Key technology for rapidly drilling large-diameter destressing drillhole in rockburst coal seam

WEI Hongchao1,2 WANG Yi2 WANG Bo2

(1.China Coal Research Institute, Beijing 100013)
(2.Xi’an Research Institute Co., Ltd., China Coal Technology and Engineering Group Corp., Shaanxi Xi’an 710077)

【Abstract】In order to improve the hole forming rate and construction efficiency of large-diameter destressing drillhole in rockburst mine, based on the analysis of the stress characteristics of coal rock in a rockburst coal mine, the dynamic instability characteristics of destressing drillhole, and the construction features, this paper proposed the key points for drilling large-diameter destressing drillhole, the efficient discharge of cuttings and fast drilling/lifting. Combined with the discharge of cuttings method by dual-power, this paper formed the technology and equipment for rapidly drilling large-diameter destressing drillhole in rockburst coal seam finally after the design and optimization of key equipment, drilling tools, technology and drilling processes. With the equipment based on the ZDY4000LR rig and the technology including water medium and spiral wide-wing drilling pipe, the drillholes were drilled safely and efficiently. And the method was proved and used at the Henan Yima and Shaanxi Binchang coalfields. The tests show that the large-diameter destressing drillhole could be constructed efficiently and safely, and the efficiency is increased by 48.9% compared with high- and thin-helical-blade drilling-pipe drilling method. The hole forming rate reached 100%, and the method has high application value and popularization significance. And this method can be used for reference in drilling destressing drillhole in similar coal mines.

【Keywords】 rockburst; destressing drillhole; ZDY4000LR rig; discharge of cuttings method by mix-power; Henan Yima coalfield; Shaanxi Binchang coalfield;


【Funds】 National Science and Technology Major Project of China (2016ZX05045-003-002) Science and Technology Innovation Fund of Xi’an Research Institute Co., Ltd., China Coal Technology and Engineering Group Corp. (2016XAYMS23)

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(Translated by WU J)


    [1] PAN Junfeng. Theory of rockburst start-up and its complete technology system [J]. Journal of China Coal Society, 2019, 44 (1): 173–182 (in Chinese).

    [2] QI Qingxin, LI Yizhe, ZHAO Shankun, et al. Seventy years development of coal mine rockburst in China: Establishment and consideration of theory and technology system [J]. Coal Science and Technology, 2019, 47 (9): 1–40 (in Chinese).

    [3] MA Binwen. Research of boreholes relief pressure prevention and control rockburst [D]. Beijing: China Coal Research Institute, 2018 (in Chinese).

    [4] JIA Chuanyang, JIANG Yujing, ZHANG Xuepeng, et al. Laboratory and numerical experiments on pressure relief mechanism of large-diameter boreholes [J]. Chinese Journal of Geotechnical Engineering, 2017, 39 (6): 1115–1122 (in Chinese).

    [5] MA Binwen, DENG Zhigang, ZHAO Shankun, et al. Study on factors affected and the pressure relief mechanism of control rockburst in boreholes [J/OL]. Coal Science and Technology (in Chinese),

    [6] ZHU Sitao, JIANG Fuxing, SHI Xianfeng, et al. Energy dissipation index method for determining rockburst prevention drilling parameters [J]. Rock and Soil Mechanics, 2015, 36 (8): 2270–2276 (in Chinese).

    [7] WANG Shuwen, PAN Junfeng, LIU Shaohong, et al. Evaluation method for rockburst-preventing effects by drilling based on energy-dissipating rate [J]. Journal of China Coal Society, 2016, 41 (S2): 297–304 (in Chinese).

    [8] YI Enbing, MOU Zonglong, DOU Linming, et al. Study on comparison and analysis of pressure releasing effect of boreholes in soft and hard seam [J]. Coal Science and Technology, 2011, 39 (6): 1–5 (in Chinese).

    [9] LIU Honggang, HE Yongnian, XU Jinhai, et al. Numerical simulation and industrial test of boreholes destressing technology in deep coal tunnel [J]. Journal of China Coal Society, 2007, 32 (1): 33–37 (in Chinese).

    [10] LAN Yongwei, LIU Pengcheng, LI Wei, et al. The influencing factors of drillhole pressure relief and the regression analysis of destroy radius [J]. Safety in Coal Mines, 2013, 44 (4): 24–26 (in Chinese).

    [11] HUANG Qingxiang, GAO Zhaoning. Mechanical model of fracture and damage of coal bump in the entry [J]. Journal of China Coal Society, 2001, 26 (2): 156–159 (in Chinese).

    [12] QI Qingxin, SHI Yuanwei, LIU Tianquan. Experimental study on the mechanism of stick slip instability of rockburst [J]. Journal of China Coal Society, 1997, 22 (2): 144–148 (in Chinese).

    [13] WANG Zhikang. Control effect of mechanical properties on borehole pressure relief in coal seam [D]. Xuzhou: China University of Mining and Technology, 2016 (in Chinese).

    [14] WEI Hongchao. Technology and equipment of large diameter borehole construction applied to prevent and control pressure bump in coal mine [J]. Coal Science and Technology, 2017, 45 (10): 140–143 (in Chinese).

    [15] WEI Hongchao. Application of double-power cuttings removal in pressure-relief borehole construction [J]. Coal Engineering, 2017, 49 (3): 44–46 (in Chinese).

    [16] WANG Junhui, SHI Haisheng. Test and research on construction technology of large diameter pressure relief drilling [J]. Coal Technology, 2017, 36 (7): 100–101 (in Chinese).

    [17] JIA Mingqun, WANG Yi, WANG Li, et al. Application of composite convey drilling cutting technology in soft and outburst seam [J]. Exploration Engineering (Rock & Soil Drilling and Tunneling), 2010, 37 (4): 23–26 (in Chinese).

    [18] WANG Chao. Effect analysis of rock burst prevention and study on infusibility judging for coal seam water infusion [J]. Coal Engineering, 2018, 50 (1): 92–95 (in Chinese).

This Article


CN: 61-1155/P

Vol 48, No. 02, Pages 20-24

April 2020


Article Outline


  • 1 Stress characteristics of coal rock mass in the excavation roadway of rockburst mine
  • 2 Dynamic instability characteristics and process of destressing-drillhole wall disturbance
  • 3 Key technology
  • 4 Equipment and supporting
  • 5 Applications
  • 6 Conclusions
  • References