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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| Formato: | Artigo |
| Lenguaje: | Chinês |
| Publicado: |
Editorial Office of Safety in Coal Mines
2020-09-01
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| Colección: | Meikuang Anquan |
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| Acceso en línea: | https://www.mkaqzz.com/cn/article/id/7155 |
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