Large Diameter and Fast Plug-in Type Spiral Drill Pipe for Drilling Down Screen Pipe Without Lifting
The technology and advantages are introduced about drilling down screen pipe without lifting, and a kind of large-diameter plug-in type spiral drill pipe for the screen pipe without lifting is developed, then the field tests are carried out in Sijiazhuang Coal Mine and Xinjing Coal Mine of Yangquan...
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| Autor principal: | |
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| Formato: | Artigo |
| Idioma: | Chinês |
| Publicado em: |
Editorial Office of Safety in Coal Mines
2020-09-01
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| coleção: | Meikuang Anquan |
| Assuntos: | |
| Acesso em linha: | https://www.mkaqzz.com/cn/article/id/7155 |
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