| Ort der Herkunft |
Jiangsu China (Mainland) |
| Marke |
chenlong |
| Geben |
Drill Kragen |
| Maschine Typ |
Bohren Werkzeug |
| Zulassung |
API |
| Material |
Manganhartstahl |
| Verwenden |
Brunnenbohrungen |
Spiral drill collar is used to reduce contact area with hole so as to avoid efficiently bit sticking form differential pressure. Spiral drill collars are manufactured strictly according to the standard of API Spec7-1 and SY/T5144