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...
Salvato in:
| Autore principale: | |
|---|---|
| Natura: | Artigo |
| Lingua: | Chinês |
| Pubblicazione: |
Editorial Office of Safety in Coal Mines
2020-09-01
|
| Serie: | Meikuang Anquan |
| Soggetti: | |
| Accesso online: | https://www.mkaqzz.com/cn/article/id/7155 |
| Tags: |
Nessun Tag, puoi essere il primo ad aggiungerne!!
|