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Energies
Volume 15
Issue 12
10.3390/en15124252
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Article

Research on Directional Controllability of Cracking in Hydraulic Fracturing of Hard Overburden Based on Local Stress Field Intervention

by
Dingchao Chen
1,
Xiangyu Wang
1,*,
Feiteng Zhang
1,
Menglong Li
1,
Xiangqian Zhao
1,
Guanjun Li
1,
Yang Yu
2,
Guanghui Wang
1,
Jiaxin Zhao
1 and
Xiangdong Wang
1
1
School of Mines, China University of Mining & Technology, Xuzhou 221116, China
2
College of Civil Engineering, Xuzhou University of Technology, Xuzhou 221111, China
*
Author to whom correspondence should be addressed.
Energies 2022, 15(12), 4252; https://doi.org/10.3390/en15124252
Submission received: 5 May 2022 / Revised: 5 June 2022 / Accepted: 6 June 2022 / Published: 9 June 2022
(This article belongs to the Special Issue Coal Conversion Processes)
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Abstract

As a widely-used method of digging roadways in China, gob-side entry driving features specific advantages, such as a high recovery rate and good isolation effects. However, under the condition of hard overburden, the excessive bearing pressure of small coal pillars will easily cause serious internal damage in the coal and the run-through of the plastic zone, leading to harmful gas leakage in the goaf. Therefore, based on the engineering background of small coal pillars in the 18506 working face of Xiqu Coal Mine, this paper comprehensively adopts theoretical analysis, numerical simulation, industrial tests, and other methods, analyzes the evolution mechanism of isolated bearing and plastic fracture areas of small coal pillar under hard overburden, studies the influence law of hard overburden cutting parameters on the isolation and stability of small coal pillars, and puts forward the technology of actively cutting the top to weaken the stress concentration of coal pillars under hard overburden. With the reasonable cutting parameters determined, the controllable mechanism of hydraulic fracturing cutting under hard overburden further revealed, and the hydraulic fracturing cutting technology with “controllable cutting orientation of hydraulic fracturing with local stress field intervention” formed as the basic core, the stress situation on the roof is improved, realizing the stability control of the coal pillars for the roadway protection, and avoiding gas leakage and other disasters caused by small coal pillar destruction.
Keywords: hard overburden; directional hydraulic fracturing; pressure relief mechanism; roadway coal pillar; gob-side entry hard overburden; directional hydraulic fracturing; pressure relief mechanism; roadway coal pillar; gob-side entry

Share and Cite

MDPI and ACS Style

Chen, D.; Wang, X.; Zhang, F.; Li, M.; Zhao, X.; Li, G.; Yu, Y.; Wang, G.; Zhao, J.; Wang, X. Research on Directional Controllability of Cracking in Hydraulic Fracturing of Hard Overburden Based on Local Stress Field Intervention. Energies 2022, 15, 4252. https://doi.org/10.3390/en15124252

AMA Style

Chen D, Wang X, Zhang F, Li M, Zhao X, Li G, Yu Y, Wang G, Zhao J, Wang X. Research on Directional Controllability of Cracking in Hydraulic Fracturing of Hard Overburden Based on Local Stress Field Intervention. Energies. 2022; 15(12):4252. https://doi.org/10.3390/en15124252

Chicago/Turabian Style

Chen, Dingchao, Xiangyu Wang, Feiteng Zhang, Menglong Li, Xiangqian Zhao, Guanjun Li, Yang Yu, Guanghui Wang, Jiaxin Zhao, and Xiangdong Wang. 2022. "Research on Directional Controllability of Cracking in Hydraulic Fracturing of Hard Overburden Based on Local Stress Field Intervention" Energies 15, no. 12: 4252. https://doi.org/10.3390/en15124252

APA Style

Chen, D., Wang, X., Zhang, F., Li, M., Zhao, X., Li, G., Yu, Y., Wang, G., Zhao, J., & Wang, X. (2022). Research on Directional Controllability of Cracking in Hydraulic Fracturing of Hard Overburden Based on Local Stress Field Intervention. Energies, 15(12), 4252. https://doi.org/10.3390/en15124252

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