Foam drilling technology and application for broken soft coal seam in underground coal mine

Authors

JI Qianhui, China Coal Research Institute, Beijing 100013, China; Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi’an 710077, China
DONG Mengmeng, Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi’an 710077, China
LIU Jianlin, Xi’an Research Institute Co. Ltd.,China Coal Technology and Engineering Group Corp., Xi’an 710077, China
SHI Lei

Abstract

Aiming at the limitation of middle pressure air drilling for gas drainage in soft and broken coal seam, such as limited drill cutting removal capacity, and dust pollution, foam drilling technique research in underground coal mines was carried out. CFD simulation of the flow field during the drilling process was conducted to obtain the optimized drilling tool structure parameters for efficient drill cutting transportation. Optimal structural parameters of wide-blade milled auger drill rod with the number of heads 3, the groove width 26 mm, and the pitch 110 mm were determined. A foam perfusion system suitable for underground coal mining was developed. Field test applications show that foam drilling technique and assorted wide-blade milled auger drill rods have high efficiency of cutting transportation. Rotatory resistance was reduced in a range of 42%-48%. The technique can improve drilling depth in soft and broken coal seam and provide a reference for similar deep coal mine drilling construction.

Keywords

foam drilling, gas drainage, efficient drilling cutting removal, auger drill rod

DOI

10.3969/j.issn.1001-1986.2020.02.005

Recommended Citation

JI Qianhui, DONG Mengmeng, LIU Jianlin, et al. (2020) "Foam drilling technology and application for broken soft coal seam in underground coal mine," Coal Geology & Exploration: Vol. 48: Iss. 2, Article 6.
DOI: 10.3969/j.issn.1001-1986.2020.02.005
Available at: https://cge.researchcommons.org/journal/vol48/iss2/6

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