| Ort der Herkunft |
Jiangsu China (Mainland) |
| Marke |
chenlong |
| Modell-Nummer |
NC46-65(4IF) |
| Geben |
Drill Kragen |
| Maschine Typ |
Bohren Werkzeug |
| Zulassung |
API |
| Material |
Manganhartstahl |
| Verwenden |
Brunnenbohrungen |
Drill collar is mainly used to provide bit weight to drill bit so that drill pipe is in tension.Especially drill collar can keep drill bit centralized and hole track by large rigidity.Drill collar are manufactured strictly by the standard API Spec7-1 and SY/T5411.