Key technologies for drilling with pneumatic PDM drill in underground coal mine rock boreholes

Aiming at the prominent problems encountered in pneumatic directional drilling construction of complex fractured soft coal seams underground coal mines, including encountering dirt bands, low drilling efficiency and frequent failure of positive displacement motor (PDM), this paper conducts research...

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Hlavní autoři:	Hao LI, Ningping YAO, Li WANG, Hongyan CHEN, Jianqiang WANG, Tianzhu CHEN
Médium:	Artigo
Jazyk:	Chinês
Vydáno:	Editorial Office of Safety in Coal Mines 2026-03-01
Edice:	Meikuang Anquan
Témata:	broken soft coal seam directional drilling pre-contour stator pneumatic pdm drill vibration damping sub cooling and lubrication dust fall device
On-line přístup:	https://www.mkaqzz.com/cn/article/doi/10.13347/j.cnki.mkaq.20250252
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