Comprehensive gas drainage technology by hydraulic splitting of coal seam using surface holes

The mechanism of efficient in-situ drainage based on an integrated approach and hydrodynamic treatment of a coal seam by means of its hydraulic splitting using holes drilled from the surface and from underground excavations is disclosed. The integrated drainage is aimed to ensure uniform and highly efficient in-situ degassing. The mechanism of efficient integrated in-situ drainage is justified. Reduction in gas content at coal face and decrease in methane emission from coal seam under mining is ensured by high-rate methane drainage using in-seam degassing holes in the zones of hydraulic fracturing and hydraulic splitting, as well as increased residual gas content of coal seam in the zone of hydraulic treatment owing to blocking of methane by water in the infinitesimal pores and fissures in coal seam. Deepening of degassing also occurs as a consequence of methane substitution by water in the absorptive volume of the coal seam under mining. The information on gas drainage phase I implementation in Boldyrevsky coal seam using holes drilled from surface is given. The flow chart of primary exploration in the field of the Kirov Mine is presented. The differences between the test technology and conventional approach described in the main regulations on coal mine degasification are described.

Slastunov S. V., Mazanik E. V., Sadov A. P., Khautiev A. M.-B. Comprehensive gas drainage technology by hydraulic splitting of coal seam using surface holes. MIAB. Mining Inf. Anal. Bull. 2020;(1):5-14. [In Russ]. DOI: 10.25018/0236-1493-2020-1-0-5-14.

S.V. Slastunov, Dr. Sci. (Eng.), Professor, Mining Institute,
National University of Science and Technology «MISiS»,
119049, Moscow, Russia, e-mail: slastunovsv@mail.ru,
E.V. Mazanik¹, Cand. Sci. (Eng.),
Director of the Aerological Safety of Underground Mining,
e-mail: mazanikev@suek.ru,
A.P. Sadov¹, Cand. Sci. (Eng.),
Director of the Office of Degassing and Methane Utilization,
e-mail: Sadovap@suek.ru,
A.M.-B. Khautiev¹, Cand. Sci. (Eng.), Process Engineer,
e-mail: khautievam@suek.ru,
¹ Joint-stock company «SUEK-Kuzbass»,
Leninsk-Kuznetsky, Russia.

S.V. Slastunov, e-mail: slastunovsv@mail.ru

1. Hu C., Wu D. A novel gas drainage technology for lower protected coal seams: Application and verification in Xinzhuangzi coal mine, Huainan coalfield. IPPTA: Quarterly Journal of Indian Pulp and Paper Technical Association, 2018, vol. 30(7), pp. 801—808.
2. Zhang L., Zhang H., Guo H. A case study of gas drainage to low permeability coal seam. International Journal of Mining Science and Technology, 2017, vol. 27(4), pp. 687—692. DOI: 10.1016/j.ijmst.2017.05.014.
3. Zhao Z. M., Wang G. The research of gas drainage technology in daning coal mine. Applied Mechanics and Materials. 2014, vol. 580—583, pp. 2558—2563 DOI: 10.4028/www.scientific. net/AMM.580-583.2558.
4. Szott W., Słota-Valim M., Gołąbek A., Sowiżdżał K. Numerical studies of improved methane drainage technologies by stimulating coal seams in multi-seam mining layouts. International Journal of Rock Mechanics and Mining Sciences, 2018, vol. 108, pp. 157—168. DOI: 10.1016/j. ijrmms.2018.06.
5. Kurlenya M. V., Serdyukov S. V., Shilova T. V., Patutin A. V. Procedure and equipment for sealing coal bed methane drainage holes by barrier shielding. Journal of Mining Science. 2014, vol. 50(5), pp. 994—1000. DOI: 10.1134/S1062739114050196011.
6. Slastunov S. V., Yutyaev E. P., Mazanik E. V., Sadov A. P., Ponizov A. V. Mine testing improved technology underground reservoir degassing with the use of hydraulic fracturing. Ugol'. 2016, no 11, pp. 32—37. [In Russ].
7. Slastunov S. V., Yutyaev E. P., Mazanik E. V., Ermak G. P. Study of the effectiveness of enhanced technology of underground hydraulic fracturing of a coal seam for the decontamination. Gornyy zhurnal. 2018, no 1, pp. 83—87. [In Russ].
8. Slastunov S. V., Yutyaev E. P. Reasonable choice of technology for reservoir degassing to ensure the safety of underground mining-intensive coal mining. Zapiski gornogo instituta. 2017. Vol. 223, pp. 125—130. [In Russ].
9. Yutyaev E. P., Sadov A. P., Meshkov A. A., Khautiev A. M., Taylakov O. V., Utkaev E. A.Evaluation of filtration properties of coal in hydrodynamic testing of reservoir degassing wells. Ugol'. 2017, no 11, pp. 24—29. [In Russ].
10. Nozhkin N. V. Zablagovremennaya degazatsiya ugol'nykh mestorozhdeniy [Advance degassing of coal deposits], Moscow, Nedra, 1979, 271 p.
11. Vremennoe rukovodstvo po zablagovremennoy podgotovke shakhtnykh poley k effektivnoy razrabotke skvazhinami s poverkhnosti s pnevmogidrovozdeystviem na svitu ugol'nykh plastov [Interim guidance for pre-preparation of the mining fields to the effective development of wells with the surface pneumohydrodrives the retinue of coal seams], Moscow, MGI, 1991, 92 p.
12. Instruktsiya po degazatsii ugol'nykh shakht. Rostekhnadzor RF [Manual for the degassing of coal mines. The Rostechnadzor of the Russian Federation], 2013. [In Russ].
13. Malyshev Yu. N., Ayruni A. T., Zverev I. V. High-performance degassing metronomic coal seams at big depths. Gornyy informatsionno-analiticheskiy byulleten’. 1997, no 6, pp. 78—87. [In Russ].