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...
محفوظ في:
| المؤلفون الرئيسيون: | , , , , , |
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| التنسيق: | Artigo |
| اللغة: | Chinês |
| منشور في: |
Editorial Office of Safety in Coal Mines
2026-03-01
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| سلاسل: | Meikuang Anquan |
| الموضوعات: | |
| الوصول للمادة أونلاين: | https://www.mkaqzz.com/cn/article/doi/10.13347/j.cnki.mkaq.20250252 |
| الوسوم: |
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