Low-permeable gas-bearing and outburst-hazardous coal seam mining in the Karaganda Coal Basin

The layers of the Karaganda coal basin have a high gas content and low permeability. In addition, coal seams are dangerous due to sudden emissions of coal and gas. In article there are a brief overview of the parameters of mining operations and the choice of preparation methods is presented. Attention is focused on current and possible future practices in the Karaganda basin. Traditional methods of mining (and overworking) of a coal seam and achieving a higher level of permeability due to unloading of the massif are not always feasibility due to mining and geological conditions. Emissions from sinking, especially through the d6 seam, are still a big problem. New technologies for preventing emissions and predicting geological anomalies are being tested. The management of gas emission during cleaning operations also requires the integration of special methods. The results of improving the quality of sealing the wellhead of pre-degassing wells are presented in this article. Improving the quality of sealing has provided a significant increase in the concentration of methane and allows it to be used for generating electricity. The article considers the applied and prospective methods for ensuring effective control of gas release and extraction of conditioned methane.

Baymukhametov S. K., Imashev A. Zh., Mullagaliev F. A., Mullagalieva L. F., Kolikov K. S. Low-permeable gas-bearing and outburst-hazardous coal seam mining in the Karaganda Coal Basin. MIAB. Mining Inf. Anal. Bull. 2021;(10-1):124—136. [In Russ]. DOI: 10.250 18/0236_1493_2021_101_0_124.

Baymukhametov S. K.¹, Dr. Sci. (Eng.), Professor, Vice-President of the expert group on coal mine Methane of the United Nations Economic Commission for Europe (Karaganda);
Imashev A. Zh.¹, Doctor Of Ph.D, Head of the department “Development of mineral deposits”;
Mullagaliev F. A.¹, Cand. Sci. (Eng.), Senior Lecturer;
Mullagalieva L. F.¹, doctoral student;
Kolikov K. S.², Dr. Sci. (Eng.), Associate Professor, Head of the Department of Safety and Ecology of Mining Production;
¹ Karaganda Technical University, Karaganda, Kazakhstan;
² Mining Institute NUST “MISiS”, Moscow, Russia.

1. Balovcev S. V. Comparative assessment of aerological risks at operating coal mines. MIAB. Mining Inf. Anal. Bull. 2021. no. 2—1. pp. 5—17. DOI: 10.25018/0236—1493— 2021—21—0-5—17. [In Russ]

2. Kulikova E. Yu. Monitoring-the basis for reducing the georisk during the development of underground space. Markshejderskij vestnik. 2019. no. 1 (128). pp. 57—64. [In Russ]

3. Kaledina N. O., Koroleva V. N. On changing the approach to assessing the methane hazard of gas mines. Ugol’. 2016. no. 12 (1089). pp. 56—58. [In Russ]

4. Slastunov S. V., Yutyaev E. P., Mazanik E. V., Ermak G. P. Efficiency of improved underground hydraulic fracturing in coal bed degassing. Gornyj zhurnal. 2018. (1). pp. 83—87. [In Russ]

5. Bajmuhametov S. Problemy bezopasnoj dobychi uglya s plastov s vysokim soderzhaniem gaza [Problems of safe coal mining from reservoirs with a high gas content]. Karaganda, 2006. 205 p. [In Russ]

6. Gray Ian Dr. Through the drill string or core bit DST system. Australia. 2011261172. 2013.

7. Muhamedzhanov D. i dr. Tekhnologii Ventilyacii i izvlecheniya gaza iz plastov s vysokim soderzhaniem gaza v Kazahstane [Technologies of ventilation and gas extraction from reservoirs with a high gas content in Kazakhstan]. Konferenciya Rukovoditelej Gornodobyvayushchih predpriyatij, Astana, 2009. [In Russ]

8. Patent RK no. 2002/0918.1. Bajmuhametov S. K., Polchin A. I. i dr. [In Russ]

9. Baisheng Nie, Xianfeng Liu, Shaofei Yuan, Boqing Ge, Wenjie Jia et al. Sorption charachteristics of methane among various rank coals: impact of moisture. Adsorption. 2016. Vol. 22. no. 3. pp. 315—325.

10. Yili Kang, Fansheng Huang, Lijun You, Xiangchen Li, Bo Gao. Impact of fracturing fluid on multi-scale mass transport in coalbed methane reservoirs. International Journal of Coal Geology. 2016. Vol. 154—155. pp. 123—135.

11. Pinkun Guo, Yuanping Cheng. Permeability prediction in deep coal seam: A case study on the no. 3 coal seam of the Southern Qinshui Basin in China, The Scientific World Journal, 2013, Vol. 2013, 10 p.

12. Batugin A. A proposed classification of the earth’s crustal areas by the level of geodynamic threat. Geodesy and Geodynamics, 2021. no. 12(1), pp. 21—30. doi:10.1016/j. geog.2020.10.002.

13. Mazina I. E., Mullagalieva L. F., Stel’mahov A. A. Modeling of the stress-strain state of the treatment face with the technology of roof control by complete collapse and laying of the worked-out space. MIAB. Mining Inf. Anal. Bull. 2020. no. 6—1. pp. 99—106. [In Russ]

14. Ul’yanova E. V., Malinnikova O. N., Pashichev B. N., Malinnikova E. V. Microstructure of fossil coals before and after gas-dynamic phenomena. Fiziko-tekhnicheskie problemy razrabotki poleznyh iskopaemyh. 2019. no. 5. pp. 10—17. [In Russ]

15. Malashkina V. A. Monitoring the effectiveness of the coal mine degassing system-the basis for safe work of miners. MIAB. Mining Inf. Anal. Bull. no. 6—1. 2020. pp. 38—45. DOI: 10.25018/0236—1493—2020—61—0-38—45 [In Russ]