Journals →  Gornyi Zhurnal →  2024 →  #1 →  Back

ArticleName Modeling hydraulic splitting of coal seam
DOI 10.17580/gzh.2024.01.09
ArticleAuthor Grechishkin P. V.

VNIMI’s Division in Kemerovo, Kemerovo, Russia

P. V. Grechishkin, Director, Candidate of Engineering Sciences,


In hydraulic splitting of coal seams, it is important to recognize the influence exerted by particular geological and geotechnical factors on the morphology and size of widened fractures. The study of the fracture morphology in hydraulic splitting of samples manufactured from a natural material was carried out. In the study, the condition of similarity rather than equality of deformations in model and in nature was fulfilled. For that reason, it was proposed to study the mechanism of fracture widening using equivalent materials and the main theoretical provision of oil reservoir mechanics. Modeling on artificial materials provides a functional dependence of the extension, propagation rate and opening of fractures created by hydraulic splitting. The possible natural morphology of fractures created in in-situ hydraulic splitting is not modeled in this case as a model is incapable to reproduce the structure and texture of a coal seam which is a nonuniform and anisotropic body. The combination of two types of modeling enables transference of lab-scale data to natural conditions and allows engineering analysis with regard to field observations. The implemented modeling of opening of hydraulic split fractures makes it possible to draw a conclusion that creation of fractures of substantial length (100–200 m) and width requires increasing flow rates of water used as breaking fluid, or using fluids of increased viscosity. For reaching comparable fracture parameters, the rate of water injection is to be 3–4 times higher than in case of injection of viscous fluids.

keywords Coal seam, fracture, hydraulic splitting, injection rate, fluid, viscosity, water flow rate

1. Nozhkin N. V. Experience of pre-mine drainage using direction hydraulic splitting. Moscow : Nedra, 1967. 104 p.
2. Voskoboev F. N., Dzhigrin A. V., Klishin V. I., Kachurin N. M., Melnik V. V. et al. Process designs of active control over geomechanical processes in coal mines. Tula : Izdatelstvo TulGU, 2015. 458 p.
З. Nozhkin N. V., Yarunin S. A., Dubina V. M., Tetentev B. D. Hydraulic split modeling : Conditions and experimental plant. Safety Engineering, Labor Protection and Mine Rescue : Digest. Moscow : TsNIEIugol, 1970. No. 6.
4. Chernyak I. L., Yarunin S. A. Rock mass control. Moscow : Nedra, 1995. 395 p.
5. Klishin V. I., Tailakov O. V., Opruk G. Yu., Utkaev E. A., Klishin S. V. Methods of hydraulic fracturing of poorly caving roof and coal seams to eliminate dynamic phenomena in coal mines. Gornaya promyshlennost. 2022. No. 6. pp. 46–53.
6. Taylakov O. V., Utkaev E. A., Smyslov A. I. Monitoring parameters of hydrodynamic impact on coal seams in mines. Nauka i tekhnika v gazovoy promyshlennosti. 2018. No. 1. pp. 88–90.
7. Mullagaliyeva L., Baimukhametov S., Portnov V., Yurov V. Simple model of hydraulic facing of coal bedroom. The Scientific Heritage. 2022. No. 82-2. pp. 65–67.
8. Slepyan L. I. Механика трещин. Leningrad : Sudostroenie, 1981. 295 p.
9. Slastunov S. V., Mazanik E. V., Meshkov A. A., Komissarov I. A. Breakdown fluid injection modes in underground hydraulic fracturing. GIAB. 2018. No. 10. pp. 110–117.
10. Chaojun Fan, Sheng Li, Mingkun Luo, Zhenhua Yang, Tianwei Lan. Numerical simulation of hydraulic fracturing in coal seam for enhancing underground gas drainage. Energy Exploration & Exploitation. 2019. Vol. 37, No. 1. pp. 166–193.
11. Junhui Fu, Guangcai Wen, Lin Fujin, Sun Haitao, Rifu Li et al. Coal mine hydraulic fracturing underground drainage research and engineering application. Applied Mechanics and Materials. 2017. Vol. 863. pp. 334–341.

12. Slastunov S. V., Mazanik E. V., Sadov A. P., Khautiev A. M.-B. Testing of integrated degasifying treatment technology based on hydraulic splitting of coal seam using surface holes. GIAB. 2020. No. 2. pp. 58–70.
13. Meshkov A. A., Sadov A. P., Komissarov I. A., Khautiev A. M.-B., Slastunov S. V. Experimental hydraulic dissociation of Boldyrev seam coal using access boreholes in Kirov mine. GIAB. 2020. No. 11. pp. 37–45.
14. Kai Wang, Guodong Zhang, Yanhai Wang, Xiang Zhang, Kangnan Li et al. Simulation Study on the Effect of Coal Seam Hydraulic Fracturing to Increase Permeability. 2021. Available at: (accessed: 15.08.2023).

Language of full-text russian
Full content Buy