Bangxin drilling rig
Hard Rock Drilling: Depth-Based Selection
Depth selection strategies guide hard rock bit choices effectively.
Shallow granite (0-50m) with high weathering needs surface-set diamond bits. Large diamonds crush weathered layers quickly.
Mid-deep intact granite (50-150m) requires impregnated diamond bits. Fine, even diamonds handle high strength.
Tips for depth-specific hard rock bits:
- Use wide-blade roller bits in shallow fractured basalt. Reduce vibration via larger contact area.
- Choose high-pressure DTH hammers for deep basalt (>100m). Boost efficiency by 30% vs regular rollers.
- Upgrade bit strength with depth. Ensure safety under high ground stress environments.
Proper depth-based selection optimizes hard rock drilling performance.