Abstract
In order to determine the coal stress along the hole depth during coal seam drilling process, the response of several drilling parameters under different stress states of coal was studied through finite element numerical simulation software, and the method for measuring the coal stress by monitoring the torque, thrust, rotation speed, and drilling speed of the bit during drilling was suggested. Through the establishment of a three-dimensional numerical simulation model of the dynamic coal breaking by the bit, the drilling process of coal under different coal stress conditions is analyzed and discussed from the two working conditions including controlling drilling speed, rotation speed, and controlling thrust and torque. The results show that the process of pressure drilling displays skip drilling, and the torque, thrust, rotation speed, and drilling speed all fluctuate reciprocally. By comparing the simulation results and experimental results of the relationship between coal stress and torque, it is found that the torque values of simulation and experiment demonstrate the same trend as coal stress. The maximum deviation of the comparison results is 16.3%, and the minimum deviation is 2.9%, which prove that the three-dimensional drilling model and the fitting function between coal stress and drilling parameters are reliable. The fitting relationship between drilling parameters and coal stress shows that the torque and thrust of the bit increase linearly with the increase of coal stress, while the rotation speed and drilling speed decrease linearly with the increase of coal stress. When the drilling parameters are used to measure the stress of coal, there is a positive correlation between torque and thrust, rotation speed, and drilling speed with great consistency. The results provide a reference for the evaluation and study of high stress coal during drilling.
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Funding
The authors would like to acknowledge the financial support by the Major Program of Shandong Provincial Natural Science Foundation (Grant no. ZR2019ZD13) and the Major Scientific and Technological Innovation Project of Shandong Provincial Key Research Development Program (Grant no. 2019SDZY02), and the Project supported by State Key Laboratory of Water Resource Protection and Utilization in Coal Mining (No. SHGF-16-25).
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Communicated by Murat Karakus
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Zheng, Y., Zhao, Z., Wu, W. et al. Numerical simulation study on measuring coal stress by drilling parameters. Arab J Geosci 14, 2110 (2021). https://doi.org/10.1007/s12517-021-08495-0
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DOI: https://doi.org/10.1007/s12517-021-08495-0