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Effect of Slot Inclination Angle and Borehole-Slot Ratio on Mechanical Property of Pre-cracked Coal: Implications for ECBM Recovery Using Hydraulic Slotting

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Abstract

Low permeability is the main constraint on the high-efficiency coalbed methane recovery in deep coal seams. Hydraulic slotting has been proved to be a favorable method to stimulate low-permeability coal seams. In this paper, the coal samples with various slot inclination angles and borehole-slot ratios were used to investigate the weakening effect of slot inclination angle and borehole-slot ratio on the mechanical property of the pre-cracked coal. Besides, the crack patterns of the slotted coal specimens were identified to reveal the slot weakening mechanism. It is revealed that the variations in compression strength, elastic modulus and Poisson’s ratio with the slot inclination angle generally conform to a Boltzmann function, logistic function and quadratic function, respectively. With the increase in the borehole-slot ratio, the curve clusters of compression strength and elastic modulus show the horizontal “V” with left opening, and the curve clusters of Poisson’s ratio show the trend of rapid increase after slow increase. Compared with elastic modulus, the slot weakening degrees of compression strength and Poisson’s ratio are more significant. Moreover, the tensile and shear cracks mainly appear in the coal samples with small and large slot inclination angles, respectively, which verify the fact that the slot weakening effect on mechanical property of the slotted coal samples with small slot inclination angles is more significant. The research achievements are attributed to the improvement in the efficiency of the hydraulic slotting-based enhanced coalbed methane recovery.

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Acknowledgments

This work is financially supported by the State Key Research Development Program of China (2017YFC0804206), National Natural Science Foundation of China (51704046 and 51604154), the Fundamental Research Funds for the Central Universities (2018CDQYZH0001 and 3142019005), the Open Fund Research Project of State Key Laboratory Breeding Base for Mining Disaster Prevention and Control (MDPC201710) and National Science and Technology Major Project of China (2016ZX05067-005), which are gratefully acknowledged.

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Authors and Affiliations

  1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, School of Resources and Safety Engineering, Chongqing University, Chongqing, 400044, China

    Quanle Zou, Han Liu & Tiancheng Zhang

  2. Safety Engineering Center, North China University of Science and Technology, Beijing, 101601, China

    Zhiheng Cheng

  3. State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao, 266590, China

    Quanle Zou

  4. School of Safety Engineering, China University of Mining and Technology, Xuzhou, 221116, China

    Baiquan Lin

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  1. Quanle Zou
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Correspondence to Quanle Zou.

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Zou, Q., Liu, H., Cheng, Z. et al. Effect of Slot Inclination Angle and Borehole-Slot Ratio on Mechanical Property of Pre-cracked Coal: Implications for ECBM Recovery Using Hydraulic Slotting. Nat Resour Res 29, 1705–1729 (2020). https://doi.org/10.1007/s11053-019-09544-y

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