Quality Control of Great Rock Reamer II

Hybrid drill bit conventional PDC and roller-cone bits. It is saving cost, Improves Drilling Efficiency.

This type of Bi-center bit mainly used for medium to medium hard compressive and abrasive formation.

Core barrel with roller bit is used in very strong rock formations(compressive strength > 100Mpa)

Raise Boring Cutters OverviewThe raise boring cutters is mainly used for the construction of vertical shafts, ventilation shafts inclined shafts, pressure regulating shafts and escape shafts , and it...