage Model of Gas Flow in Deformable Coalbed Methane Reservoirs. Mathematical Problems in Engineering. 2014. Vol. 2014.
7. Baisheng Nie, Xianfeng Liu, Shaofei Yuan, Boqing Ge, Wenjie Jia, Chunliang Wang, Xihui Chen. Sorption charateristics of methane among various rank coals: impact of moisture. Adsorption. 2016. Vol. 22, Iss. 3. pp. 315–325.
8. Haijun Guo, Yuanping Cheng, Liang Wang, Shouqing Lu, Kan Jin. Experimental study on the effect of moisture on low-rank coal adsorption characteristics. Journal of Natural Gas Science and Engineering. 2015. Vol. 24. pp. 245–251.
9. Ruimin Feng, Harplani S., Pandey R. Laboratory measurement of stress-dependent coal permeability using pulse-decay technique and flow modeling with gas depletion. Fuel. 2016. Vol. 177. pp. 76–86.
10. Seidle J. P., Huitt L. G. Experimental Measurement of Coal Matrix Shrinkage Due to Gas Desorption and Implications for Cleat Permeability Increases. International Meeting on Petroleum Engineering. Beijing, 1995.
11. Palmer I., Mansoori J. How Permeability Depends on Stress and Pore Pressure in Coalbeds: A New Model. SPE Annual Technical Conference and Exhibition. Denver, 1996. pp. 539–544.
12. Khaydina M. P. Unconventional resources of hydrocarbons. Methane-bearing coal deposits: Teaching aid. Moscow : RGU nefti i gaza im. I. M. Gubkina, 2015. 101 p.
13. Thakur P. Advanced Reservoir and Production Engineering for Coal Bed Methane. Cambridge : Gulf Professional Publishing, 2017. 224 p.
14. Shi J. Q., Duracan S. Drawdown Induced Changes in Permeability of Coalbeds: A New Interpretation of the Reservoir Response to Primary Recovery. Transport in Porous Media. 2004. Vol. 56, Iss. 1. pp. 1–16.
15. Ji-Quan Shi, Sevket Durucan. Modelling laboratory horizontal stress and coal permeability data using S&D permeability model. International Journal of Coal Geology. 2014. Vol. 131. pp. 172–176.

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